231results about "Amplifiers wit coupling networks" patented technology

A current sensing system for a magnetic resonance imaging (MRI) scanner operating at 1H and 31P resonant frequencies includes a dual-tuned RF coil with a network of up to two parallel quarter-wavelength transmission lines, each integrated with a PIN diode-coupled shunt capacitor. A multiple half-wavelength transmission line is employed with a corresponding pair of shunt capacitors and PIN diodes. A quarter-wavelength transmission line, coupled with a power amplifier through a matching network of shunt capacitors and PIN diodes, is also included. The configuration parameters are designed to tune the system to the fundamental frequency and its first odd multiple, correlating with the 1H resonant frequency, and to the 31P resonant frequency. The system accurately senses coil currents by detecting voltage variations in the matching network, thereby facilitating precise current measurements at the tuned resonant frequencies without the need for external sensors.

An impedance matching network for a radio frequency (RF) transmission system can include first port for coupling to a first transistor differential pair. The network can further include a second port for coupling to a second transistor differential pair. The network can further include a matching network connected to the first port and the second port, the matching network comprised of a pair of coupled lines. Other aspects are described.

A Doherty power amplifier (PA) includes a main amplifier, an auxiliary amplifier, a first inductor coupled between an output of the main amplifier and a first node, a second inductor coupled between an output of the auxiliary amplifier and the first node, and a third inductor coupled between a supply rail and the first node. The Doherty PA also includes a first capacitor coupled between the output of the main amplifier and a ground, a second capacitor coupled between the output of the auxiliary amplifier and the ground, and an impedance matching circuit coupled between the output of the auxiliary amplifier and an output of the Doherty PA.

A hybrid coupler has a first port, a second port, a third port, and a fourth port to which a load is connected. An input signal distributor distributes a first input signal that is a radio frequency signal into a second input signal and a third input signal. The second input signal is inputted to a balanced amplifier. The balanced amplifier outputs two amplified radio frequency signals with a phase difference of 90° from each other from two output ends, one of which is coupled to the first port and another one of which is coupled to the second port. The control amplifier amplifies the third input signal and outputs the amplified third input signal from an output end. The output end of the control amplifier is coupled to the third port without any circuit component affecting impedance matching disposed in between.

A load modulation amplifier is disclosed having a first amplifier and a second amplifier. An input quadrature coupler and an output quadrature coupler are coupled between the first amplifier and the second amplifier. A splitter has a first splitter output, a splitter input coupled to a signal input, and a second splitter output coupled to a second port of the input quadrature coupler, and a variable attenuator is coupled between the first splitter output and a first port of the input quadrature coupler. An attenuation controller has a controller output that is coupled to an attenuation control input of the variable attenuator, wherein the attenuation controller autonomously generates a control signal in response to a power sample signal in proportion to a radio frequency signal received at the radio frequency signal input.

A Differential Input, Single-ended Output Quadrature Hybrid Coupler (DISO-QHC) is based on baluns, one or two phase shifters, and a Wilkinson combiner. The DISO-QHC is configured to receive two differential, quadrature RF signals from differential PAs and output a combined, single-ended RF signal to drive an antenna element or subarray. Impedance matching transformers configured as baluns perform the differential-to-single-ended conversion and PA output impedance matching, without any requirement on coupling factor. One or two phase shifting circuits align the single-ended, quadrature RF signals in phase. A Wilkinson combiner circuit combines the power of the outputs of the phase shifting circuits. Area and losses are reduced by combining components from the phase shifting circuits with the baluns, and with the Wilkinson combiner circuit (which is implemented with lumped-reactance components rather than transmission lines). The DISO-QHC does not have a specific isolation port, but the isolation resistor within the Wilkinson combiner dissipates the differential and reflected signal from the PAs resulting from the incoming wave reflected from the antenna. The DISO-QHC is compatible with a LMBA functionality. By injecting a current at the center point of the isolation resistor in the Wilkinson combiner, the impedance at PA ports can be modulated.

