Abstract: A power device without a package structure in a radio frequency power amplifier module and an assembly method for a radio frequency power amplifier module are provided. The radio frequency power amplification module includes the power device, a heat dissipating plate and a printed circuit board. The power device includes a carrier flange, a plurality of electronic elements and bond-wires, and the electronic elements are adhered to the carrier flange, the power device and the printed circuit board are fixed on the heat dissipating plate, the electronic elements of the power device are connected with each other through the bond-wires, and the electronic elements are directly connected to the printed circuit board through the bond-wires. The electronic elements include at least one passive device, a decoupling capacitor is disposed on the printed circuit board, and the decoupling capacitor is connected to the passive device through the bond-wires.

Abstract: Systems, devices and methods related to multi-band power amplifier. In some embodiments, a power amplifier module includes a power amplifier having an output stage and configured to receive a signal. The power amplifier module also includes a first programmable harmonic termination circuit in electrical communication with the output stage of the power amplifier. The first programmable harmonic termination circuit includes a first plurality of capacitors and a first plurality of switches, with at least one of the first plurality of capacitors being in electrical communication with at least one of the first plurality of switches. The power amplifier module further includes a controller configured to modify a configuration of the first plurality of switches of the first programmable harmonic termination circuit based at least in part on a second harmonic frequency of the signal.

Abstract: Techniques are disclosed relating to use of digital predistortion in the context of full-duplex radio. In some embodiments, an apparatus includes one or more antennas and is configured to simultaneously transmit and receive wireless signals via at least partially overlapping frequency resources using the one or more antennas. In some embodiments, the apparatus includes receive chain circuitry that is configured to process both wireless signals transmitted by the apparatus via the one or more antennas and over-the-air wireless signals from one or more other computing devices. In some embodiments, the apparatus includes one or more processing elements configured to determine one or more digital predistortion parameters based on the wireless signals transmitted by the apparatus via the one or more antennas and processed by the receive chain circuitry and apply predistortion to transmitted wireless signals based on the one or more digital predistortion parameters.

Abstract: A packaged Radio Frequency power transistor device is described, which comprises a component carrier a die comprising a semiconductor transistor having a source, a gate and a drain, wherein the die is mounted at the component carrier, a ground connection being electrically connected to the source, an output lead being electrically connected to the drain, a resonance circuit being electrically inserted between the output lead and the ground connection, and a video lead being electrically connected to the resonance circuit. The video lead is configured for being connected to a first contact of a decoupling capacitor. The ground connection is configured for being connected to a second contact of the decoupling capacitor. It is further described a RF power amplifier comprising such a packaged Radio Frequency power transistor device.

Abstract: A wideband self-envelope tracking power amplifier (PA) can use more than a 40-MHz channel bandwidth and improves the envelope bandwidth limit of a self-envelope tracking PAs by ten times. The PA uses an envelope load network, which is based on a general multi-stage low-pass filter. The envelope load network located between an RF choke inductor and main DC power supply provides a dynamically modulated PA supply voltage without using a dedicated envelope amplifier. An input terminal of the network connects a main PA via an RF choke inductor to an input of low-pass filter. An output terminal is connected to the low-pass filter via an envelope choke inductor and to a direct current (DC) power supply. A DC blocker is connected between the output of the low-pass filter and ground by a termination resistor.

Abstract: To provide an effect circuit that can give round-shaped distortion effect to a music signal. An effect circuit 1 includes a input resistor R2 that is connected to a negative input terminal of an operational amplifier U1, a feedback resistor VR1 that is provided between a positive input terminal of the operational amplifier U1 and an output terminal of the operational amplifier U1, zener diodes D1 and D2 in each of which cathodes are connected and that are provided in parallel with the feedback resistor VR1, and diodes D3 and D4 that are connected in parallel so that each cathode and each anode are connected and are provided between cathodes of the zener diodes D1 and D2.

Abstract: The embodiments described herein provide class F amplifiers and methods of operation. So implemented, the class F amplifiers can be used to provide high efficiency amplification for a variety of applications, including radio frequency (RF) applications. In general, the class F amplifiers are implemented with at least one transistor and an output matching network, where the output matching network includes a plurality of resonant circuits configured to facilitate class F amplifier operation. In addition to facilitating class F amplifier operation, the plurality of resonant circuits can also be implemented with other circuit elements to provide output impedance transformation in a way that facilitates efficient amplifier operation.

