And Tuning Means Patents (Class 330/305)
  • Patent number: 10277168
    Abstract: Systems, methods and apparatus for efficient power control and/or compensation with respect to a varying supply voltage of an RF amplifier for amplification of a constant envelope RF signal are described. A reduction in a size of a pass device of an LDO regulator is obtained by removing the pass device of the LDO regulator from a main current conduction path of the RF amplifier. Power control and/or compensation is provided by varying one or more gate voltages to cascoded transistors of a transistor stack of the RF amplifier according to a power control voltage. Various configurations for controlling the gate voltages are presented by way of a smaller size LDO regulator or by completely removing the LDO regulator. In a case where a supply voltage to the transistor stack varies, such as in a case of a battery, a compensation circuit is used to adjust the power control voltage in view of a variation of the supply voltage, and therefore null a corresponding drift/variation in output power of the RF amplifier.
    Type: Grant
    Filed: January 24, 2018
    Date of Patent: April 30, 2019
    Assignee: pSemi Corporation
    Inventor: David Kovac
  • Patent number: 10148239
    Abstract: A circuit with co-matching topology for transmitting and receiving RF signals, said circuit comprising: a first sub-circuit comprising a first inductive component and a first capacitive component to form a low-pass filter for transmitting a first RF signal from a first amplifier to an antenna, wherein the first inductive component is coupled to a ground via a first switch; and a second sub-circuit comprising a second inductive component and a second capacitive component for receiving a second RF signal from the antenna to an input terminal of a second amplifier, wherein said input terminal of the second amplifier is coupled to the ground via a second switch; wherein when the first amplifier is transmitting the first RF signal, the first switch is turned off and the second switch is turned on, and wherein when the second amplifier is receiving the second RF signal, the first switch is turned on and the second switch is turned off.
    Type: Grant
    Filed: November 13, 2017
    Date of Patent: December 4, 2018
    Assignee: RAFAEL MICROELECTRONICS, INC.
    Inventors: Ying Yao Lin, Tao Chiang
  • Patent number: 9941849
    Abstract: An front end module (FEM) integrated circuit (IC) architecture that uses the same LNA in each of several frequency bands extending over a wide frequency range. In some embodiments, switched impedance circuits distributed throughout the FEM IC allow selection of the frequency response and impedances that are optimized for particular performance parameters targeted for a desired device characteristic. Such switched impedance circuits tune the output and input impedance match and adjust the gain of the LNA for specific operating frequencies and gain targets. In addition, adjustments to the bias of the LNA can be used to optimize performance trade-offs between the total direct current (DC) power dissipated versus radio frequency (RF) performance. By selecting appropriate impedances throughout the circuit using switched impedance circuits, the LNA can be selectively tuned to operate optimally at a selected bias for operation within selected frequency bands.
    Type: Grant
    Filed: February 10, 2017
    Date of Patent: April 10, 2018
    Assignee: pSemi Corporation
    Inventors: Emre Ayranci, Miles Sanner
  • Patent number: 9853614
    Abstract: An apparatus includes an amplifier and a first inductor coupled to an input of the amplifier. The apparatus also includes a second inductor that is inductively coupled to the first inductor and that couples the amplifier to a first supply node. The apparatus further includes a third inductor that is inductively coupled to the first inductor and to the second inductor and that couples the amplifier to a second supply node.
    Type: Grant
    Filed: December 4, 2014
    Date of Patent: December 26, 2017
    Assignee: QUALCOMM Incorporated
    Inventors: Chuan Wang, Dongling Pan
  • Patent number: 9813033
    Abstract: An inductor isolation apparatus and method to reduce interaction between inductors on an integrated circuit.
    Type: Grant
    Filed: September 4, 2015
    Date of Patent: November 7, 2017
    Assignee: Innophase Inc.
    Inventors: Nicolo Testi, Yang Xu
  • Patent number: 9692368
    Abstract: An apparatus includes amplification circuitry configured to amplify a radio frequency (RF) signal. The apparatus also includes differential inductors coupled to an output of the amplification circuitry. The differential inductors include a first inductor serially coupled to a second inductor, and the differential inductors are configured to filter the RF signal and to provide a differential output.
