Abstract: Techniques for designing a switchable amplifier are described. In one aspect, a switchable amplifier including a core amplifier circuit configured to selectively enable one or more parallel input transistor pairs is described. The core amplifier circuit comprises a permanently enabled input transistor pair. In another aspect, a device operable between a first mode of operation and a second mode of operation comprising a receiver logic circuit for selectably enabling and disabling a plurality of input transistor pairs within a switchable amplifier is described where the switchable amplifier also includes a core amplifier circuit coupled to the receiver logic circuit for selectably enabling and disabling a transistor pair therein. The described switchable amplifiers result in the ability to provide varying amplifier performance characteristics based upon the current mode of operation of the device.

Abstract: A configurable antenna assembly includes an antenna structure and a configurable antenna interface. The antenna structure is operable, in a first mode, to provide a first antenna structure and a second antenna structure, wherein the first antenna structure receives an inbound radio frequency (RF) signal and the second antenna structure transmits an outbound RF signal. The configurable antenna interface is operable in the first mode to provide a first antenna interface and a second antenna interface, wherein the first antenna interface is configured in accordance with a receive adjust signal to adjust at least one of phase and amplitude of the inbound RF signal, and wherein the second antenna interface is configured in accordance with a transmit adjust signal to adjust at least one of phase and amplitude of the outbound RF signal.

Abstract: A waveform reconstruction circuit receives an rf signal from an antenna, digitizes it, and then generates an undistorted reconstructed waveform. The reconstructed waveform can then be conventionally mixed and demodulated to extract useful signal information with enhanced receiver fidelity and sensitivity.

Abstract: An apparatus and method for amplifying a transmission signals in multiple modes and multiple bands. The apparatus includes a tunable power amplifying module adapted to receive a plurality of signal types comprising multiple modes and multiple bands. The tunable power amplifying module includes a first and second power amplifier stages and a number of tunable matching networks configured to optimize an impedance value based on the mode and band of the signal to be amplified.

Abstract: A receiving device is provided capable of avoiding reception of unnecessary energy when a signal waveform actually changes on a receiving side. An impedance control circuit includes a sensing unit to sense one or more of a voltage, current, or power of a signal to be received by a receiving circuit. The impedance control unit varies an input impedance according to the change in the sensed one or more quantities so that the received signal will be reflected. Thus the excess energy of the signal is reflected and fed to any other receiving circuit achieving stable communications.

Abstract: There is provided a method that comprises identifying a parasitic signal transfer in a filter using a signal-directed graph; and adding compensation paths to the filter to reduce or eliminate the effect of the parasitic signal transfer A corresponding filter is provided which comprises a plurality of amplifier stages that generate one or more filter poles; at least one component coupled to at least one of the amplifier stages, the component causing a parasitic effect in the filter; and means for applying a compensation current to the at least one amplifier stage to reduce or eliminate the parasitic effect.

Abstract: A high-frequency circuit comprising a high-frequency switch circuit for switching the three-way connection of an antenna to a transmitting circuit for the first communications system, a receiving circuit for a first communications system, and a transmitting/receiving circuit for a second communications system; a first bandpass filter disposed between the antenna and the high-frequency switch circuit; and a balanced-unbalanced conversion circuit disposed between the receiving circuit of the first communications system and the high-frequency switch circuit.

Abstract: A loop directional coupler having a first waveguide, particularly a hollow, planar, or a coaxial conductor in the form of a half loop antenna having first and second antenna branches for the contact-free extraction of an incoming signal “a” on a second waveguide and a returning signal “b” on the second waveguide. The first antenna branch is connected to a first input of a first network and the second antenna branch is connected to a second input of the first network, the first network having a first power splitter at the first input and a second power splitter at the second input for dividing the signal present at each antenna branch, the first network having a first adder adding the signals of the first and second power splitters to each other, and a first subtractor subtracting the signals of the first and second power splitters from each other.

Abstract: A type-A demodulator comprising a first rectifier configured to rectify a radio frequency (RF) signal received through an antenna and output a first voltage, a second rectifier configured to rectify the voltage of the RF signal received through the antenna and output a second voltage having a different voltage level than the first voltage, and a pause data detector configured to compare the first voltage with the second voltage and detect received pause data.