A full duplex carrier aggregation, RF, wireless transceiver (100) is disclosed. The RF wireless transceiver (100) comprises: a single transmit and receive antenna (110) for: performing an RF transmit based on a transmit signal and generating a receive signal based on an RF receive; the invention relates to a power amplifier (100) comprising a plurality of cascaded quadrature balanced power amplifier (QBPA) modules (120a to n), in which each QBPA module (120a to n) comprises a transmit signal port (121a, b), an antenna port (122a, b), a receive signal port (123a, b), and a cancel signal port (124a, b), and a plurality of cascaded quadrature balanced power amplifier (QBPA) modules (120a to n), in which each QBPA module (120a to n) comprises a transmit signal port (121a, b), an antenna port (122a, b), a receive signal port (123a, b), and a cancel signal port (124a, b). The antenna port (121a) of the first QBPA module (120a) is connected with the antenna (110); and the antenna port (121b) of the second QBPA module (120b) is connected with the signal receiving port of the first QBPA module (120a). Each QBPA module (120a to n) is configured to: receive a transmit input signal at the transmit signal port (121a, b); receiving a receive signal at the antenna port (122a, b); receiving a cancellation input signal at the cancellation signal port (124a, b); generating a transmit signal based on the transmit input signal and outputting the transmit signal through the antenna port (122a, b); a cancellation signal is generated based on the cancellation input signal, and the cancellation signal and the reception signal are output at the reception signal port (123a, b).

The present disclosure provides a power amplifier system. The system includes: a differential power divider configured to perform power distribution on an input signal and output a plurality of sub-differential signals; a plurality of branch differential amplifying circuits, wherein each branch differential amplifying circuit of the plurality of branch differential amplifying circuits is configured to amplify a corresponding sub-differential signal; and a differential synthesizer connected with the plurality of branch differential amplifying circuits and configured to perform power synthesis on the plurality of sub-differential signals to obtain a synthesized differential signal; wherein an operating state of at least one of the plurality of branch differential amplifying circuits is different from that of the other branch differential amplifying circuits of the plurality of branch differential amplifying circuits.

Methods and apparatus are provided. In an example aspect, an amplifier protection circuit is provided. The amplifier protection circuit comprises an input for receiving a signal from a first amplifier, and an isolation circuit between the input and an output of the amplifier protection circuit. The isolation circuit is configured to sense a backward signal propagating from the output of the amplifier protection circuit towards the input to provide a sensed signal, and to provide at least one cancellation signal based on the sensed signal to at least partially cancel the backward signal.

A solid-state power amplifier architecture comprises a plurality of switched mode with gate driver circuit and digital input power amplifier modules, and a digital control circuit configured to drive the plurality of switched mode with digital input power amplifier modules with corresponding digital signals, whereby the digital control circuit is further configured for adjusting the phase of the digital signals relative to each other. The solid-state power amplifier architecture further comprises an RF or MW power combiner with load terminations that are equipped each with a corresponding directional coupler that is configured to sample the signal into the load terminations, and a feedback system implemented in the digital control circuit that uses the sample signals to adjust the phase of the digital signals to each other according to a method that maximises the efficiency of the power combination by minimising the signal into the load terminations by adjusting the phase of the digital signals into the power amplifier modules relative to each other.

The present invention provides a semiconductor device. The semiconductor device includes a transistor element, multiple input wires, and multiple output wires. The transistor element has multiple input pads arranged along one side and multiple output pads arranged along another side opposite the one side. The multiple input wires are respectively connected to the input pads. The multiple output wires are respectively connected to the output pads and have a longer wire length than the multiple input wires. Adjacent input wires are arranged parallel to each other, while adjacent output wires are arranged non-parallel to each other.

An amplifier includes a signal input terminal for inputting an input signal; a voltage input terminal for inputting a power supply voltage; an amplification circuit for generating an amplified input signal based on the input signal, wherein the amplified input signal has a fundamental frequency, a first harmonic, and a second harmonic, wherein the first harmonic is the second harmonic of the fundamental frequency, and the second harmonic is the third harmonic of the fundamental frequency; a harmonic filter circuit coupled between the voltage input terminal and the amplification circuit for filtering the first harmonic and the second harmonic; and a signal output terminal coupled to the harmonic filter circuit for outputting an output signal based on the amplified input signal.