    Type: Grant
    Filed: September 9, 2014
    Date of Patent: June 27, 2017
    Assignee: QUALCOMM Incorporated
    Inventors: Saihua Lin, Anup Savla, Mounir Youssef Bohsali
  • Patent number: 9246454
    Abstract: An adaptive power amplifier that may be used in a wireless communication device is configured to adjust its load line or output impedance, the number of active amplifier cells in each amplification stage, the bias of the active amplifiers, and the supply voltage input capacitive load in accordance with a supply voltage modulation type provided to the power amplifier. The supply voltage modulation types include ET, APT, DC-DC, dual, multi-state or fixed voltage supply voltages. A supply voltage converter, signaled by a baseband processor, generates the selected type of supply voltage modulation for the adaptive power amplifier. The baseband processor may also provide a control interface signal to a controller within the adaptive power amplifier.
    Type: Grant
    Filed: December 17, 2013
    Date of Patent: January 26, 2016
    Assignee: Google Technology Holdings, LLC
    Inventors: Ernest Schirmann, Ryan J. Geodken, Armin W. Klomsdorf, Thomas D. Nagode
  • Patent number: 9154094
    Abstract: Embodiments of a Doherty power amplifier that maintain efficiency over a large operating average power range are disclosed. In one embodiment, the Doherty power amplifier includes reconfigurable main and auxiliary output matching networks and a fixed combining network. The reconfigurable main and auxiliary output matching networks can be reconfigured such that together the reconfigurable main output matching network, the reconfigurable auxiliary output matching network, and the fixed combining network provide proper load modulation for multiple different back-off power levels. As a result, the Doherty power amplifier maintains high efficiency over an extended back-off power level range.
    Type: Grant
    Filed: October 11, 2013
    Date of Patent: October 6, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Ahmed Mohamed Mahmoud Mohamed, Slim Boumaiza, Edward Sich
  • Patent number: 9143185
    Abstract: A transmit-receive switching circuit provided between a transmitter circuit configured to generate a transmission signal to be transmitted from an antenna and a receiver circuit configured to receive a reception signal received by the antenna, a transistor input control circuit configured to make the transmitter generate a transmission signal by an amplifying operation of a transistor in an output stage of the transmitter circuit when the transmission signal is transmitted from the antenna, and to short-circuit an output terminal of the transmitter circuit to a ground voltage when the reception signal is received by the antenna.
    Type: Grant
    Filed: August 29, 2013
    Date of Patent: September 22, 2015
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Tong Wang, Toshiya Mitomo
  • Patent number: 9041471
    Abstract: A radio frequency system includes a power amplifier that outputs a radio frequency signal to a matching network via a transmission line between the power amplifier and the matching network. A sensor monitors the radio frequency signal and generates first sensor signals based on the radio frequency signal. A distortion module determines a first distortion value according to at least one of (i) a sinusoidal function of the first sensor signals and (ii) a cross-correlation function of the first sensor signals. A first correction circuit (i) generates a first impedance tuning value based on the first distortion value and a first predetermined value, and (ii) provides feedforward control of impedance matching performed within the matching network including outputting the first impedance tuning value to one of the power amplifier and the matching network.
    Type: Grant
    Filed: October 2, 2013
    Date of Patent: May 26, 2015
    Assignee: MKS Instruments, Inc.
    Inventor: David J. Coumou
  • Patent number: 9024691
    Abstract: An exemplary embodiment of the present invention provides an adaptive power amplifier comprising a transistor, a resistive load, and a tuning circuit. The transistor has a drain, a source, and a gate. The resistive load can be electrically coupled to the drain. The tuning circuit can be electrically coupled to the drain in parallel with the transistor. The tuning circuit can comprise an inductor and a capacitive element. The inductor and capacitive element can be in series connection.
    Type: Grant
    Filed: May 17, 2013
    Date of Patent: May 5, 2015
    Assignee: Georgia Tech Research Corporation
    Inventors: Aritra Banerjee, Abhijit Chatterjee
  • Patent number: 9007130
    Abstract: A power amplifier configured to boost an AC signal. The power amplifier includes a first transistor, a second transistor, a first inductor connected between the first transistor and a voltage source, and a second inductor connected between the second transistor and ground. A first phase conditioner arranged at an input of the first transistor is configured to condition a phase of the AC signal such that the AC signal as received by the first transistor is out of phase with respect to the AC signal as received by the first inductor. A second phase conditioner arranged at an input of the second transistor is configured to condition a phase of the AC signal such that the AC signal as received by the second transistor is out of phase with respect to the AC signal as received by the second inductor.
    Type: Grant
    Filed: January 14, 2014
    Date of Patent: April 14, 2015
    Assignee: Marvell World Trade Ltd.