Abstract: Communication is provided which includes receiving a transmitted radio signal at a powerline wherein the powerline functions as a receiving antenna for the wirelessly transmitted radio signal. The powerline is coupled to an input of a radio receiver using a coupler to communicate the radio signal to the radio receiver. For calibration purposes a second antenna not coupled to powerline may be used. A method for powerline communication across transformers, open circuit breakers, and other devices is also provided. In addition, a method of monitoring a device connected to a powerline is provided.

Abstract: Aspects of a method and system for a transformer-based high performance cross-coupled low noise amplifier may include one or more circuits that integrate within a single chip, a balun with a low-noise amplifier. A DC current biasing path for the low-noise amplifier may be provided through the integrated balun. The low-noise amplifier may be configured as a cross-coupled low-noise amplifier, where the balun may be directly coupled to the cross-coupled low-noise amplifier. The balun may comprise two or more inductors, wherein one or more of the inductors may provide an electrical path for allowing a DC bias current to flow to ground. Integrating a balun on a single chip with a low-noise amplifier may allow the use of a single received signal input terminal. The biasing voltage may be selected to optimize performance of the low-noise amplifier.

Abstract: A waveform reconstruction circuit receives an rf signal from an antenna, digitizes it, and then generates an undistorted reconstructed waveform. The reconstructed waveform can then be conventionally mixed and demodulated to extract useful signal information with enhanced receiver fidelity and sensitivity.

Abstract: An electronic apparatus includes: a first integrated circuit including an internal component section capable of being adjusted with adjustment data, a nonvolatile memory in which beforehand acquired adjustment data of a result of adjustment carried out in advance for the internal component section are stored, and an interface section having a data transfer function of transferring the beforehand acquired adjustment data read out from the nonvolatile memory to the outside and a data storage function of storing actual use adjustment data sent from the outside and supplying the stored actual use adjustment data to the internal component section; and a second integrated circuit including a signal processor, to which the interface section of the first integrated circuit is connected.

Abstract: A method for adjustment of a radio-frequency circuit by impedance loading features includes designing a plurality of test fixtures each corresponding to an impedance loading area according to a predefined operating frequency band, coupling each of the plurality of test fixtures to a test point of the radio-frequency circuit for measuring a plurality of radio-frequency characteristic sets, determining an optimal impedance loading area of the radio-frequency circuit according to the plurality of radio-frequency characteristic sets, and adjusting the radio-frequency circuit according to the optimal impedance loading area.

Abstract: A wide-band amplifier includes a band-pass filter made of an LC parallel resonant circuit and an LCR series resonant circuit. Both the LC parallel resonant circuit and the LCR series resonant circuit are connected in parallel to a current amplifier device. The band-pass filter has a plurality of poles as well as zeros provided therebetween in the s-plane, where some of the zeros are situated at locations other than the s-plane origing to improve a characteristic flatness in a passband. The output terminal of the amplifier device serves as an output terminal for the amplifier, so that the problem of group delay does not occur. A capacitance element between the output terminal of the amplifier and GND absorbs parasitic capacitance as part of constants to prevent degradation of the frequency characteristic.

Abstract: A programmable antenna assembly includes a configurable antenna structure, a configurable antenna interface, and a control module. The configurable antenna structure includes a plurality of antenna elements that, in response to an antenna configuration signal, are configured elements into at least one antenna. The configurable antenna interface module is coupled to the at least one antenna and, based on an antenna interface control signal, provides at least one of an impedance matching circuit and a bandpass filter. The control module is coupled to generate the antenna configuration signal and the antenna interface control signal in accordance with a first frequency band and a second frequency band such that the at least one antenna facilitates at least one of transmitting and receiving a first RF signal within the first frequency band and facilitates at least one of transmitting and receiving a second RF signal within the second frequency band.

Abstract: A system for receiving data is provided. The system includes an inductive data device, such as a device that receives high-speed data over an inductive coupling. An adjustable impedance is coupled to the inductive data device, where the adjustable impedance is used for dynamically controlling ringing in the inductive data device, such as by damping ringing signals generated by circuit inductances or capacitances.

