Amplifier Controlled Patents (Class 455/194.2)
  • Patent number: 10313893
    Abstract: Provided herein are apparatus and methods for radio frequency (RF) signal boosters. In certain implementations, a multi-band signal booster is provided for boosting the uplink and downlink channels of at least a first frequency band and a second frequency band. In certain configurations, the downlink channels of the first and second channels are adjacent, and the signal booster includes a first amplification path for boosting the uplink channel of the first frequency band, a second amplification path for boosting the uplink channel of the second frequency band, and a third amplification path for boosting both downlink channels of the first and second frequency bands.
    Type: Grant
    Filed: March 30, 2018
    Date of Patent: June 4, 2019
    Assignee: CELLPHONE-MATE, INC.
    Inventor: Hongtao Zhan
  • Patent number: 9936396
    Abstract: Provided herein are apparatus and methods for radio frequency (RF) signal boosters. In certain implementations, a multi-band signal booster is provided for boosting the uplink and downlink channels of at least a first frequency band and a second frequency band. In certain configurations, the downlink channels of the first and second channels are adjacent, and the signal booster includes a first amplification path for boosting the uplink channel of the first frequency band, a second amplification path for boosting the uplink channel of the second frequency band, and a third amplification path for boosting both downlink channels of the first and second frequency bands.
    Type: Grant
    Filed: June 3, 2016
    Date of Patent: April 3, 2018
    Assignee: CELLPHONE-MATE, INC.
    Inventor: Hongtao Zhan
  • Patent number: 9571885
    Abstract: One or more circuits may comprise at least one first-type analog-to-digital converter (ADC) and at least one second-type ADC. The circuit(s) may be operable to receive a plurality of signals, each of which may comprise a plurality of channels. The circuit(s) may be operable to digitize a selected one or more of the channels. Which, if any, of the selected channels are digitized via the at least one first-type ADC and which, if any, of the selected channels are digitized via the at least one second-type ADC, may be based on which of the plurality of channels are the selected channels and/or based on power consumption of the circuit(s). A bandwidth of each first-type ADC may be on the order of the bandwidth of one of the received signals. A bandwidth of each second-type ADC may be on the order of the bandwidth of one of the plurality of channels.
    Type: Grant
    Filed: May 22, 2015
    Date of Patent: February 14, 2017
    Assignee: MAXLINEAR, INC.
    Inventor: Curtis Ling
  • Patent number: 9402190
    Abstract: Provided herein are apparatus and methods for radio frequency (RF) signal boosters. In certain implementations, a multi-band signal booster is provided for boosting the uplink and downlink channels of at least a first frequency band and a second frequency band. In certain configurations, the downlink channels of the first and second channels are adjacent, and the signal booster includes a first amplification path for boosting the uplink channel of the first frequency band, a second amplification path for boosting the uplink channel of the second frequency band, and a third amplification path for boosting both downlink channels of the first and second frequency bands.
    Type: Grant
    Filed: January 15, 2016
    Date of Patent: July 26, 2016
    Assignee: CELLPHONE-MATE, INC.
    Inventor: Hongtao Zhan
  • Patent number: 9363682
    Abstract: Provided herein are apparatus and methods for radio frequency (RF) signal boosters. In certain implementations, a multi-band signal booster is provided for boosting the uplink and downlink channels of at least a first frequency band and a second frequency band. In certain configurations, the downlink channels of the first and second channels are adjacent, and the signal booster includes a first amplification path for boosting the uplink channel of the first frequency band, a second amplification path for boosting the uplink channel of the second frequency band, and a third amplification path for boosting both downlink channels of the first and second frequency bands.
    Type: Grant
    Filed: January 15, 2016
    Date of Patent: June 7, 2016
    Assignee: CELLPHONE-MATE, INC.
    Inventor: Hongtao Zhan
  • Patent number: 9100839
    Abstract: Provided herein are apparatus and methods for radio frequency (RF) signal boosters. In certain implementations, a multi-band signal booster is provided for boosting the uplink and downlink channels of at least a first frequency band and a second frequency band. In certain configurations, the downlink channels of the first and second channels are adjacent, and the signal booster includes a first amplification path for boosting the uplink channel of the first frequency band, a second amplification path for boosting the uplink channel of the second frequency band, and a third amplification path for boosting both downlink channels of the first and second frequency bands.
    Type: Grant
    Filed: September 22, 2014
    Date of Patent: August 4, 2015
    Assignee: CELLPHONE-MATE, INC.
    Inventor: Hongtao Zhan
  • Patent number: 8856857
    Abstract: This technique relates to a receiving device, a receiving method, and a program that can demodulate transmitted signals with high accuracy. A receiving device of this disclosure includes: an amplifying unit that amplifies a received signal; an adjusting unit that adjusts gain of the amplifying unit in accordance with power of the signal; a demodulating unit that demodulates the amplified signal; and a detecting unit that detects an interval from the signal, information having the same content continuously appearing in the interval. The adjusting unit restricts the process of adjusting the gain of the amplifying unit in accordance with a result of the detection of the interval. This disclosure can be applied to receiving devices that receive broadcast signals compliant with DVB-C2 via a CATV network.