    Inventors: Sehat Sutardja, Poh Boon Leong, Ping Song, Nuntha Kumar Krishnasamy Maniam
  • Patent number: 8994456
    Abstract: A multi-stage amplifier is provided that uses tunable transmission lines, as well as a calibration method for the multi-stage amplifiers. A multi-stage amplifier, comprises a plurality of tunable amplification stages, wherein each of the tunable amplification stages comprises a tunable resonator based on a transmission line having a tunable element. The tunable elements may vary a capacitance or an inductance to tune a frequency of an applied signal. A calibration method is provided for a multi-stage amplifier having a plurality of transmission lines, an input stage and an output stage. The multi-stage amplifier is calibrated by generating a signal to determine a frequency for a substantially maximum power; generating an error signal by comparing the frequency for the substantially maximum power with a desired frequency; varying a digital control code applied to each of the tunable transmission lines, input stage and output stage until the error signal satisfies predefined criteria.
    Type: Grant
    Filed: January 30, 2012
    Date of Patent: March 31, 2015
    Assignee: International Business Machines Corporation
    Inventors: Mihai A. Sanduleanu, Alberto Valdes Garcia, David Goren, Shlomo Shlafman, Danny Elad
  • Publication number: 20150084699
    Abstract: Radio frequency (RF) front-end circuitry that includes control circuitry and an RF filter structure that includes a plurality of resonators are disclosed. In one embodiment, a first tunable RF filter path is defined by a first set of the plurality of resonators such that the first tunable RF filter path has a first amplitude and a first phase. A second tunable RF filter path is defined by a second set of the plurality of resonators such that the second tunable RF filter path has a second amplitude and a second phase. To provide antenna diversity and/or beam forming/beam steering, the control circuitry is configured to set a first amplitude difference between the first amplitude and the second amplitude to approximately a first target amplitude difference and set a first phase difference between the first phase and the second phase to approximately a first target phase difference.
    Type: Application
    Filed: November 26, 2014
    Publication date: March 26, 2015
    Inventors: George Maxim, Dirk Robert Walter Leipold, Baker Scott
  • Patent number: 8981850
    Abstract: A method and system for designing and implementing a reconfigurable Doherty amplifier system are disclosed. In one embodiment, a design method includes determining, using a processor, a first set of ABCD transmission parameters of a first output compensation network in a main path of a Doherty amplifier for the case where an auxiliary amplifier of the Doherty amplifier is off. The method further includes determining, using a processor, a second set of ABCD transmission parameters of a second output compensation network in an auxiliary path of the Doherty amplifier based on the first set of ABCD transmission parameters.
    Type: Grant
    Filed: January 25, 2013
    Date of Patent: March 17, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Slim Boumaiza, Ahmed Mohamed Mahmoud Mohamed
  • Patent number: 8941441
    Abstract: A low noise amplifier including a variable gain amplifier stage configured to accept an input signal and to provide a load driving signal; a tunable bandpass filter connected as a load to the variable gain amplifier stage, wherein the bandpass filter includes a cross-coupled transistor pair, and at least one cross-coupled compensation transistor pair biased in a subthreshold region configured to add a transconductance component when the load driving signal is of a magnitude large enough to decreases a transconductance of the cross-coupled transistor pair; and, a controller circuit configured to tune the bandpass filter. The filter can be tuned in respect to the frequency and the quality factor Q.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: January 27, 2015
    Assignee: Innophase Inc.
    Inventors: Nicolo Testi, Xi Li, Xuejun Zhang, Yang Xu
  • Patent number: 8928423
    Abstract: A narrow band receiver or transceiver for processing electrical signals. The narrow band receiver or transceiver includes an amplifier, a voltage controlled oscillator and a tuning assembly comprising at least one control loop for tuning of the voltage controlled oscillator. At least a gain control of the amplifier is coupled to the control loop for simultaneously tuning the output amplitude of the voltage controlled oscillator and the gain of the amplifier. A compensation of the effect of variation on the gain of the amplifier, which includes an LC tank circuit, is performed by using an information in another LC tank circuit of the voltage controlled oscillator in the control loop.
    Type: Grant
    Filed: January 11, 2013
    Date of Patent: January 6, 2015
    Assignee: EM Microelectronic-Marin S.A.