Abstract: The present invention is to implement a SOP of a mobile RFID interrogator. The substrate has external connection terminal patterns on a first surface of a substrate and circuit wiring patterns on a second surface of the substrate. a high frequency front-end part, a power amplifier IC, an analog-digital signal processing chip and the like are mounted on the second surface. The high frequency front-end part is to transmit and receive a RFID signal. The power amplifier IC is to output an amplified high frequency transmission signal to the high frequency front-end part. The analog-digital signal processing chip is to output a high frequency transmission signal to the power amplifier IC and process the RFID signal received through the high frequency front-end part, a mold resin is to cover the second surface and components mounted on the second surface for electrical insulation from outside and physical protection from outside.

Abstract: A radio frequency (RF) transceiver includes a baseband processing module, a configurable receiver section, a configurable transmitter section and a configurable antenna assembly. The baseband processing module converts outbound data into an outbound symbol stream, converts an inbound symbol stream into inbound data and generates a transmit adjust signal and a receive adjust signal. The receiver section converts an inbound RF signal into the inbound symbol stream. The transmitter section converts the outbound symbol stream into an outbound RF signal. The antenna assembly receives the inbound RF signal via a first antenna structure and transmits the outbound RF signal via a second antenna structure. The first antenna structure and/or the configurable receiver section adjusts phase and/or amplitude of the inbound RF signal in accordance with the receive adjust signal.

Abstract: Aspects of a method and system for matching an integrated FM system to an antenna utilizing on-chip measurement of reflected signals are provided. In this regard a portion of a signal output by an integrated FM radio transmit block and reflected by an antenna may be routed to an on-chip signal analyzer. Accordingly, measurements of the reflected signals may be utilized to configure a matching network in order to provide a best impedance match between the FM radio and the antenna. In this regard, a best impedance match may maximize radiation efficiency and/or radiated power. Additionally, the configuration of the matching network may incorporate a correction algorithm/offset experimentally determined via a calibration utilizing external components.

Abstract: There is provided an amplifier circuit including: a first transistor having a source thereof connected to an input port and having a gate thereof grounded; a second transistor having a gate thereof grounded; a first inductor provided between a drain of the first transistor and a source of the second transistor; and a second inductor provided between a drain of the second transistor and an output port.

Abstract: The present invention provides a method and apparatus for correcting direct current (DC) offsets in radio output signals. The invention comprises a radio processor and a baseband processor. During a calibration routine, the baseband processor measures DC offset produced by the radio processor, generates a corresponding DC offset correction value, and writes the correction value to a discrete memory in the radio processor via a serial processor interface. During a subsequent normal receive operation, the radio processor reads the DC offset correction value from memory and feeds it into a into a digital to analog converter to produce an analog signal that in turn is fed into a radio receive path to nullify undesired DC offset.

Abstract: A dual band WLAN (Wireless Local Area Network) communications technique is provided where a frequency synthesizer unit generates an LO (Local Oscillator) signal at a frequency between both frequency bands and two downconversion units and/or two upconversion units are provided. One of the units performs conversion between the LO signal and an IF (Intermediate Frequency) signal while the other conversion takes place between the IF signal and a zero-IF or low-IF signal. Signal processing is performed on the zero-IF or low-IF signal.

Abstract: A multi-band low noise amplifier (LNA) includes multiple low noise amplifying circuits configured to selectively operate in corresponding frequency bands. The low noise amplifying circuits include corresponding amplifying units and degenerating units. The degenerating units include first inductors, which are arranged in loop patterns isolated from each other on a same layer, such that one first inductor surrounds at least one other first inductor. A current flows through a selected first inductor included in a selected low noise amplifying circuit of the low noise amplifying circuits.

Abstract: A circuit package providing voltage isolation includes at least one output and first circuitry located in a substrate of the circuit package for performing an operation. A transformer located in the metal layers of the circuit package provides voltage isolation between the first circuitry and the at least one output.

