436results about "Amplifiers wit coupling networks" patented technology

The present disclosure discloses a Doherty power amplifier, including: a quadrature coupler including a first coupled inductor and a second coupled inductor, the quadrature coupler being configured to split an input signal into a first signal and a second signal; a first amplifier circuit, configured to amplify the first signal; a second amplifier circuit, configured to amplify the second signal; and a load modulation network, which is an output voltage-combined Doherty load modulation network using a T equivalent model. An overlapping part of the coupled inductors is used to provide distributed parasitic capacitance, thereby eliminating the need to set an additional capacitor in the quadrature coupler, and therefore reducing an area. Through the T equivalent model, a quarter-wavelength transmission line is equated to the load modulation network of the embodiments of the present disclosure, multiple inductors are combined into transformers with small areas.

The invention discloses a power synthesis amplifier which comprises two power amplification structures, and each power amplification structure is composed of an input matching circuit, a driving stage amplifier DA, an inter-stage matching circuit, a power stage amplifier PA and an output matching circuit. The input end of the power synthesis amplifier is connected by a T-junction power distribution network; the output end of the power synthesis amplifier is connected with the T-junction power synthesis network. The output power of the power amplifier is improved by adopting a two-path synthesis technology, specifically, the power amplifier can be expanded to multiple paths according to needs, and an output power synthesis network adopts a current type synthesis network, so that the amplitude-phase balance of two paths of output signals and the current processing capability of a circuit are ensured, and the output efficiency is improved; the output-stage matching circuit adopts a transformer with a high coupling coefficient to reduce signal loss, the input and inter-stage matching networks adopt a transformer with a low coupling coefficient to play a role in expanding bandwidth, and the multi-stage matching circuit can be widely applied to the technical field of mobile communication and radar detection.

The invention discloses an ultra-wideband reconfigurable power amplifier with an adaptive network. The ultra-wideband reconfigurable power amplifier comprises a first ultra-wideband coupler, a second ultra-wideband coupler, a third ultra-wideband coupler, a fourth ultra-wideband coupler, an ultra-wideband phase shift attenuation unit, the adaptive network, a balanced power amplifier unit and a control power amplifier unit. The adaptive network comprises an ultra-wideband power divider, a frequency detection unit, a power detection unit and a data register unit. The control power amplifier unit performs active load modulation on the load impedance of the balance power amplifier unit to realize reconfiguration; the ultra wide band phase shift attenuation unit adjusts the amplitude and the phase of a radio frequency signal at the same time, and expansion of adjustable dimensions is achieved. The adaptive network detects frequency information and power information of a radio frequency input signal to realize accurate sensing of the radio frequency signal; and the adaptive network is combined with the ultra-wideband phase shift attenuation unit to realize adaptive closed-loop control of the ultra-wideband reconfigurable power amplifier.

Systems and apparatuses are disclosed that include an RF generator configured to generate RF signals having a wavelength. Amplifiers are configured to receive and amplify the RF signals from the RF generator and are separated from each other by a separation distance in a range between about 0.2 times the wavelength and about 10.0 times the wavelength. A power management system is configured to control one or more of the amplifiers based on information received that is associated with the RF signals.

Disclosed are an output network of a Doherty amplifier, a Doherty amplifier including the output network, and a design method of the Doherty amplifier. The output network includes a combination node, a main output network connected between an output port of the main amplifier and the combination node, an auxiliary output network connected between an output port of the auxiliary amplifier and the combination nod, and a merging matching network connected between the combination node and a radio frequency output port of the Doherty amplifier, where the merging matching network is configured for the node impedance at the combination node being a complex impedance, and the main output network and the auxiliary output network are configured for the node impedance matching with goal load impedances of the main amplifier and the auxiliary amplifier.

Embodiment of the disclosure relate to power splitter comprising a first separation block comprising an input and a first output, the first separation block being configured to receive an input signal via the input and forward the input signal. The power splitter further comprises a second output and a first non-linear impedance connected to the first separation block. The first non-linear impedance is configured to reflect a reflection signal of the input signal to the first output and forward a forward signal of the input signal to the second output, wherein a power ratio between the reflection signal and the forward signal is based on a configuration of the first non-linear impedance.