    Inventors: Armin Tajalli, Marc Morin
  • Patent number: 8928413
    Abstract: A method, device and system is disclosed for high efficiency power amplification of a signal over a broad range of output power. Two broad-banded, parallel-tuned class E power amplifiers are combined through a lossless half wave transmission line combiner and configured to operate in an outphased arrangement to permit amplitude modulation. Asymmetrical shunt tuned switches are tuned for efficient amplitude modulation while asymmetrical drain inductors provide enhanced efficiency at outphased conditions over that of a symmetrical circuit. The drain source inductors and transmission components are tuned for maximum efficiency at full power output and for minimum dissipation a zero power output. At zero degrees outphasing, the circuit operates as a conventional Class-E power amplifier. However, at 180 degrees outphasing, each quarterwave line in the combiner reflects back all incident power, permitting the circuit to operate as an unloaded resonant switching circuit.
    Type: Grant
    Filed: November 12, 2012
    Date of Patent: January 6, 2015
    Assignee: Rockwell Collins, Inc.
    Inventor: David W. Cripe
  • Patent number: 8928405
    Abstract: A circuit for amplifying the power of signal, the circuit comprising a power amplifier, a transformer and a load; wherein the transformer comprises a primary inductor and a secondary inductor, the first inductor being coupled to, and capable of being driven by, the power amplifier, and the secondary inductor coupled to, and capable of driving, the load; wherein a first one of the primary and secondary inductors is a variable inductor whose inductance is variable responsive to a control input in order to change the output power of the amplifier.
    Type: Grant
    Filed: September 10, 2012
    Date of Patent: January 6, 2015
    Assignee: Cambridge Silicon Radio Limited
    Inventors: Giuseppe Gramegna, Konstantinos Manetakis
  • Publication number: 20150002236
    Abstract: A cascaded arrangement of resonant tanks capable of widening frequency selection and tuning within an RF circuit is presented. Moreover, usage of DTC allows for larger frequency tuning per tank as well as handling of higher voltage swings while maintaining high linearity across the tuning range.
    Type: Application
    Filed: June 28, 2013
    Publication date: January 1, 2015
    Inventors: Chun-Cheng Wang, Jianhua Lu
  • Publication number: 20140361838
    Abstract: An amplifier includes a negative gain amplifier, a load element, and a transconductance device. The negative gain amplifier has an input and an output. The load element has a first terminal coupled to a power supply voltage terminal, and a second terminal. The transconductance device has a first current electrode coupled to the second terminal of the load element, a control electrode coupled to the output of the negative gain amplifier, and a second current electrode coupled to the input of the negative gain amplifier.
    Type: Application
    Filed: June 5, 2013
    Publication date: December 11, 2014
    Inventors: Yu Su, Mustafa H. Koroglu, Ruifeng Sun, Krishna Pentakota, Pio Balmelli, Ramin Khoini-Poorfard
  • Patent number: 8907723
    Abstract: According to an embodiment, a power amplifier includes a variable passive element and a comparator. The variable passive element is connected directly or indirectly to a first terminal of a switch element and serves to increase or reduce a resonant frequency of the amplifier. The comparator compares a voltage of interest with a reference voltage and outputs a control voltage for the variable passive element based on a difference between the voltage of interest and the reference voltage.
    Type: Grant
    Filed: January 22, 2014
    Date of Patent: December 9, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kohei Onizuka, Shigehito Saigusa
  • Patent number: 8907727
    Abstract: Embodiments are directed to capacitance compensation via a compensation device coupled to a gain device to compensate for a capacitance change occurring due to an input signal change, along with a controller coupled to the compensation device to receive the input signal and to control an amount of compensation based on the input signal. In some embodiments, banks may be formed of multiple compensation devices, where each of the banks has a different size and is coupled to receive a different set of bias voltages.
    Type: Grant
    Filed: November 30, 2012
    Date of Patent: December 9, 2014
    Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.
    Inventors: Anil Samavedam, David E. Bockelman, Vishnu Srinivasan, Eric Kimball
  • Patent number: 8866555
    Abstract: A power amplifier circuit, comprising: an amplifier for receiving an input signal to be amplified; a power input for coupling the amplifier to a power supply; and a transformer for providing the amplified signal from the amplifier to a load, comprising a primary inductor and a secondary inductor. The power amplifier circuit is characterized by: a first capacitor coupled in parallel with the primary inductor; and a second capacitor coupled in parallel with the secondary inductor; wherein at least one of the first and second capacitors has a variable capacitance.
    Type: Grant
    Filed: August 29, 2012
    Date of Patent: October 21, 2014
    Assignee: Cambridge Silicon Radio Limited
    Inventor: Konstantinos Manetakis
  • Patent number: 8847683
    Abstract: A differential amplifying circuit includes: two metal oxide semiconductor transistors to form a differential pair and receive a differential signal; a plurality of capacitance elements coupled in series between drains of the two metal oxide semiconductor transistors; and an inductance circuit coupled between at least one connection node of the plurality of capacitance elements and a bias power terminal.