Abstract: A multi-chip package (MCP) includes semiconductor chips integrated therein. Each semiconductor chip includes: pad groups which extend in a first direction and are arranged in a second direction, and each of which includes a first metal line and a second metal line that are stacked in a third direction with an interlayer dielectric layer interposed therebetween; receivers which one-to-one correspond to the respective pad groups, and each of which includes a first input terminal coupled with the first metal line of a corresponding pad group, and an output terminal coupled with the second metal line of the corresponding pad group; and selectors, each of which selects one of a feedback signal transferred from the output terminal of a corresponding receiver and a reference voltage, and provides the selected one to a second input terminal of the corresponding receiver, in response to a chip select signal.

Abstract: A device is provided, which includes a wiring structure including a first surface and a second surface opposite the first surface. The device also includes a first semiconductor die on the first surface of the wiring structure where the first semiconductor die includes first power amplifier unit. The device further includes a second semiconductor die on the first surface of the wiring structure where the second semiconductor has a second power amplifier unit and is spaced apart from the first semiconductor die. In addition, the device includes a first input port at the second surface of the wiring structure, and a first conductor in the wiring structure to electrically connect the first input port to the first semiconductor die and the second semiconductor die.

Abstract: A low noise amplifier includes a T-type circuit, a first amplification module and a second amplification module. The T-type circuit is adapted to receive an input signal from a signal source, filters the input signal to generate a filtered signal, and is configured such that an equivalent input impedance seen into the T-type circuit matches an equivalent output impedance seen into the signal source. The first amplification module is coupled to the T-type circuit for receiving the filtered signal therefrom, and amplifies the filtered signal to generate an amplified signal. The second amplification module is coupled to the first amplification module for receiving the amplified signal therefrom, and amplifies the amplified signal to generate an output signal.

Abstract: An embodiment of a packaged radio frequency (RF) amplifier device includes a transistor and an inverse class-F circuit configured to harmonically terminate the device. The transistor has a control terminal and first and second current carrying terminals. The control terminal is coupled to an input lead of the device, and the first current carrying terminal is coupled to a voltage reference. The inverse class-F circuit is coupled between the second current carrying terminal and an output lead. The inverse class-F circuit includes a shunt circuit coupled between a cold point node and the voltage reference, where the cold point node corresponds to a second harmonic frequency cold point for the device. The shunt circuit adds a shunt negative susceptance at a fundamental frequency F0 to the inverse class-F circuit.

Abstract: A method and system for an acoustic wave band reject filter are disclosed. According to one aspect, an acoustic wave band reject filter includes a substrate and a plurality of acoustic wave band reject filter blocks. The substrate includes bonding pads formed on the substrate. Each one of the plurality of acoustic wave band reject filter blocks is fixed on a separate die. Each separate die has solder balls on a side of the die facing the substrate. The solder balls are positioned to electrically connect the bonding pads formed on the substrate to positions on each of the die.

Abstract: A circuit includes an amplifier configured to amplify an input signal and generate an output signal. The circuit also includes a tuning network configured to tune frequency response of the amplifier. The tuning network includes at least one tunable capacitor, where the at least one tunable capacitor includes at least one micro-electro mechanical system (MEMS) capacitor. The amplifier could include a first die, the at least one MEMS capacitor could include a second die, and the first die and the second die could be integrated in a single package. The at least one MEMS capacitor could include a MEMS superstructure disposed over a control structure, where the control structure is configured to control the MEMS superstructure and tune the capacitance of the at least one MEMS capacitor.

Abstract: The present disclosure includes circuits and methods for power amplifiers. In one embodiment, a main amplifier stage and peaking amplifier stage of a power amplifier receive a modulated supply voltage. The peaking amplifier stage is biased dynamically to adjust the bias of peaking stage to compensate for changes in the power supply voltage. A bias voltage may be increased as the supply voltage on the peaking stage decreases, and the bias voltage may be decreased as the supply voltage on the peaking stage increases. Accordingly, bias characteristics of the peaking stage are maintained across supply voltage variations, and the efficiency of the power amplifier is improved.

Abstract: In RF power transistors, the current distribution along edges of the transistor die may be uneven leading to a loss in efficiency and in the output power obtained, resulting in degradation in performance. When multiple parallel dies are placed in a package, distribution effects along the vertical dimension of the dies are more pronounced. A RF power device (600) for amplifying RF signals is disclosed which modifies the impedance of a portion of the respective one of the input lead and the output lead and redistributes the current flow at an edge of the transistor die.