    Type: Grant
    Filed: March 23, 2012
    Date of Patent: October 7, 2014
    Assignee: Sony Corporation
    Inventors: Kenichi Kobayashi, Naoki Yoshimochi
  • Patent number: 8666337
    Abstract: A system for power amplifier control saturation detection and correction includes a comparator configured to receive a power control signal and a detected power signal and generate a regulated voltage, a power amplifier configured to receive the regulated voltage and develop an output power, a power detector configured to sense the output power and develop the detected power signal, a saturation detector configured to receive the regulated voltage and a system voltage and determine whether the power amplifier is operating in a saturation mode during a transmit burst, and a current generator configured to reduce the power control signal when the power control signal exceeds a predetermined value and after expiration of a predetermined period of time, preventing the power control signal from exceeding the detected power signal.
    Type: Grant
    Filed: March 3, 2011
    Date of Patent: March 4, 2014
    Assignee: Skyworks Solutions, Inc.
    Inventors: David S. Ripley, Paul R. Andrys, Matthew L. Banowetz
  • Patent number: 8634792
    Abstract: An RF receiver section includes an adjustable antenna assembly, a low noise amplifier module, and a down conversion module. The adjustable antenna assembly is configured to provide a first receive antenna structure and a second receive antenna structure. The first and second receive antenna structures receive an inbound wide bandwidth RF signal that includes an interferer RF signal component and a desired inbound RF signal component. The effective polarization of at least one of the first and second receive antenna structures is adjusted to reduce signal strength of the interferer RF signal component.
    Type: Grant
    Filed: June 28, 2013
    Date of Patent: January 21, 2014
    Assignee: Broadcom Corporation
    Inventors: Ahmadreza (Reza) Rofougaran, Maryam Rofougaran
  • Patent number: 8576133
    Abstract: An RF receiver section includes an adjustable antenna assembly, a low noise amplifier module, and a down conversion module. The adjustable antenna assembly is configured to provide a first receive antenna structure and a second receive antenna structure. The first and second receive antenna structures receive an inbound wide bandwidth RF signal that includes an interferer RF signal component and a desired inbound RF signal component. The effective polarization of at least one of the first and second receive antenna structures is adjusted to reduce signal strength of the interferer RF signal component.
    Type: Grant
    Filed: June 22, 2007
    Date of Patent: November 5, 2013
    Assignee: Broadcom Corporation
    Inventors: Ahmadreza Reza Rofougaran, Maryam Rofougaran
  • Patent number: 8548414
    Abstract: The invention discloses a circuit and a method for reducing radio frequency power consumption of mobile phone, wherein a baseband processing chip (21) adjusts a base bias voltage and/or a collector bias voltage of a radio frequency power amplifier (23) according to radio frequency power output of the radio frequency power amplifier (23). Since the invention reduces the radio frequency output power of the radio frequency power amplifier (23) by moderately reducing the base bias voltage and/or the collector bias voltage at the same time when it is ensured that the mobile phone communicates with a base station normally and the linear index and the Adjacent Channel Power Ratio (ACPR) of the radio frequency power amplifier (23) meet the requirements of the specification, thus the efficiency of the radio frequency power amplifier can be improved, the battery energy is saved and the heating problem of the mobile phone is relieved.
    Type: Grant
    Filed: July 5, 2010
    Date of Patent: October 1, 2013
    Assignee: ZTE Corporation
    Inventor: Shouyan Chen
  • Patent number: 8422977
    Abstract: The invention relates to a programmable filter for a radiofrequency receiver, embodiments disclosed including a filter (600) comprising an input (601) for receiving a radiofrequency signal, an output (602) for providing a filtered version of the input radiofrequency signal and a plurality of filter paths (603a-c) connected in parallel between the input (601) and output (602), each filter path comprising a buffer (604a-c) connected between the input (601) and one or more polyphase filters (605a-f), wherein each of the plurality of filter paths (603a-c) is configured to be individually selectable by providing an enable signal to a corresponding one of the buffers (604a-c).
    Type: Grant
    Filed: May 27, 2011
    Date of Patent: April 16, 2013
    Assignee: NXP B.V.
    Inventor: Sebastien Robert
  • Patent number: 8260225
    Abstract: A power amplifier controller circuit controls a power amplifier based upon an amplitude correction signal indicating the amplitude difference between the amplitude of the input signal and an attenuated amplitude of the output signal. The power amplifier controller circuit comprises an amplitude control loop and a phase control loop. The amplitude control loop adjusts the supply voltage to the power amplifier based upon the amplitude correction signal. The amplitude correction signal may also be split into two or more signals with different frequency ranges and provided respectively to different types of power supplies with different efficiencies to generate the adjusted supply voltage to the power amplifier. The phase control loop adjusts the phase of the input signal based upon a phase error signal indicating a phase difference between phases of the input signal and the output signal to reduce phase distortion generated by the power amplifier.