In the power amplifier device, broadband operation of the high-frequency power amplifier circuit is realized. The power amplifier device (100A) includes: a power amplifier circuit (1) for amplifying high-frequency input signals; a first impedance matching circuit (2) for impedance matching of the output signal of the power amplifier circuit (1); a second harmonic termination circuit (3) disposed on the output side of the first impedance matching circuit (2), which outputs a high-frequency signal from the input terminal as a high-frequency signal by reflecting at least a portion of the even and odd harmonics contained in the signal input from the first impedance matching circuit (2), and outputs a high-frequency signal containing the fundamental wave, the remaining even harmonics and the odd harmonics from the output terminal; and a filter (4) disposed after the second harmonic termination circuit (3) to attenuate at least a portion of the even and odd harmonics and output a high-frequency signal containing the fundamental wave, the remaining even harmonics and the odd harmonics.

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate, and a class-F amplifier (500) according to an embodiment of the present disclosure may comprise: an input matching network (IMN) (510) including an input harmonic tuning network (511) and an input fundamental matching network (512); a power amplifier (PA) (520) electrically connected to the input matching network (510); and a class-F output matching network (F-OMN) (530) electrically connected to the power amplifier (520).

A Doherty power amplifier includes a first amplifier with a first output capacitance, a second amplifier with a second output capacitance, a reconfigurable impedance inverter, and a variable output impedance transformer. The reconfigurable impedance inverter includes a combining node and first, second, and third variable networks. The first variable network and the first amplifier output capacitance establish a first amplifier effective output capacitance that is less than the first output capacitance. The second variable network provides a series inductance between the first amplifier output and the combining node. The third variable network and the second amplifier output capacitance establish a second amplifier effective output capacitance that is less than the second output capacitance. The output impedance transformer includes a fourth variable network that establishes a combining node impedance. The first, second, and third variable networks and the output impedance transformer may be reconfigured based on traffic loading conditions.

Systems, devices, and methods are described to provide an improved current mirror operational transconductance amplifier (OTA). Improved OTAs may include an input circuit arranged to receive a differential voltage input, a load circuit arranged to measure a positive branch current and negative branch current from the input circuit, a bias circuit arranged to determine a bias voltage based on the negative branch current, a folded current branch circuit arranged to generate an adaptive bias current and a pass transistor configured to adjust an amount of the adaptive bias current based on the bias voltage, and a push-pull output circuit configured to sink current based on the adjusted adaptive bias current. The folded current branch circuit may generate the adaptive bias current based on the measured negative branch current. The output circuit may source current based on the measured positive branch current. Advantageously, most transistors may be of minimum size.

Embodiments of the present application relate to an amplifying device and a transmitter. An amplifying device and a transmitter capable of compensating for a parasitic component of a circuit element without complicating a circuit structure are provided. The amplifying device includes a first amplifier that performs an amplifying operation on a signal; N-1 second amplifiers that perform an amplifying operation on the signal in sequence according to an amplitude of the signal in a case where the first amplifier performs the amplifying operation; N input networks connected to an input terminal that inputs the signal; N output networks connected between an output node of the first amplifier and a load connection node and connected between output nodes of the N-1 second amplifiers and the load connection node; and a first bias network that supplies a direct current bias voltage to at least one of the N output networks, an electrical length of the first bias network being less than 90 degrees.

A load modulation amplifier is disclosed having a first amplifier and a second amplifier. An input quadrature coupler and an output quadrature coupler are coupled between the first amplifier and the second amplifier. A splitter has a first splitter output, a splitter input coupled to a signal input, and a second splitter output coupled to a second port of the input quadrature coupler, and a variable attenuator is coupled between the first splitter output and a first port of the input quadrature coupler. An attenuation controller has a controller output that is coupled to an attenuation control input of the variable attenuator, wherein the attenuation controller autonomously generates a control signal in response to a power sample signal in proportion to a radio frequency signal received at the radio frequency signal input.

Described is a noise-cancellation amplifier, comprising a first inductor system with a first inductor (L1) and a second inductor (L2); a second inductor system with a third inductor (L3) and a fourth inductor (L4); a first transistor (T1) being coupled with the third inductor (L3); a second transistor (T2) being coupled with the fourth inductor (L4); and a third inductor system with a fifth inductor (L5) and a sixth inductor (L6), the fifth inductor (L5) being coupled with a gate of the first transistor (T1) and the sixth inductor (L6) being coupled with a gate of the second transistor (T2); wherein the first inductor system is inductively coupled with the second inductor system and the second inductor system is inductively coupled with the third inductor system. In this way, a noise cancellation effect of the noise cancellation amplifier may be improved.