Abstract: Apparatus and methods for power amplifier output matching is provided. In certain configurations, an output matching circuit includes a supply voltage biasing circuit electrically connected between an input node and a power high supply voltage, a second-order harmonic series resonant circuit electrically connected between the input node and a power low supply voltage, a third-order harmonic parallel resonant circuit electrically connected between the input node and a harmonic frequency grounding node, a third-order harmonic series resonant circuit electrically connected between the harmonic frequency grounding node and the power low supply voltage, and a DC blocking capacitor electrically connected between the harmonic frequency grounding node and an output node.

Abstract: A communications device may include a power amplifier having an input and an output, and a direct current (DC) feed network. The DC feed network may include a radio frequency (RF) transmission line stub having a first end coupled to the output of the power amplifier and a second end coupled to a DC feed voltage, and at least one RF shorting switch coupled between a corresponding location along the RF transmission line stub and a voltage reference. The communications device may further include a controller configured to selectively operate the at least one RF shorting switch to set an operating frequency band of the power amplifier.

Abstract: A semiconductor package includes a substrate, an RF semiconductor die attached to a first side of the substrate, a capacitor attached to the first side of the substrate, and a first terminal on the first side of the substrate. The semiconductor package further includes copper or aluminum bonding wires or ribbons connecting the first terminal to an output of the RF semiconductor die, and gold bonding wires or ribbons connecting the capacitor to the output of the RF semiconductor die. The gold bonding wires or ribbons are designed to accommodate greater RF Joule heating during operation of the RF semiconductor die than the copper or aluminum bonding wires or ribbons. Corresponding methods of manufacturing are also described.

Abstract: A power amplifier system includes an input operable to receive an original value that reflects information to be communicated and an address data former operable to generate a digital lookup table key. The power amplifier system also includes a predistortion lookup table coupled to the address data former and a power amplifier having an output and coupled to the predistortion lookup table. The power amplifier system further includes a feedback loop providing a signal associated with the output of the power amplifier to the predistortion lookup table and a switch disposed in the feedback loop and operable to disconnect the predistortion lookup table from the output of the power amplifier.

Abstract: A wireless transceiver includes at least one RF transceiver section that generates an outbound RF signal based on outbound data and that generates inbound data based on an inbound RF signal. A configuration controller configures the wireless transceiver, by configuring the wireless transceiver to identify a plurality of communication paths to a remote station, the plurality of communication paths including at least one indirect communication path through at least one intermediate station; configuring the wireless transceiver to communicate with the remote station based on a first path of the plurality of communication paths; and configuring the wireless transceiver to communicate with the remote station based on a second path of the plurality of communication paths.

Abstract: An amplifying apparatus, including an amplitude-phase conversion unit to separate an input signal into first and second signals, wherein a phase difference between the first and second signals depends on an amplitude of the input signal, a first amplifying unit, a first matching circuit including a main line and a first harmonic processing circuit, wherein a length of the line of the first harmonic processing circuit short-circuits a harmonic, a second amplifying unit, a second matching circuit including a main line and a second harmonic processing circuit, wherein a length of the line of the second harmonic processing circuit short-circuits a harmonic, and an output synthesis unit to synthesize outputs from the first and second matching circuits, wherein a distance from the first amplifying unit to the first harmonic processing circuit differs from a distance from the second amplifying unit to the second harmonic processing circuit.

Abstract: A radio that includes a transceiver to transmit and receive RF signals. The transceiver including a transmitter, a transformer, and a receiver, the transformer is coupled to and shared between the transmitter and the receiver. A resonator is formed by the combination of the transformer and capacitive elements of the transmitter and receiver.

Abstract: A capacitance amplifying circuit applied to a controller of a power convertor includes a comparison unit and a capacitance amplifying module. The comparison unit receives a feedback voltage corresponding to a load coupled to the power convertor, a dimming signal, and a reference voltage, and outputs a compensation current. The capacitance amplifying module generates an equivalent capacitor. A capacitance of the equivalent capacitor is K times to a capacitance of a reference capacitor of the capacitance amplifying module, and K is a real number greater than 1. The compensation current and the equivalent capacitor are used for determining a compensation voltage, and when the dimming signal is disabled, a closed loop within the capacitance amplifying module is changed to an open loop to keep the compensation voltage at a fixed value.