    Type: Grant
    Filed: April 8, 2011
    Date of Patent: September 4, 2012
    Assignee: Quantance, Inc.
    Inventors: Vikas Vinayak, Serge Francois Drogi
  • Patent number: 8063997
    Abstract: An integrated tuner is programmable to optimize its components for either analog signal reception or digital signal reception. Power to the components is increased for analog operation and decreased for digital operation. The tuner also includes a selectable and integrated low noise amplifier that may be selected for single-signal reception and bypassed for multi-signal reception.
    Type: Grant
    Filed: August 5, 2008
    Date of Patent: November 22, 2011
    Assignee: NXP B.V.
    Inventors: Mats Lindstrom, Glenn W. Eswein, Abdolreza Shafie, Mike A. Ploof, Ryuji Maeda, Manjit S. Gill, Eileen Carlson, Anthony R. Simon, Henry S. Lau
  • Patent number: 8023911
    Abstract: An amplifying device has an amplifier which amplifies an input signal supplied from an input terminal and outputs the amplified input signal, a feedback loop which has at least one of a resistive element and a capacitance connected between an output terminal of the amplifier and the input terminal, a variable current unit which adjusts a current value in accordance with a controlling signal and supplies an operating current to the amplifier, a signal analyzing unit which generates a time difference signal having a value corresponding to a slew rate of the input signal and outputs the time difference signal, and a controlling unit which generates the controlling signal in accordance with the time difference signal and outputs the controlling signal.
    Type: Grant
    Filed: November 14, 2008
    Date of Patent: September 20, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Daisuke Miyashita
  • Patent number: 8000756
    Abstract: The present invention provides a receiver having low power consumption and method thereof. The receiver with low power consumption adjusts the gain based on the automatic gain control information. The receiver acquires the signal peaks both after and before a channel selection filter and further analyzes the wanted signal and interference signal with respect to the signal peaks. The receiver determines the magnitude of the wanted signal and determines whether the interference signal exists. The receiver provides the signals with optimal current correspondingly in order to effectively decrease the power consumption of the receiver.
    Type: Grant
    Filed: February 12, 2009
    Date of Patent: August 16, 2011
    Assignee: Silicon Motion, Inc.
    Inventors: Sung-ho Beck, Sung-hyuk Lee, Myung-woon Hwang
  • Patent number: 7983649
    Abstract: A RF device such as a tower mounted amplifier (TMA), mast-head amplifier (MHA), or Tower Mounted Boosters (TMB) includes a housing having a plurality of cavities and an input and an output, the input being coupled to the antenna and the output being coupled to a base station. The housing includes a transmission path holding multiple coaxial resonators. The housing further includes multiple receive paths including at least one path having a plurality of cavities, each cavity containing a dielectric resonator. The metallic transmit resonator nearest the antenna input is coupled to the first dielectric resonator via a common resonant wire. The last dielectric resonator in the receive path is coupled to a first metallic resonator of a downstream clean-up filter via another common resonant wire.
    Type: Grant
    Filed: April 30, 2010
    Date of Patent: July 19, 2011
    Assignee: Antone Wireless Corporation
    Inventors: Michael M. Eddy, Gregory L. Hey-Shipton
  • Patent number: 7949322
    Abstract: This disclosure is directed to a frequency-selective low noise amplifier (LNA) with wide-band impedance and noise matching. The LNAS may include a closed loop circuit that supports wideband input matching. For example, the closed loop circuit may be configure to impedance match an input signal and provide a low noise figure. In addition, the LNA may include an open loop circuit that amplifies the input signal and provides a high output impedance. The open loop circuit may further include a selectivity filter that filters out frequencies outside a desired frequency band. The LNA may drive a tunable band-pass filter via the open loop circuit.
    Type: Grant
    Filed: March 9, 2007
    Date of Patent: May 24, 2011
    Assignee: QUALCOMM, Incorporated
    Inventors: Tae Wook Kim, Kenneth Charles Barnett
  • Patent number: 7783272
    Abstract: A broadband signal amplifier includes one of more broadband amplifier circuits, each dynamically controlled in response to a total power level of signals applied thereto to reduce linearity in response to a reduction of input signal strength. A filter may couple the output of the broadband amplifier circuits to each other to form a tandem arrangement. Power detectors are connected to detect and provide outputs indicative of the total power levels of the signals applied to respective broadband amplifiers. A control unit is connected to and receives the output from the power detectors and, in response, provides a control signals to the broadband amplifier circuit so as to operate each over portions of their operating characteristic curves that provide only that degree of linearity necessary to limit distortion to a predetermined or dynamically adjustable maximum acceptable level.
    Type: Grant
    Filed: June 29, 2006
    Date of Patent: August 24, 2010
    Assignee: Microtune (Texas), L.P.