    Type: Grant
    Filed: April 13, 2012
    Date of Patent: September 30, 2014
    Assignee: Fujitsu Limited
    Inventor: Noriaki Shirai
  • Patent number: 8829995
    Abstract: A method is provided for process, voltage, temperature (PVT) stable transfer function calibration in a differential amplifier. The gain resistors of a differential amplifier are initially selected to achieve a flat amplitude transfer function in the first frequency band. After calibration, the degeneration capacitor is connected and tuned until a peaked amplitude transfer function is measured, which is resistant to variations in PVT. As an alternative, the degeneration capacitor is not disconnected during initial calibration. Then, the gain resistors and the degeneration capacitor values are selectively adjusted until the first peaked amplitude transfer function is obtained. The peaked amplitude transfer function remains even more stable to variations in PVT than the flat amplitude calibration method.
    Type: Grant
    Filed: September 9, 2013
    Date of Patent: September 9, 2014
    Assignee: Applied Micro Circuits Corporation
    Inventor: Hanan Cohen
  • Patent number: 8810315
    Abstract: A differential amplifying circuit includes: two metal oxide semiconductor transistors to form a differential pair and receive a differential signal; a plurality of capacitance elements coupled in series between drains of the two metal oxide semiconductor transistors; and an inductance circuit coupled between at least one connection node of the plurality of capacitance elements and a bias power terminal.
    Type: Grant
    Filed: April 13, 2012
    Date of Patent: August 19, 2014
    Assignee: Fujitsu Limited
    Inventor: Noriaki Shirai
  • Patent number: 8803615
    Abstract: An impedance matching circuit with at least one tunable notch filter for a power amplifier is disclosed. The power amplifier amplifies an input radio frequency (RF) signal and provides an amplified RF signal. The impedance matching circuit performs output impedance matching for the power amplifier and includes at least one tunable notch filter. Each tunable notch filter has a notch that can be varied in frequency to provide better attenuation of an undesired signal. The at least one tunable notch filter attenuates at least one undesired signal in the amplified RF signal. The at least one tunable notch filter may include (i) a first tunable notch filter to attenuate a first undesired signal at a second harmonic of the amplified RF signal and/or (ii) a second tunable notch filter to attenuate a second undesired signal at a third harmonic of the amplified RF signal.
    Type: Grant
    Filed: January 23, 2012
    Date of Patent: August 12, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Jose Cabanillas, Calogero D. Presti, Babak Nejati, Guy Klemens
  • Patent number: 8766712
    Abstract: Apparatus and methods are also disclosed related to tuning a quality factor of an LC circuit. In some implementations, the LC circuit can be embodied in a low-noise amplifier (LNA). A quality factor adjustment circuit can increase and/or decrease conductance across the LC circuit. This can stabilize a parasitic resistance in parallel with the LC circuit. In this way, a gain of the LC circuit can be stabilized.
    Type: Grant
    Filed: May 4, 2012
    Date of Patent: July 1, 2014
    Assignee: Analog Devices, Inc.
    Inventor: Hyman Shanan
  • Patent number: 8736374
    Abstract: An amplifier includes a first switch and a second switch each having a first terminal and a second terminal. The first terminals of the first and second switches respectively communicate with a first tank circuit and a second tank circuit. The second terminal of the second switch communicates with the second terminal of the first switch. A first capacitance having a first terminal connected directly to (i) the second terminal of the first switch and (ii) the second terminal of the second switch. A second terminal of the first capacitance is connected directly to a first input voltage of the amplifier. A first load is connected across (i) the first terminal of the first switch and (ii) the first terminal of the second switch. The amplifier generates a first output across the first load.
    Type: Grant
    Filed: February 18, 2013
    Date of Patent: May 27, 2014
    Assignee: Marvell World Trade Ltd.
    Inventors: Sehat Sutardja, Farbod Aram
  • Publication number: 20140125417
    Abstract: A power amplifier configured to boost an AC signal. The power amplifier includes a first transistor, a second transistor, a first inductor connected between the first transistor and a voltage source, and a second inductor connected between the second transistor and ground. A first phase conditioner arranged at an input of the first transistor is configured to condition a phase of the AC signal such that the AC signal as received by the first transistor is out of phase with respect to the AC signal as received by the first inductor. A second phase conditioner arranged at an input of the second transistor is configured to condition a phase of the AC signal such that the AC signal as received by the second transistor is out of phase with respect to the AC signal as received by the second inductor.