Abstract: A radio that includes a transceiver to transmit and receive RF signals. The transceiver including a transmitter, a transformer, and a receiver, the transformer is coupled to and shared between the transmitter and the receiver. A resonator is formed by the combination of the transformer and capacitive elements of the transmitter and receiver.

Abstract: Apparatus and methods for power amplifiers are disclosed. In one embodiment, a power amplifier circuit assembly includes a power amplifier and an impedance matching network. The impedance matching network is operatively associated with the power amplifier and is configured to provide a load line impedance to the power amplifier between about 6? and about 10?. The impedance matching network includes a fundamental matching circuit and one or more termination circuits, and the fundamental matching circuit and each of the of the one or more termination circuits include separate input terminals for coupling to an output of the power amplifier so as to allow the fundamental matching circuit and each of the one or more termination circuits to be separately tuned.

Abstract: A voltage driving apparatus (1) for a power amplifier, a power amplifying system, a power supply device and a communication device are disclosed. The voltage driving apparatus (1) for the power amplifier includes a voltage input module (11), a voltage output module (12), a signal input module (13), and a control module (14). The voltage output module (12) is connected to the power amplifier to provide a voltage. The signal input module (13) is configured to receive a variable input electric signal. The control module (14) is electrically connected to the voltage input module (11), the voltage output module (12), and the signal input module (13) and configured to dynamically adjust the output voltage of the voltage output module (12) according to the variable input electric signal received by the signal input module (13).

Abstract: Electronic devices with wireless communications capabilities are provided. The electronic device may include storage and processing circuitry, power amplifier circuitry, power supply circuitry, etc. The storage and processing circuitry may direct the power amplifier circuitry to operate using a desired power mode, in allocated resource blocks within a particular frequency channel, and at a given output power level. The power supply circuitry may bias the power amplifier circuitry with a power supply voltage. The electronic device may be subject to in-band emissions requirements and adjacent channel leakage requirements that restrict the power levels produced by the device on frequencies that are not allocated to the device. The electronic device may optimize the power amplifier supply voltage based on allocated resource blocks by minimizing the supply voltage to reduce power consumption while ensuring that emissions requirements are satisfied.

Abstract: A method of operating a switched-mode power supply (SMPS) for supplying power to a load circuit, which draws a supply current that varies with an input signal to the load circuit is disclosed. The method comprises monitoring the input signal and controlling the amount of accumulated energy transferred for consumption by the load circuit, in use, in accordance with the input signal.

Abstract: A multiband RF power amplifier includes a first band RF amplifier circuit, a second band RF amplifier circuit and a second band power detection circuit. The second band RF amplifier circuit subjects an RF input signal having a frequency band to power amplification and generates an RF amplifier output signal. The input terminal of the second band power detection circuit is coupled to the output of the second band RF amplifier circuit. The second band power detection circuit detects a harmonic component that is a whole number multiple of a fundamental wave component of the RF amplifier output signal, and generates a detected signal indicating the fundamental wave component. The second band power detection circuit includes an input circuit, which detects the harmonic component, and an output circuit, which generates the detected signal.

Abstract: A microwave semiconductor amplifier includes a semiconductor amplifier element, an input matching circuit and an output matching circuit. The semiconductor amplifying element includes an input electrode and an output electrode and has a capacitive output impedance. The input matching circuit is connected to the input electrode. The output matching circuit includes a bonding wire and a first transmission line. The bonding wire includes first and second end portions. The first end portion is connected to the output electrode. The second end portion is connected to one end portion of the first transmission line. A fundamental impedance and a second harmonic impedance seen toward the external load change toward the one end portion. The second harmonic impedance at the one end portion has an inductive reactance. The output matching circuit matches the capacitive output impedance of the semiconductor amplifying element to the fundamental impedance of the external load.

Abstract: A tunable wide band driver amplifier is disclosed. In an exemplary embodiment, an apparatus includes a first band selection circuit selectively connected between an output terminal of an amplifier and a circuit ground. The first band selection circuit configured to adjust an amplification band from a first frequency band to a second frequency band. The apparatus also includes a first harmonic reduction circuit selectively connected between the first band selection circuit and the circuit ground and configured to reduce 2nd harmonic frequencies associated with the first frequency band when the amplification band is set to the first frequency band.