    Inventor: Timothy M. Magnusen
  • Patent number: 7747231
    Abstract: A system and method for transmitting a signal in a communication system are provided. In the signal transmitting method, a multi-FA signal is generated by combining single FA signals to be transmitted by N FAs. An operation mode is determined for N MMPAs according to a used FA strategy and adjustment of amplification characteristics of the N MMPAs is controlled according to the operation mode. The power of the multi-FA signal is divided by N, the N divided signals are amplified according to the adjusted amplification characteristics, and the power of the amplified N signals is combined.
    Type: Grant
    Filed: June 29, 2006
    Date of Patent: June 29, 2010
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Hyun-Su Yoon, Joong-Ho Jeong
  • Patent number: 7738853
    Abstract: A RF device such as a tower mounted amplifier (TMA), mast-head amplifier (MHA), or Tower Mounted Boosters (TMB) includes a housing having a plurality of cavities and an input and an output, the input being coupled to the antenna and the output being coupled to a base station. The housing includes a transmission path holding multiple coaxial resonators. The housing further includes multiple receive paths including at least one path having a plurality of cavities, each cavity containing a dielectric resonator. The metallic transmit resonator nearest the antenna input is coupled to the first dielectric resonator via a common resonant wire. The last dielectric resonator in the receive path is coupled to a first metallic resonator of a downstream clean-up filter via another common resonant wire.
    Type: Grant
    Filed: April 30, 2007
    Date of Patent: June 15, 2010
    Assignee: Antone Wireless Corporation
    Inventors: Michael M. Eddy, Gregory L. Hey-Shipton
  • Patent number: 7702295
    Abstract: Systems and methods are disclosed for an electronically adjustable signal filter system, which comprises, in some embodiments, a first filter coupled to an antenna coupling network and a second filter, a power amplifier coupled to the first filter, an antenna connected to an antenna coupling network, a pilot tone generator coupled to the first filter, and a first signal source connected to the power amplifier and first filter. In some embodiments, the power amplifier amplifies the first signal, the first filter places a notch into the first signal transmitted to the antenna coupling network, the antenna coupling network combines the first signal and a second signal received from the antenna and transmits a third signal to the second filter.
    Type: Grant
    Filed: December 22, 2006
    Date of Patent: April 20, 2010
    Assignee: Nortel Networks Limited
    Inventors: Charles Nicholls, Alain Roussel
  • Patent number: 7684760
    Abstract: An apparatus for controlling transmission power of a mobile communication terminal. The apparatus comprises a central processing unit for measuring a power level of a received signal and determining a power amplification mode in response to the measured power level of the received signal and a power preset table, a driver amplifier for amplifying a transmission signal to produce an output signal, the driver amplifier has operating conditions chosen in accordance with the power amplification mode, a voltage converter for outputting a preset voltage value in accordance with the power amplification mode, and a power amplifier for amplifying the output signal of the driver amplifier in response to the outputted preset voltage value.
    Type: Grant
    Filed: February 11, 2005
    Date of Patent: March 23, 2010
    Assignee: LG Electronics Inc.
    Inventor: Soon-Hyeok Kwak
  • Patent number: 7668526
    Abstract: A frequency mixer includes a semiconductor substrate. An input current feedback amplifier is formed on the semiconductor substrate and receives a radio frequency (RF) signal and a local oscillator (LO) signal. An inverting current feedback amplifier is formed on the semiconductor substrate and connected to the input current feedback amplifier for inverting the LO signal and producing a half-wave signal. An output current feedback amplifier is formed on the semiconductor substrate and connected to an output of the input and inverting current feedback amplifiers and operative as an inverting summer for the RF and LO signals such that the output polarity of the RF signal is reversed.
    Type: Grant
    Filed: January 16, 2007
    Date of Patent: February 23, 2010
    Assignee: Harris Corporation
    Inventors: Edward R. Beadle, Roy Vaninetti, John F. Dishman
  • Patent number: 7650133
    Abstract: Switching characteristics in an SPDT switch are improved to reduce the rise delay in a low power slot following after a high power slot. Control terminals of an SPDT switch are respectively provided with backflow prevention circuits. The backflow prevention circuit is configured to have two transistors and a diode. In a transmission mode, for example, when a time slot where a high power passes through transistors is followed by a time slot where a low power passes through, the electric charges accumulated in the gates of the transistors are blocked. In the case where the transistors are in the OFF state, the electric charges accumulated in the gates of the transistors are immediately discharged to allow the transistors to be completely turned OFF.
    Type: Grant
    Filed: August 29, 2006
    Date of Patent: January 19, 2010
    Assignee: Renesas Technology Corp.
    Inventors: Toshihiro Miura, Hitoshi Akamine, Yasushi Shigeno, Akishige Nakajima, Masahiro Tsuchiya
  • Patent number: 7650134
    Abstract: In a SPDT switch, a resistor for leak path is connected between a terminal for antenna and a reference potential. The resistor for leak path allows charge capacitances accumulated in electrostatic capacitor elements provided as DC cut capacitors connected to transmission signal terminals and reception signal terminals to be discharged and allows rapid lowering of a potential at the terminal for antenna. In the SPDT switch, a switching characteristic is improved and a delay in the rising edge of a low-power slot which comes after a high-power slot is reduced.