Abstract: An apparatus and method for removing a transmission leakage signal are provided. The apparatus includes: a directional coupler connecting an antenna to a transmission path and a reception path; and a reflection coefficient adjustment unit outputting a reflection signal to the reception path, the reflection signal having the same amplitude as and opposite phase to a first transmission leakage signal generated from the transmission path and input to the reception path and a second transmission leakage signal reflected by the antenna and input to the reception path.

Abstract: A waveform reconstruction circuit receives an rf signal from an antenna, digitizes it, and then generates an undistorted reconstructed waveform. The reconstructed waveform can then be conventionally mixed and demodulated to extract useful signal information with enhanced receiver fidelity and sensitivity.

Abstract: An impedance matching system, a network analyzer having the same, and an impedance matching method thereof are disclosed. The system includes a signal extractor to extract an output signal and an input signal having at least a portion of an electric current outputted through a load and at least a portion of an electric current inputted through the load, respectively, a processor to process the output signal and the input signal extracted from the signal extractor, a comparator to compare a phase and an amplitude of the output signal with a phase and an amplitude of the input signal, respectively, a coefficient calculator to calculate a reflection coefficient using the comparative result provided from the comparator, and a circuit controller to generate a signal for controlling a matching circuit, which matches the phase and the amplitude of the output signal with the phase and the amplitude of the input signal, respectively, so as to ensure the reflection coefficient to have a predetermined value.

Abstract: A receiver has an offset application circuit for applying a known offset to an input signal, and a decision circuit for comparing the offset-applied input signal with a reference voltage. The level of the input signal is determined based on the known offset and on the result output from the decision circuit. With this configuration, a large common mode voltage can be eliminated in a circuit used for signal transmission.

Abstract: Exemplary embodiments include an antenna for receiving electromagnetic radiation in a broadcast radiation band and a near-field radiation band to generate a Radio Frequency (RF) signal. A coupling element couples the RF signal to a first port and at least one additional port, which may be a second port and a third port. A wireless power receiver on the first port includes a rectifier for converting the RF signal to a DC signal when the antenna couples to radiation in the near-field radiation band in a coupling-mode region of the antenna. A near-field communication transceiver includes circuitry for communicating information on the antenna in the near-field radiation band when the coupling element couples the second port to the RF signal. A broadcast receiver on the third port includes circuitry for receiving and tuning the broadcast radiation band when the coupling element couples the third port to the RF signal.

Abstract: A programmable antenna assembly includes a configurable antenna structure, a configurable antenna interface, and a control module. The configurable antenna structure includes a plurality of antenna elements that, in response to an antenna configuration signal, are configured elements into at least one antenna. The configurable antenna interface module is coupled to the at least one antenna and, based on an antenna interface control signal, provides at least one of an impedance matching circuit and a bandpass filter. The control module is coupled to generate the antenna configuration signal and the antenna interface control signal in accordance with a first frequency band and a second frequency band such that the at least one antenna facilitates at least one of transmitting and receiving a first RF signal within the first frequency band and facilitates at least one of transmitting and receiving a second RF signal within the second frequency band.

Abstract: A broadcasting signal processing apparatus and a control method thereof are provided. The broadcasting signal processing apparatus includes a wireless antenna; a radio frequency (RF) module which tunes a broadcasting signal; a variable part which adjusts an impedance to match an impedance of the wireless antenna with an impedance of the RF module; and a controlling part which pre-stores impedance variable values for impedance matching and which controls the variable part to adjust the impedance based on one of the pre-stored impedance variable values corresponding to a broadcasting frequency of a selected broadcasting channel. The method includes tuning to a broadcasting frequency; determining whether an impedance used to match a wireless antenna with a radio frequency (RF) module is different from an impedance variable value; and if the impedance is different, adjusting the impedance.

Abstract: A system, method, and electrical circuit comprises a LNA signal line path comprising a LNA and a first signal mixer operatively connected to the LNA. The circuit further comprises an attenuator signal line path comprising an attenuator and a second signal mixer operatively connected to the attenuator; a radio frequency (RF) power detector operatively connected to an output of each of the LNA and the attenuator, wherein the RF power detector is adapted to vary a front end power gain of the electrical circuit; and logic circuitry operatively connected to the RF power detector, wherein the logic circuitry is adapted to (i) select transmission of a signal through only one of the LNA signal line path or the attenuator signal line path, and (ii) output the selected signal.