Abstract: A tunable inter-stage matching circuit that can improve performance is described. In an exemplary design, an apparatus comprises a driver amplifier and a power amplifier. The apparatus may further include an inter-stage matching circuit tunable in discrete steps for matching impedances between the driver amplifier and the power amplifier. The tunable inter-stage matching circuit may include a bank of capacitors, each capacitor of the bank coupled in series with a switch for coupling the capacitor to a ground voltage.

Abstract: Methods of turning on and/or turning off amplifier segments in a scalable periphery amplifier architecture are described in the present disclosure. The turning on and/or turning off the amplifier segments according to the various embodiments of the present can reduce spectral splatter in adjacent channels. In some embodiments, amplifier performance and efficiency can be improved by dissipating heat more uniformly.

Abstract: Methods of turning on and/or turning off amplifier segments in a scalable periphery amplifier architecture are described in the present disclosure. The turning on and/or turning off the amplifier segments according to the various embodiments of the present can reduce spectral splatter in adjacent channels. In some embodiments, amplifier performance and efficiency can be improved by dissipating heat more uniformly.

Abstract: A low-noise amplifier (LNA) filter for use with global navigation satellite system (GNSS) devices is disclosed. A first LNA stage, which is configured to connect to an antenna configured to receive GNSS signals, includes an LNA. A second LNA stage, which is connected to the output of the first LNA stage, has a surface acoustic wave (SAW) filter and an LNA. A third LNA stage, which is connected to the output of the second LNA stage, also has a SAW filter and an LNA.

Abstract: A receiver is described. The receiver includes a first amplifier on an integrated circuit. The receiver also includes a second amplifier on the integrated circuit. The receiver further includes a first inductor coupled to the first amplifier. The receiver also includes a second inductor coupled to the second amplifier. The receiver further includes a first capacitor coupled to the first inductor, the second inductor, and to ground. The first capacitor is shared between a first matching network for the first amplifier and a second matching network for the second amplifier.

Abstract: An analysis technique for (Doherty) amplifiers having a main amplifier branch and at least one peak amplifier branch. For a given input power level and assumed amplifier impedance levels, an output power level and phase response are obtained for each active device using appropriate load-pull data based on the impedance levels. The performance of the amplifier is analyzed based on the impedance levels, output power levels, and phase responses to generate updated impedance levels. The analysis is repeated until the updated impedance levels converge on steady state values. The analysis can be repeated for different input power levels. Main and peak output matching networks for the amplifier can be designed by iteratively adjusting impedance levels for the networks using appropriate load-pull contours. For the design and analysis phases, the load-pull contours include Class-AB data for the main amplifier device and Class-C data for the peak amplifier device.

Abstract: Systems and methods are provided for amplifying multiple input signals to generate multiple output signals. An example system includes a first channel, a second channel, and a third channel. The first channel is configured to receive one or more first input signals, process information associated with the one or more first input signals and a first ramp signal, and generate one or more first output signals. The second channel is configured to receive one or more second input signals, process information associated with the one or more second input signals and a second ramp signal, and generate one or more second output signals. The first ramp signal corresponds to a first phase. The second ramp signal corresponds to a second phase. The first phase and the second phase are different.

Abstract: An amplifying circuit for receiving a signal in a wireless network includes an amplifier and two switches. The amplifier includes an isolation switch having a gate connected to a control signal for activating the isolation switch transistor in a bypass mode and a source/drain connected to the input for receiving the signal and the other source/drain connected to the gate of an amplifier transistor. The amplifier also includes a bypass transistor having a gate connected to a control signal for activating the bypass transistor in a bypass mode. The bypass switch is connected in parallel with the series combination of the isolation switch and amplifier between the input and output, enabling the received signal to bypass the amplifier. In the bypass mode, the isolation switch prevents RF energy from voltage modulating the gate of the amplifier transistor gate thus reducing undesirable distortion and harmonics from the amplifier.

Abstract: The present invention reduces the size of a power detection circuit. An RF power amplifier includes an RF amplifier circuit and a power detection circuit. The RF amplifier circuit subjects an RF input signal having a predetermined frequency band to power amplification and generates an RF amplifier output signal. The input terminal of the power detection circuit is coupled to the output of the RF amplifier circuit. The power detection circuit detects a harmonic component having a harmonic frequency that is a whole number multiple of the frequency of a fundamental wave component of the RF amplifier output signal, and generates at an output terminal a detected signal indicative of the signal level of the fundamental wave component of the RF amplifier output signal. The power detection circuit includes an input circuit, which detects the harmonic component, and an output circuit, which generates the detected signal at the output.