    Type: Grant
    Filed: August 30, 2006
    Date of Patent: January 19, 2010
    Assignee: Renesas Technology Corp.
    Inventors: Akishige Nakajima, Yasushi Shigeno, Takashi Ogawa, Shinya Osakabe, Tomoyuki Ishikawa
  • Patent number: 7570946
    Abstract: The invention relates to a method for determining the strength of a signal (18) at the input of a tuner (1a.) In this, the frequency-dependent amplification characteristic for the tuner is measured and stored in a memory assigned to the tuner. With the help of this characteristic the frequency-dependent variation of the amplification can be compensated during tuner operation, in order that the input signal strength can be deduced more precisely. For a tuner with automatic gain control (AGC), the frequency dependence of the AGC can also be recorded and stored in the memory by representative characteristics. The consideration of the AGC characteristics results in a further improvement to the precision of estimation of the input signal strength.
    Type: Grant
    Filed: November 25, 2002
    Date of Patent: August 4, 2009
    Assignee: NXP B.V.
    Inventor: Hendricus Martinus Van Der Wijst
  • Patent number: 7548741
    Abstract: A power generation system including a RF power generator which provides a RF output power. The power distribution system includes a phase-magnitude detector module having a dual logarithmic amplifier phase-magnitude detector. The dual logarithmic amplifier phase-magnitude detector receives current and voltage signals. The dual logarithmic amplifier phase-magnitude detector generates a phase signal that varies in accordance with the phase between the voltage signal and the current signal and a magnitude signal that varies in accordance with the magnitude between the voltage and current signals. A controller receives the phase and magnitude signal and communicates control signals to the matching network.
    Type: Grant
    Filed: August 29, 2006
    Date of Patent: June 16, 2009
    Assignee: MKS Instruments, Inc.
    Inventor: Richard E. Church
  • Patent number: 7529524
    Abstract: In an aspect of the invention, a method is performed in a transceiver for adaptive power amplifier linearization in time division duplex communication systems. The method comprises, in response to a first condition, performing, using a feedback signal generated by receiving subsystem circuitry, adaptive power amplifier linearization on a signal to be transmitted. The method additionally comprises, in response to a second condition, performing operations in order to determine receive data from a received radio frequency (RF) signal. The operations use at least the receiving subsystem circuitry. In a further aspect of the present invention, a transceiver is disclosed.
    Type: Grant
    Filed: October 26, 2005
    Date of Patent: May 5, 2009
    Assignee: L3 Communications Corporation
    Inventors: Thomas R. Giallorenzi, Michael Rice, William K. McIntire, June Sun
  • Patent number: 7505748
    Abstract: A variable attenuator and method of attenuating a signal is presented. The variable attenuator contains an input that receives an input signal to be attenuated. A voltage divider between a resistor and parallel MOSFETs provides the attenuated input signal. The MOSFETs have different sizes and have gates that are connected to a control signal through different resistances such that the larger the MOSFET, the larger the resistance. The control signal is dependent on the output of the attenuator. The arrangement extends the linearity of the attenuation over a wide voltage range of the control signal and decreases the intermodulation distortion of the attenuator.
    Type: Grant
    Filed: September 28, 2005
    Date of Patent: March 17, 2009
    Assignee: Freescale Semicondductor, Inc.
    Inventors: Daniel P. McCarthy, Lawrence E. Connell, Neal W. Hollenbeck
  • Patent number: 7499677
    Abstract: A low voltage differential signaling transceiver includes a transmitter and a receiver, the transmitter having a first terminal in signal communication with a transmission line, a source resistance in signal communication with the first terminal, a switch in signal communication with the source resistance and in switchable signal communication from ground or an input voltage, a voltage regulator in switchable signal communication with the switch for providing the input voltage to the switch, and a voltage controller in signal communication between the first terminal and the voltage regulator for controlling the input voltage to provide a controlled voltage to a receiver; and the receiver having an amplifier having a first input, a first pad in signal communication with the first input, a load resistance, and a second pad in signal communication with the load resistance, where the first and second pads are both in signal communication with one end of a first transmission line.
    Type: Grant
    Filed: October 6, 2005
    Date of Patent: March 3, 2009
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jae-Suk Yu, Jae-Youl Lee
  • Patent number: 7430405
    Abstract: A gain control circuit has a transmission power amplifier that amplifies a transmission signal to a predetermined level. An adjacent channel leak power ratio monitor finds a ratio of a distortion element corresponding to an adjacent channel leak power to a main element from an output signal supplied from the transmission power amplifier, and outputs the found ratio as an ACPR monitor value. A power supply control section variously controls power supply to the transmission power amplifier with use of the ACPR monitor value supplied from the adjacent channel leak power ratio monitor. A transmission signal level variable section controls a gain of a transmission signal path on the basis of a transmission level monitor value supplied from the adjacent channel leak power ratio monitor, thereby varying a level of the transmission signal.