Abstract: A radio frequency (RF) transmit/receive switch. The transmit/receive switch comprises an impedance matching circuit and a voltage scaling circuit. The impedance matching circuit matches an incoming RF signal to a low noise amplifier and an outgoing RF signal from a power amplifier. The voltage scaling circuit, coupled to the impedance matching circuit, the power amplifier, and the low noise amplifier, attenuates the outgoing RF signal to a scaled signal within a breakdown voltage of a transistor device in the low noise amplifier during transmission of the outgoing RF signal.

Abstract: A radio system for the reception of broadcast signals is provided that includes two antennas picking up radio signals and two signal receivers receiving the radio signals, the two antennas and the two receivers operating in diversity operating modes. The radio system further includes an antenna switching unit for creating a connection between the receivers and the antennas and a control unit for controlling the antenna switching unit and selecting the operating mode according to predetermined diversity control criterion.

Abstract: An apparatus comprising a functional circuitry on a first die. Said function circuitry configured to drive an RF voltage isolation link with an RF signal responsive to receipt of a logic signal at a first logic state. Control circuitry modifies the frequency of the RF signal to spread harmonics to other than a fundamental frequency.

Abstract: The invention relates to systems and methods which may allow the determination of a correction factor between full scale antennas and scale antennas in order to determine the coupling loss of the full scale antennas on full scale structures based on models of the full scale structures.

Abstract: An offset cancellation scheme in which offset cancellation current is sourced into one differential branch of a driver circuit and sinked from the opposite differential branch. The source/sink arrangement allows for offset cancellation current to be introduced into the circuit, but the overall total average current remains substantially unchanged. When used in an I and Q mixer circuits, the offsets may be canceled without generating an I/Q imbalance in the I and Q mixers.

Abstract: The invention aims at providing an NRD guide transceiver not requiring a change-over switch for transmission and reception, a download system being of a simple structure and capable of downloading large-capacity data such as video data and the like in a short time using this transceiver and a download memory used in this system, said NRD guide transceiver comprising a pair of dielectric strips (154, 155) disposed between a pair of conductor plates (152, 153) arranged in parallel with each other at a specified interval, wherein Schottky barrier diodes (156, 157) are connected to the respective ends of both of said pair of dielectric strips, a low pass filter (164) is connected to a signal input terminal and a high pass filter (165) is connected to an IF output terminal.

Abstract: An RF receiver system is provided having a plurality of selectable antennas. The system includes a receiver for receiving RF signals from one of the plurality of antennas at a time. The receiver includes processing circuitry for processing the RF signals and generating a control signal to control selection of one of the antennas at a time. The system further includes a switched diversity module having a plurality of switches coupled to the plurality of antennas for selecting one of the antennas at a time. The switched diversity module further includes logic receiving the control signal generated by the receiver and generating logic output signals to control selection of one of the antennas at a time.

Abstract: The invention relates, inter alia, to a wireless portable device for radio communication, comprising at least one antenna element (1210), at least one ground-plane (1250), radio frequency communication circuitry (1310) and at least one matching network (1320). The device is arranged for communication involving, at least, receiving and processing a signal in accordance with a communication system having a bandwidth with a lower frequency limit (fmin) and an upper frequency limit (fmax). The antenna element is a non-resonant antenna element for frequencies from said lower frequency limit (fmin) up to said higher frequency limit (fmin). Another aspect of the invention involves two antenna elements (2001, 2002) tuned around two different central frequencies within a frequency band, and a switch (2003) for selectively operatively connecting one of said at least two antenna elements to a radio frequency communication circuitry (2000).

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.

Abstract: An integrated receiver with channel selection and image rejection substantially implemented on a single CMOS integrated circuit is described. A receiver front end provides programable attenuation and a programable gain low noise amplifier. Frequency conversion circuitry advantageously uses LC filters integrated onto the substrate in conjunction with image reject mixers to provide sufficient image frequency rejection. Filter tuning and inductor Q compensation over temperature are performed on chip. The filters utilize multi track spiral inductors. The filters are tuned using local oscillators to tune a substitute filter, and frequency scaling during filter component values to those of the filter being tuned. In conjunction with filtering, frequency planning provides additional image rejection. The advantageous choice of local oscillator signal generation methods on chip is by PLL out of band local oscillation and by direct synthesis for in band local oscillator.