    Type: Application
    Filed: January 14, 2014
    Publication date: May 8, 2014
    Inventors: Sehat Sutardja, Poh Boon Leong, Ping Song, Nuntha Kumar Krishnasamy Maniam
  • Patent number: 8717104
    Abstract: A system for compensating impedance mismatch at an output terminal of a RF power amplifier is disclosed. In an embodiment, the system includes a plurality of samplers to measure a first set of parameters associated with an amplified signal being generated by the power amplifier. The first set of parameters is transmitted to a processing unit. The processing unit varies an impedance of an impedance element based on the first set of parameters. The impedance element is connected to the output terminal of the power amplifier.
    Type: Grant
    Filed: February 14, 2012
    Date of Patent: May 6, 2014
    Assignee: Anadigics, Inc.
    Inventor: Wyman Williams
  • Patent number: 8629725
    Abstract: Power amplifier (PA), regardless of the process used for the manufacturing of its devices, suffers from a nonlinear output capacitance that has significant impact on various aspects of the PA performance. This output capacitance is dependent on the large output voltage swing. Accordingly a compensation capacitance is added at the output of the PA that has a behavior that is inverse respective of the output voltage of that of the output capacitance of the PA. Connecting the compensation capacitor in parallel to the PA output capacitance, results in a total capacitance that is the sum of the output capacitance and its compensation capacitance. The total output capacitance is therefore essentially stable throughout the output voltage swing.
    Type: Grant
    Filed: December 2, 2011
    Date of Patent: January 14, 2014
    Assignee: RF Micro Devices (Cayman Islands), Ltd.
    Inventors: Baker Scott, George Maxim, Chu Hsiung Ho, Stephen Franck, Tom Biedka
  • Patent number: 8604883
    Abstract: According to one embodiment, a class-C power amplifier includes an amplifying element whose power supply voltage is expressed as Vdc and whose maximum current is expressed as Imax, a conduction angle ?o of the amplifying element being less than ?(rad), and load impedance of a fundamental wave being expressed as Z1=R1+j·X1 and load impedance of a 2nd harmonic being expressed as Z2=R2+j·X2 which are observed from a dependent current source of an equivalent circuit of the amplifying element, wherein a relationship between variables X1 and R1 is set to ?R1<=X1<=R1, variable R1 is set to R1=Vdc/Imax·?·{1?cos(?o/2)}/{?o/2?sin(?o)/2}, and variable X2/X1 is set to X2/X1=?{?o/2?sin(?o)/2}/{sin(?/2)?sin(1.5·?o)/3}, or each of the variables is set thereto so as to become equal substantially.
    Type: Grant
    Filed: October 6, 2011
    Date of Patent: December 10, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kazutaka Takagi, Naotaka Tomita
  • Patent number: 8593225
    Abstract: A power amplifier is configured to generate impedances at harmonic frequencies such that the power amplifier operates in a class C mode in a low output amplitude range and in a class F or inverse F mode in a high output amplitude range. Related methods of operation are also discussed.
    Type: Grant
    Filed: December 12, 2012
    Date of Patent: November 26, 2013
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventor: Richard Hellberg
  • Patent number: 8593219
    Abstract: A radio frequency (RF) amplifier structure provides highly efficient RF signal amplification across a wide bandwidth, when implemented in both inverting and non-inverting Doherty designs, by employing matching impedance transform circuits that comprise a low pass multiple section inductance-capacitance circuit and that provides impedance matching between the output of an amplifier device and a power combiner, wherein the output matching impedance transform circuit has approximately an odd multiple of 90 electrical degrees over the RF amplifier structure's frequency range of operation, and adjustable phase delay circuits that route an amplified RF signal to the power combiner and that are controllably adjusted based on a frequency of an RF input signal over an operating frequency range of the RF amplifier structure.
    Type: Grant
    Filed: October 16, 2012
    Date of Patent: November 26, 2013
    Assignee: Motorola Solutions, Inc.
    Inventor: Loren F. Root
  • Publication number: 20130307635
    Abstract: A directional coupler utilizes an inductive element of a power amplifier and a coupled conductive element. The inductive element of the power amplifier is a functioning element within the power amplifier and at least part of the inductive element of the power amplifier is disposed in a multi-layer substrate. At least part of the coupled conductive element is disposed in the multi-layer substrate. The coupled conductive element is configured to be inductively coupled to the inductive element of the power amplifier such that the coupled conductive element carries a first RF signal that is representative of a second RF signal within the inductive element of the power amplifier.