Abstract: A power circuit includes a RF transistor and an input match network coupled to an input to the RF transistor and to an input to the power circuit. The input match network includes a resistor, an inductor and a first capacitor coupled together in series between the input to the RF transistor and a ground, and a second capacitor coupled in parallel with at least the resistor. The value of the second capacitor is selected so that the resistor is bypassed over at least a portion of the high frequency range of the power circuit.

Abstract: A circuit, a method and an apparatus, are described. A radio frequency (RF) signal received from a transmission line is provided to the source of a transistor in a common-gate amplification circuit. A series resonance connected to the source provides a low impedance path to ground for interfering RF components in the RF signal. The series resonance is tuned to provide a high impedance to a band of frequencies centered on a frequency of interest and to shunt interfering RF components outside the band of frequencies centered on the frequency of interest. The interfering RF components may include a harmonic of the frequency of interest.

Abstract: An impedance matching network for a radio frequency (RF) amplifier includes multiple stages connected to each other in a first to last order. A first stage produces an RF output signal, and a last stage receives an RF input signal. Each stage includes a first inductor connected to produce an output signal, a second inductor connected to receive an input signal from a next stage, a capacitor connected between the first and second inductors and a ground. In addition, each stage other than the first stage further includes a first switch to by-pass the first and second inductors, a second switch connected between the first and second inductors and the ground, and a controller for controlling, the first and second switches to select a particular power level of a set of power levels.

Abstract: Embodiments of circuitry, which includes an operational transconductance amplifier and a passive circuit, are disclosed. The passive circuit is coupled to the operational transconductance amplifier. Further, the passive circuit receives an input signal and the operational transconductance amplifier provides an output current, such that the passive circuit and the OTA high-pass filter and integrate the input signal to provide the output signal.

Abstract: A highly efficient, high control bandwidth and high-speed power supply with a linear driver and a switching regulator for regulating an output based on a control signal. The linear driver has a first input for receiving the control signal and a second input connected to the output for receiving negative feedback. The driver's output is controlled by its two inputs and has a capacitor connected in series with it to generate a capacitor voltage VC responsive to the DC and low frequency components in the driver's output. The switching regulator has a control input and a regulator output connected in a regulator feedback loop. The control input receives capacitor voltage VC and the regulator feedback loop minimizes capacitor voltage VC. Thus, switching regulator takes over the generation of DC and low frequency components, while the linear driver provides high frequency output current components.

Abstract: A radio frequency power amplifier includes: an amplifying element which amplifies an input signal and outputs the signal from an output terminal; and an output load circuit which includes a first resonant circuit and a second resonant circuit that are connected to the output terminal. The first resonant circuit has a resonance frequency higher than the frequency of the second harmonic of the input signal, and the second resonant circuit has a resonance frequency lower than the frequency of the third harmonic of the input signal. The output load circuit has such an impedance looking from the output terminal that a phase of a reflection coefficient at the second harmonic of the input signal is greater than 180 degrees and less than 360 degrees, and a phase of a reflection coefficient at the third harmonic of the input signal is greater than 0 degrees and less than 180 degrees.

Abstract: In RF power transistors, the current distribution along edges of the transistor die may be uneven leading to a loss in efficiency and in the output power obtained, resulting in degradation in performance. When multiple parallel dies are placed in a package, distribution effects along the vertical dimension of the dies are more pronounced. A RF power device (600) for amplifying RF signals is disclosed which modifies the impedance of a portion of the respective one of the input lead and the output lead and redistributes the current flow at an edge of the transistor die.

Abstract: The present invention provides a circulator power amplifier circuit and a connection method thereof. Wherein, the circulator power amplifier circuit includes a power amplifier, a circulator, a power load and a load. An output end of the power amplifier is connected to an input end of the circulator, the load is connected to an output end of the circulator and the power load is connected to the load end of the circulator, wherein, the circulator is an N-stage circulator or an M-port circulator, where both N and M are integers greater than one. The above circulator power amplifier circuit connected through using the circulator power amplifier circuit connection method increases the isolation for the circulator, and it is of great significance in terms of improving a standing wave of the power amplifier, ensuring stability of specification, preventing mismatch damages of the power amplifier and increasing reliability of the power amplifier.

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.

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.