Abstract: A stage is provided for a receiver of a wireless device. The stage comprises a matching network that separates amplified signals of interest received from an amplifier from amplified unwanted signals received from the amplifier in conjunction with additional downstream filters. The stage also comprises a signal path that comprises components for receiving and processing the amplified signals of interest, and a shunt path that comprises components for adjusting reflected energy sent back to the amplifier for limiting the output swing of the amplifier in a frequency band corresponding to the amplified unwanted signals.

Abstract: An arrangement for dividing the output signal of the antenna filter of a radio receiver to two different paths, such as two parallel low-noise amplifier branches of a base station. The divider circuit is physically integrated into a resonator-type antenna filter (RXF). This takes place by placing some conductors (332, 333) of the divider inside some conductive part of the filter structure or the resonator cavity and by using the coupling conductor (331) of the output resonator as part of the input line of the divider at the same time. As the divider is used a Wilkinson divider. Due to the arrangement, a transmission line between the antenna filter and the divider becomes unnecessary, and the dielectric losses of the divider are reduced as compared to the prior art, in which case correspondingly inferior noise qualities can be allowed for low-noise amplifiers.

Abstract: A method and apparatus for transmitting data from a first node to a second node of a communication system are provided. The method includes, in a first mode of operation, transmitting data via a first communication channel in which the power level of the channel at the first node is not indicated to the second node, and in a second mode of operation transmitting the data via said first communication channel and indicating the power level of the channel at the first node to the second node.

Abstract: A GPS receiver depends on CMOS technology for both its GPS digital signal processing (DSP) and radio frequency (RF) stages. A resulting increase in RF input noise generated by the CMOS RF input is overcome by placing the antenna on-chip or on a lid of an application specific integrated circuit (ASIC) that includes the DSP and RF stages, and matching it for the best noise figure rather than the best impedance match. The on-chip antenna is matched to the natural high impedance of the CMOS RF input without requiring matching networks that can attenuate already weak signals. Using CMOS technology for both the GPS DSP and RF stages eliminates the need for level shifts between what would otherwise be a 3-volt RF section and a 1.2-volt DSP section.

Abstract: A waveform reconstruction circuit receives an rf signal from an antenna, digitizes it, and then generates an undistorted reconstructed waveform. The reconstructed waveform can then be conventionally mixed and demodulated to extract useful signal information with enhanced receiver fidelity and sensitivity.

Abstract: A phase rotator for a Cartesian feedback power amplifier in a transmitter final stage contains an integrated voltage controlled tunable resonant circuit accomplishing band-pass filtering at a center frequency selected by local oscillator (LO) coarse trim control signals. The voltage controlled tunable resonant circuit attenuates input signal harmonic levels at large fractional bandwidths for the downconverter in the feedback LO path without setting a large number of poles in the band-pass filter. The binary-weighted course trim value for controlling the gain of the LO sets a bank of voltage-variable capacitors (VVC) in the voltage controlled tunable resonant circuit to control the center frequency in each of two 2-pole band-pass filters, creating a composite 4-pole band-pass filter at the input of a poly-phase quadrature generation circuit in the feedback LO path.

Abstract: A distributor arranged between a tuner module and an antenna, the tuner module including a first input portion and a second input portion for inputting a satellite broadcast signal transmitted from an artificial satellite and a ground broadcast signal transmitted from a ground base station respectively, and the antenna receiving either one of the broadcast signals. The distributor includes a first connector portion connected to the antenna; a second connector portion connected to the first input portion; a third connector portion connected to the second input portion; and a junction connecting portion distributing the signal inputted to the first connector portion to the second and the third connector portions. A drive voltage of the antenna inputted from the first input portion is outputted to the antenna. The voltage outputted to the antenna is fed back to the second input portion through the junction connecting portion and the third connector portion.