    Type: Application
    Filed: March 15, 2013
    Publication date: November 21, 2013
    Applicant: Black Sand Technologies, Inc.
    Inventor: Black Sand Technologies, Inc.
  • Patent number: 8576013
    Abstract: A radio frequency system includes a power amplifier that outputs a radio frequency signal to a matching network via a transmission line between the power amplifier and the matching network. A sensor monitors the radio frequency signal and generates first sensor signals based on the radio frequency signal. A distortion module determines a first distortion value according to at least one of (i) a sinusoidal function of the first sensor signals and (ii) a cross-correlation function of the first sensor signals. A first correction circuit (i) generates a first impedance tuning value based on the first distortion value and a first predetermined value, and (ii) provides feedforward control of impedance matching performed within the matching network including outputting the first impedance tuning value to one of the power amplifier and the matching network.
    Type: Grant
    Filed: December 29, 2011
    Date of Patent: November 5, 2013
    Assignee: MKS Instruments, Inc.
    Inventor: David J. Coumou
  • Patent number: 8576010
    Abstract: An apparatus and method for a switched capacitor architecture for multi-band Doherty power amplifiers are provided. The apparatus is for amplifying Radio Frequency (RF) signals, and the apparatus includes a multi-band Power Amplifier (PA) including a plurality of input matching circuits including switchable capacitors, and a plurality of output matching circuits including the switchable capacitors, wherein the multi-band PA is tunable to more than one RF frequency band.
    Type: Grant
    Filed: September 28, 2011
    Date of Patent: November 5, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Naveen Yanduru, Robert Monroe, Mike Brobston
  • Patent number: 8564373
    Abstract: The present invention relates to a power amplifier unit (30, 40, 50, 60a-60d, 70) comprising a power amplifier element (31, 41, 51, 71) and a matching unit (32, 42, 52, 72). The unit comprises an impedance matched MicroElectroMechanicalSystem (MEMS) switch element (33, 43, 53, 73) between said power amplifier element (31, 41, 51, 71) and said matching unit (32, 42, 52, 72).
    Type: Grant
    Filed: September 15, 2011
    Date of Patent: October 22, 2013
    Assignees: Sony Corporation, Sony Mobile Communications AB
    Inventors: Filip Skarp, Olof Zander
  • Patent number: 8502608
    Abstract: For use in a wireless network, a tunable power amplifier circuit includes a power amplifier transistor and a plurality of laminate MEMS (microelectromechanical system) capacitors coupled to the power amplifier transistor. The laminate MEMS capacitors are arranged in a tunable matching network and configured to provide a matching impedance for the power amplifier transistor. In some embodiments, the laminate MEMS capacitors are arranged in a binary array.
    Type: Grant
    Filed: November 1, 2010
    Date of Patent: August 6, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Michael Lee Brobston, Robert W. Monroe
  • Patent number: 8493149
    Abstract: Systems and methods are provided for facilitating variable precision tuning of an amplifier circuit. In accordance with one aspect of the present disclosure, the system includes an amplifier having multiple tuning stages to set the gain of the amplifier to discrete gain levels. In particular embodiments, the tuning stages are connected in series and each of the tuning stages includes a resistor connected in parallel to a switch, which can be disengaged to cause the amplifier to set the gain to an adjacent gain level. In certain embodiments, the difference in gain between each adjacent one of the plurality of gain levels is more at higher gain levels than at lower gain levels.
    Type: Grant
    Filed: August 25, 2011
    Date of Patent: July 23, 2013
    Assignee: Fujitsu Limited
    Inventor: Samir Parikh
  • Publication number: 20130099797
    Abstract: A variable impedance device includes a passive tuner that includes at least one variable component, which is controllable to apply a variable impedance value to an input signal of the passive tuner. A low noise amplifier is configured to supply the input signal to the passive tuner by amplifying an input RF (radio frequency) signal.
    Type: Application
    Filed: August 31, 2012
    Publication date: April 25, 2013
    Applicants: STMICROELECTRONICS SA, STMICROELECTRONICS (CROLLES 2) SAS
    Inventors: Thomas Quemerais, Daniel Gloria, Romain Debroucke
  • Patent number: 8422698
    Abstract: A signal processing apparatus includes: clip detector means that detects presence/absence of a clipped part with a deformed waveform in each of N audio signals output from N microphones (where N is an integer equal to or greater than 2) based on a dynamic range of a circuit; and interpolation means that treats an audio signal in the N audio signals which has the clipped part detected by the clip detector means as an interpolation target, and other audio signals as non-interpolation targets, and interpolates the waveform of the clipped part of the interpolation target using the waveform of at least one audio signal in the non-interpolation targets.