A splitter / combiner having a first port, a second port, and a third port includes a first transmission line coupled between the first port and the second port, a second transmission line coupled between the first port and the third port, a resistor coupled between the second port and the third port, and first and second capacitors each having a first terminal and a second terminal, the first terminal of the first capacitor coupled to the second port, the first terminal of the second capacitor coupled to the third port, the second terminal of each of the first and second capacitors coupled to a common node. At least one of the first capacitor, second capacitor, first transmission line, and second transmission line is adjustable during operation for varying the electrical properties of the splitter / combiner.

The invention relates to the field of radio frequency monolithic microwave integrated circuits, and discloses a distributed amplifier based on a negative feedback active terminal, and the circuit comprises grid transmission lines which are connected in sequence; the drain electrode transmission lines are connected in sequence, the output of the previous drain electrode transmission line is connected with the input of the next drain electrode transmission line, the output end of the last drain electrode transmission line is connected with the radio frequency signal output end through a second blocking capacitor, and the input end of the first drain electrode transmission line is grounded through a resistor; an amplification network N from the input end of the Nth drain transmission line to the input end of the Nth gate transmission line, where N is an integer greater than or equal to 2; and a negative feedback active terminal from the output end of the last drain transmission line to the output end of the last gate transmission line. Through the negative feedback active terminal, the thermal noise of the resistor at the low frequency is effectively reduced, so that the low-frequency noise of the distributed amplifier is greatly reduced, and the problem that the low-frequency noise of the distributed amplifier is large is solved.

A Doherty power amplifier includes a combining node is coupled to a carrier amplifier output and to a peaking amplifier output, and a reconfigurable output impedance transformer coupled between the combining node and a radio frequency (RF) output. The combining node is configured to combine an amplified carrier signal and an amplified peaking signal to produce a combined amplified signal. The reconfigurable output impedance transformer includes a phase shift element, a first variable capacitor, and a second variable capacitor. The phase shift element has an input end coupled to the combining node and an output end coupled to the RF output, and the phase shift element is configured to apply a phase shift to the combined amplified signal. The first variable capacitor is coupled to the input end of the first phase shift element, and the second variable capacitor coupled to the output end of the first phase shift element.

The present disclosure relates to the field of amplifier circuits (driver amplifiers) for electro-optical modulators, in particular for amplifying an electrical signal for driving electro-optical modulators, an amplifier circuit (101) is proposed for amplifying a signal comprising a gain amplifier (102), a distributed amplifier (103), a resistor (Rg), and a current source (104), wherein the input of the distributed amplifier is electrically connected to the output of the gain amplifier; the resistor terminates the input of the distributed amplifier; and the current source is electrically connected in parallel to the resistor. A method of setting a bias voltage of such an amplifier circuit is also proposed. Furthermore, a transmitter, in particular an optical transmitter, comprising such an amplifier circuit and a system comprising such a transmitter and a signal source are also proposed.

Certain aspects of the present disclosure relate to a signal processing circuit. The signal processing circuit generally includes: an impedance transformation circuit (404) coupled between a first node and a second node; and an attenuation circuit (402) including a first variable resistive element (408) coupled between the first node and the reference potential node and a second variable resistive element (406) coupled between the second node and the reference potential node.

A power amplifier or power amplification technique can achieve improved radio frequency (RF) performance. The power amplifier includes circuitry including a configurable impedance matching circuit and a driver circuit. The driver circuit is fabricated using a first process different than a second process. The impedance matching circuit being fabricated using the second process. Circuits in the first process can be used to partially or in whole control the tuning of the matching circuit in the second process.

Apparatus and methods for a multiclass, broadband, no-load-modulation power amplifier are described. The power amplifier (500) may include a main amplifier (532) operating in a first amplification class and a plurality of peaking amplifiers (536, 537, 538) operating in a second amplification class. The main amplifier (532) and peaking amplifiers (536, 537, 538) may operate in parallel on portions of signals derived from an input signal to be amplified. The main amplifier (532) may see no modulation of its load impedance between a fully-on state of the power amplifier (all amplifiers amplifying) and a fully backed-off state (peaking amplifiers idle). By avoiding load modulation, the power amplifier (500) can exhibit improved bandwidth and efficiency compared to conventional Doherty amplifiers.