    Type: Grant
    Filed: September 8, 2005
    Date of Patent: September 30, 2008
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Mikio Hayashihara
  • Patent number: 7414676
    Abstract: An integrated tuner is programmable to optimize its components for either analog signal reception or digital signal reception. Power to the components is increased for analog operation and decreased for digital operation. The tuner also includes a selectable and integrated low noise amplifier that may be selected for single-signal reception and bypassed for multi-signal reception.
    Type: Grant
    Filed: July 31, 2002
    Date of Patent: August 19, 2008
    Assignee: Conexant Systems, Inc.
    Inventors: Mats Lindstrom, Glenn Eswein, Abdolreza Shafie, Mike A. Ploof, Ryuji Maeda, Manjit S. Gill, Eileen Carlson, Anthony R. Simon, Henry S. Lau
  • Patent number: 7412219
    Abstract: A high-frequency amplifier includes first and second amplifying stages disposed in parallel for amplifying VHF/UHF television signals. The first amplifying stage includes a first FET and a second FET of a grounded-gate type connected in series between a common input terminal and a first output terminal to which a VHF-signal selection circuit is connected, and the second amplifying stage includes a third FET and a fourth FET of a grounded-gate type connected in series between the common input terminal and a second output terminal to which a UHF-signal selection circuit is connected. Switching between amplifying operations of the first and second amplifying stages is performed by an operation switching unit selectively setting one of the first and third FETs in a forward-bias state and the other in a reverse-bias state in response to a switching voltage externally set.
    Type: Grant
    Filed: October 27, 2005
    Date of Patent: August 12, 2008
    Assignee: Alps Electric Co., Ltd
    Inventors: Masaki Yamamoto, Masaaki Endo
  • Publication number: 20080081573
    Abstract: Provided is a receiver capable of automatically controlling a gain of the receiver and receiving three or more band signals. A gain controlled receiver includes a low noise amplifier, a first variable gain control amplifier, a frequency mixer, a filter, a second variable gain control amplifier, and a gain control block. The gain controlled receiver automatically controls gains of the low noise amplifier, the first variable gain control amplifier, the frequency mixer, the filter, the second variable gain control amplifier by detecting strength of the signals processed in the receiver. Therefore, without an additional manual tuning operation, the gain of the receiver can be automatically maintained in an optimal state. A multi-band processing receiver includes a first receiving unit, a second receiving unit, and a switch. The multi-band processing receiver can process three or more RF signals in multi-band by using a single receiver.
    Type: Application
    Filed: October 1, 2007
    Publication date: April 3, 2008
    Applicant: FCI INC.
    Inventor: Myung Woon HWANG
  • Patent number: 7324787
    Abstract: In a radio communication system having a phase control loop for phase modulation and an amplitude control loop for amplitude modulation and being capable of time divisional transmission and reception under a predetermined time management, when transmission in a first mode is switched to transmission in a second mode or when transmission in the second mode is switched to transmission in the first mode, the output level of the power amplifier is lowered once to a predetermined level higher than the level when transmission related circuits are activated, and thereafter the output level of the power amplifier is again ramped after the settings have been changed but without starting of a transmission oscillator, establishing of the phase control loop and the amplitude control loop.
    Type: Grant
    Filed: July 29, 2004
    Date of Patent: January 29, 2008
    Assignees: Renesas Technology Corporation, TTPCOM Limited
    Inventors: Noriyuki Kurakami, Kazuhiko Hikasa, Ryoichi Takano, Patrick Wurm
  • Patent number: 7308239
    Abstract: A receiver for receiving an amplitude shift keying signal includes: a threshold signal generating circuit that has a first diode to which a received amplitude shift keying signal is inputted and generates a threshold signal which practically follows a peak value of the amplitude shift keying signal; an input circuit including a second diode to which a received amplitude shift keying signal is inputted; a first comparator to which the amplitude shift keying signal that is outputted from the input circuit through the second diode is inputted, the first comparator acting with the threshold signal that is outputted from the threshold signal generating circuit through the first diode as a first threshold; a detection circuit for detecting output from the first comparator; and a second comparator to which output from the detection circuit is inputted, the second comparator acting with a second threshold that is a predetermined fixed value.
    Type: Grant
    Filed: April 21, 2004
    Date of Patent: December 11, 2007
    Assignee: Yazaki Corporation
    Inventor: Sayaka Suwabe
  • Patent number: 7302241
    Abstract: A wireless communication unit (300) incorporates a receiver comprising radio frequency circuitry (210, 220, 230, 240) for receiving a radio frequency signal and converting the radio frequency signal to a low frequency signal. A signal level adjustment circuit receives the low frequency signal and an analogue to digital converter (370), operably coupled to the signal level adjustment circuit receives an adjusted low frequency signal and providing a digital received signal. A signal processor (108) operably coupled to the analogue to digital converter (370) processes the digital received signal. The signal level adjustment circuit includes a low frequency amplifier (360) whose gain is arranged to be dependent upon a clip point of the analogue to digital converter (370).