    Type: Grant
    Filed: February 17, 2010
    Date of Patent: April 16, 2013
    Assignee: Sony Corporation
    Inventor: Okifumi Hosomi
  • Patent number: 8380153
    Abstract: A radio front end includes a transformer and an adjustable load. The transformer includes a first winding and a second winding, wherein the first winding is operably coupled to an antenna and the second winding coupled to at least one of a power amplifier and a low noise amplifier. The adjustable load is operably coupled to the second winding, wherein the adjustable load provides a first impedance based on a first impedance selection signal when the radio front end is in a transmit mode and provides a second impedance based on a second impedance selection signal when the radio front end is in a receive module such that impedance at the first winding is substantially similar in the transmit mode and in the receive mode.
    Type: Grant
    Filed: August 10, 2012
    Date of Patent: February 19, 2013
    Assignee: Broadcom Corporation
    Inventors: Rozieh Roufoogaran, Jesus Alfonso Castaneda
  • Patent number: 8378750
    Abstract: A class AB amplifier includes a first inductor having a first terminal in communication with a voltage source terminal. A first transistor has a drain terminal in communication with a second terminal of the first inductor. A second transistor has a source terminal in communication with a source terminal of the first transistor. A second inductor has a first terminal in communication with a drain terminal of the second transistor and a second terminal in communication with a reference potential. The drain terminals of the first transistor and the second transistor are capacitively coupled together.
    Type: Grant
    Filed: March 9, 2011
    Date of Patent: February 19, 2013
    Inventors: Sehat Sutardja, Farbod Aram
  • Patent number: 8358172
    Abstract: A peaking circuit for adjusting peaking of a high-frequency signal, comprises: a first inductor; a second inductor which is electromagnetically coupled with the first inductor; a signal input section which receives an input signal; a transistor which adjusts electric current passing through the second inductor according to the input signal inputted via the signal input section; and a signal output section which outputs a signal whose peaking has been adjusted by the first inductor. Mutual inductance of the electromagnetically coupled first and second inductors is changed by the adjustment of the electric current passing through the second inductor, according to the input signal inputted via the signal input section, with the use of the transistor, thereby adjusting the peaking of signal waveform of electric current passing through the first inductor, and the signal subjected to the peaking adjustment is outputted from the signal output section.
    Type: Grant
    Filed: February 9, 2011
    Date of Patent: January 22, 2013
    Assignee: Hitachi, Ltd.
    Inventors: Norio Chujo, Tsuneo Kawamata, Toshiaki Takai
  • Patent number: 8344810
    Abstract: A CMOS amplifier with integrated tunable band-pass function, a tunable active resistor structure, a method of amplifying an input signal and a method of fabricating an amplifier. The tunable active resistor structure comprises two symmetrically cross-coupled transistors.
    Type: Grant
    Filed: June 11, 2009
    Date of Patent: January 1, 2013
    Assignee: National University of Singapore
    Inventors: Yong Lian, Libin Yao, Xiaoyuan Xu, Xiaodan Zou
  • Publication number: 20120313708
    Abstract: A method and apparatus are provided for using an automatic BW adjustment circuit to automatically adjust the bandwidth of an electronic amplifier based on the amplitude of a signal that is output from a variable gain amplifier or of one or more variable gain stages that follow the amplifier. By automatically adjusting the bandwidth of the electronic amplifier based on the amplitude of the signal, bandwidth enhancement can be provided while also preventing, or at least reducing, peaking of the frequency response of the electronic amplifier.
    Type: Application
    Filed: June 7, 2011
    Publication date: December 13, 2012
    Applicant: AVAGO TECHNOLOGIES FIBER IP (SINGAPORE) PTE. LTD.
    Inventor: Seyed Hossein Miri Lavasani
  • Patent number: RE45418
    Abstract: A multi-band, multi-standard programmable power amplifier having tunable impedance matching input and output networks and programmable device characteristics. The impedance of either or both of the impedance matching input and output networks is tunable responsive to one or more control signals. In one example, the programmable power amplifier incorporates a feedback control loop and the control signal(s) are varied responsive to the feedback loop.
    Type: Grant
    Filed: July 27, 2012
    Date of Patent: March 17, 2015
    Assignee: TriDev Research LLC
    Inventor: Geoffrey C. Dawe