    Type: Grant
    Filed: December 16, 2002
    Date of Patent: November 27, 2007
    Assignee: Motorola, Inc.
    Inventor: Matthias Koenig
  • Patent number: 7254194
    Abstract: A communication receiver amplifies a pulse-amplitude-modulated (PAM) signal representing an integer-valued sequence of first data elements (D1) with an adjustable first gain (G1) and digitizes the amplified signal to produce a sequence of second data elements (D2) representing successive magnitudes of the PAM signal. A first automatic gain control (AGC) circuit determines the rate at which magnitudes of the second data sequence elements fall within a first range and adjusts G1 to maintain that rate within a second range. Digital signal processing circuits within the receiver process the second data to produce a sequence of third data elements (D3), each having a real number value substantially equal to a product of a second gain G2 and a corresponding one of the first data elements D1. A slicer rounds the real number represented by each third data sequence element to produce a corresponding integer-valued element of a fourth data sequence (D4).
    Type: Grant
    Filed: January 25, 2002
    Date of Patent: August 7, 2007
    Assignee: Infineon Technologies North America Corp.
    Inventors: Leon Chia-Liang Lin, Gerchih Chou
  • Patent number: 7200370
    Abstract: A Radio Frequency (RF) power amplifier includes a transconductance stage, an AC coupling element, and a cascode stage. The transconductance stage is adapted to receive an input RF voltage signal and to produce an output RF current signal. The cascode stage is adapted to receive an input RF current signal and to produce an output RF voltage signal. The AC coupling element couples between the transconductance stage and the cascode stage and is operable to AC couple the output RF current signal of the transconductance stage as the input RF current signal of the cascode stage.
    Type: Grant
    Filed: March 12, 2004
    Date of Patent: April 3, 2007
    Assignee: Broadcom Corporation
    Inventor: Arya Reza Behzad
  • Patent number: 7136618
    Abstract: A control portion detects the presence or absence of a pulse signal provided from a satellite broadcast receiver through a port PO to output a control signal PDOUT. In accordance with control signal PDOUT, a power supply circuit stops a supply of one of a power supply potential BIAS1 fed to LNA 22A and a power supply potential BIAS2 fed to LNA 22B. Therefore, the power consumption in an LNB designed for multi-satellite can be reduced and even a satellite broadcast receiver having a small current-supply capability can be connected. In this way, a low noise block down converter for multi-satellite with lower power consumption can be provided.
    Type: Grant
    Filed: January 2, 2003
    Date of Patent: November 14, 2006
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Masahiro Kato, Motohisa Nishina
  • Patent number: 7123899
    Abstract: An upconverter for mixing a single-ended RF signal with a differential local oscillator signal to generate a differential IF signal, that includes a source degenerated first differential pair comprising matched first and second transistors, each having source, gate and drain terminals, wherein the gate of the first transistor receives the input signal and the gate of the second transistor receives a ground potential, and a second differential pair comprising matched third and fourth transistors, each having source, gate and drain terminals, and a third differential pair comprising matched fifth and sixth transistors, each having source, gate and drain terminals, wherein the sources of the third and fourth transistors are coupled to the drain of the first transistor and the sources of the fifth and sixth transistors are coupled to the drain of the second transistor, the gate of the third transistor is coupled to the gate of the fifth transistor and the gate of the fourth transistor is coupled to the gate of th
    Type: Grant
    Filed: September 6, 2000
    Date of Patent: October 17, 2006
    Assignee: Industrial Technology Research Institute
    Inventors: Yung-Hue Chen, Ting-Yuan Cheng, Keng-Li Su
  • Patent number: 7113744
    Abstract: An exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a controller, and a self-testing unit. All of these components can be packaged for integration into a single IC including components such as filters and inductors. The controller for adaptive programming and calibration of the receiver, transmitter and LO generator. The self-testing unit generates is used to determine the gain, frequency characteristics, selectivity, noise floor, and distortion behavior of the receiver, transmitter and LO generator. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or the meaning of the claims.
    Type: Grant
    Filed: October 18, 2000
    Date of Patent: September 26, 2006
    Assignee: Broadcom Corporation
    Inventors: Shervin Moloudi, Maryam Rofougaran
  • Patent number: 7058370
    Abstract: A transmission power amplifier unit of a base-station apparatus for compensating for non-linear distortion of a transmission power amplifier by feed-forward control is provided with a gain varying unit for varying gain of the transmission power amplifier unit. At start-up of the transmission power amplifier unit, a controller determines whether the base-station apparatus is in a blossoming mode or breathing mode, maximizes gain of the transmission power amplifier unit by controlling the gain varying unit if the mode is the blossoming mode and increases the gain gradually in proportion to the passage of time if the mode is the breathing mode.
    Type: Grant
    Filed: January 29, 2002
    Date of Patent: June 6, 2006
    Assignee: Fujitsu Limited
    Inventors: Yutaka Saito, Ayanori Matsuda
  • Patent number: 7031682
    Abstract: A gain control circuit has a transmission power amplifier that amplifies a transmission signal to a predetermined level. An adjacent channel leak power ratio monitor finds a ratio of a distortion element corresponding to an adjacent channel leak power to a main element from an output signal supplied from the transmission power amplifier, and outputs the found ratio as an ACPR monitor value. A power supply control section variously controls power supply to the transmission power amplifier with use of the ACPR monitor value supplied from the adjacent channel leak power ratio monitor. A transmission signal level variable section controls a gain of a transmission signal path on the basis of a transmission level monitor value supplied from the adjacent channel leak power ratio monitor, thereby varying a level of the transmission signal.
    Type: Grant
    Filed: March 1, 2002
    Date of Patent: April 18, 2006
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Mikio Hayashihara
  • Patent number: 6985706
    Abstract: A method and apparatus for rapid alignment of adaptive feed forward power amplifiers are disclosed. Successful alignment settings are correlated with the operating conditions that affect the gain and phase of an amplifier. These operating conditions may include input power level, carrier frequency, temperature, DC supply voltage, or others. The successful alignment settings along with the corresponding operating conditions are stored in a list that is indexed using multi-dimensional attribute vectors. The elements of the list are generated automatically.
    Type: Grant
    Filed: January 21, 2004
    Date of Patent: January 10, 2006
    Assignee: Powerwave Technologies, Inc.
    Inventor: Richard Neil Braithwaite
  • Patent number: 6915141
    Abstract: A communications device includes a frequency conversion circuit and a control circuit. An antenna receives a radio signal at a first frequency and converts it into a radio frequency (RF) signal of the first frequency. The frequency conversion circuit is associated with the antenna and configured to convert the RF signal into a first signal component and a second signal component. The first and second signal components occupy a baseband. The control circuit has first ports connected to the frequency conversion circuit to receive the first and second signal components and second ports connected to a processor circuit to output amplified first and second signal components, and separate channels for the first and second signal components existing between the first and second ports. Each channel comprises an amplifier and a feedback loop configured to control the amplifier as a function of a reference signal and a control signal derived from the RF signal.
    Type: Grant
    Filed: October 1, 2002
    Date of Patent: July 5, 2005
    Assignee: Skyworks Solutions, Inc.
    Inventor: Aravind Loke
  • Publication number: 20040266381
    Abstract: An automatic gain control (AGC) circuit has an automatic gain controlled amplifier connected in series with a DC blocking capacitor. A reference DC voltage is selectively applied to an input of the automatic gain controlled amplifier and to an output of the DC blocking capacitor output so as to cause the DC blocking capacitor to store a charge proportional to a DC voltage offset introduced by the controllable gain amplifier. The selectively application of the reference DC voltage is momentarily applied for a duration of less than about 1 microsecond and preferably about 0.4 microseconds. The AGC circuit, including both the amplifier and capacitor, are fabricated as an integrated circuit device.
    Type: Application
    Filed: April 27, 2004
    Publication date: December 30, 2004
    Inventor: Hassan Shafeeu
  • Patent number: 6829471
    Abstract: A power amplifier system and method for locating carrier frequencies across a frequency band, identifying the modulation format of each carrier, and locating and suppressing undesired intermodulation distortion (IMD) products generated by the power amplifier. The system includes an amplifier for amplifying RF carrier signals in a main signal path, a variable phase shifter and variable attenuator on a feed forward path, and a tunable receiver that digitizes a portion of the frequency band to baseband. The tunable receiver includes a tunable voltage controlled oscillator which provides an oscillating frequency to a mixer and is phase-locked to a highly stable reference oscillator. The mixer downconverts a desired RF based on the oscillating frequency to IF. A filter passes only a selected portion of the IF signals, and the filter has a passband sufficient to discern both narrowband and wideband carriers and their associated IMD products.
    Type: Grant
    Filed: March 6, 2002
    Date of Patent: December 7, 2004
    Assignee: Andrew Corporation
    Inventors: Paul E. White, Thomas A. Bachman, II, Robert W. Kooker, Leonard Sarver, Robert Snyder, Paul Everline
  • Publication number: 20040214542
    Abstract: A receiver for receiving an amplitude shift keying signal includes: a threshold signal generating circuit that has a first diode to which a received amplitude shift keying signal is inputted and generates a threshold signal which practically follows a peak value of the amplitude shift keying signal; an input circuit including a second diode to which a received amplitude shift keying signal is inputted; a first comparator to which the amplitude shift keying signal that is outputted from the input circuit through the second diode is inputted, the first comparator acting with the threshold signal that is outputted from the threshold signal generating circuit through the first diode as a first threshold; a detection circuit for detecting output from the first comparator; and a second comparator to which output from the detection circuit is inputted, the second comparator acting with a second threshold that is a predetermined fixed value.
    Type: Application
    Filed: April 21, 2004
    Publication date: October 28, 2004
    Applicant: YAZAKI CORPORATION
    Inventor: Sayaka Suwabe