A power feed circuit for a circularly polarized antenna includes a synthesizing-distributing unit and a phase shift unit. The synthesizing-distributing unit distributes input signals to two paths with the same phase and same amplitude. The phase shift unit has two phase shift circuits connected respectively between the two paths distributed by the synthesizing-distributing unit and two feed points of a circularly polarized antenna. The phase shift unit outputs signals whose phase difference is 90° to the two feed points and of the circularly polarized antenna.

A balanced radio frequency power amplifier, a front-end module, and a corresponding electronic device. The balanced radio frequency power amplifier comprises a driving-stage power unit (101, 201), an inter-stage power divider (102, 202), a main path power amplifier (103, 203), an auxiliary path power amplifier (104, 204), a first output matching network (A105, A205), a second output matching network (B106, B206), and an output power combiner (107, 207). A symmetrical balance design is used for the main path power amplifier (103, 203) and the auxiliary path power amplifier (104, 204), so that the impact of the change in the antenna voltage standing wave ratio (VSWR) on the transmission power and the transmitting efficiency is overcome to the greatest extent. Moreover, a 3 dB distributed orthogonal coupler is used for the inter-stage power divider (102, 202) and the output power combiner (107, 207).

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.

The invention relates to the technical field of wireless receivers, and discloses a low-noise amplifier and a radio frequency front-end circuit, the low-noise amplifier comprises a biasing circuit and an amplifying circuit, the low-noise amplifier converts an input single-ended radio frequency signal into differential output through an MOS tube NM2 and an MOS tube NM3, and large gain is provided; secondly, external impedance matching can be better realized through single-end input, and the anti-interference capability can be enhanced through differential output; the MOS tube NM0 and the MOS tube NM1 of the low-noise amplifier are connected in a cross coupling mode, differential current imbalance can be calibrated, and noise performance is improved. Finally, the structure of the low-noise amplifier enables the noise introduced by the MOS tube NM2 to become a common-mode signal, and the introduced noise is eliminated; the mixer circuit adopts a double-balanced active mixer, common-mode signals can be well suppressed by adopting differential pair input, a local oscillator input end and a radio frequency input end are well isolated, external interference is small, and the mixer adopts a folding structure, can work under low power supply voltage and effectively reduces power consumption.

Systems and methods are related to a distributed amplification. An amplification device can include cells including a first cell and a second cell and transmission lines including a first line and a second line. The first cell is coupled to the first line, and the second cell is coupled to the second line. The first line is configured to provide a first delay related to a delay between the first cell and the second cell. The device also includes a summer including a first input coupled to the first line and second input coupled to the second line. The summer is configured to provide an output signal.

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.

The invention discloses a low-noise amplifier structure adopting multi-inductor coupling and current multiplexing, which comprises a multi-inductor coupling network and a full-nmos current multiplexing technology network, the multi-inductor coupling network is connected with the full-nmos current multiplexing technology network, the full-nmos current multiplexing technology network is used for enabling the same current to flow through a multi-stage amplifier, and the multi-stage amplifier is connected with the full-nmos current multiplexing technology network. The multi-stage amplifiers share the same power supply voltage; and the multi-inductance coupling network is used for realizing broadband maximum power transmission matching and noise coefficient matching at an input node so as to realize high power transmission and low noise coefficient. According to the invention, broadband input matching and noise matching can be realized at the same time. The invention can be widely applied to the field of radio frequency receiver front ends.

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 power amplifier arrangement (100) for amplifying an input signal (Pin) to produce an output signal (Pout) is disclosed. The amplifier arrangement (100) comprise an input port (IN) for receiving the input signal; an output transmission line (110) having a first terminal (111) and a second terminal (112); an output port (OUT) coupled to the second terminal (112) of the output transmission line (110) for providing the output signal; and a plurality N of amplifying devices (121, 122, . . . 12N) distributed along the output transmission line (110). The power amplifier arrangement (100) is configured such that the plurality N of amplifying devices are active sequentially for amplifying the input signal with increasing amplitude of the input signal.

A capacitive load, an inductive load, or a transmission line coupled to an output of a closed-loop amplifier circuit can cause undesirable oscillations in a feedback signal of the amplifier circuit. The oscillations in the feedback signal can cause the amplifier circuit to exhibit instability and unpredictable behavior. Techniques are described that allow an amplifier circuit to provide a stable response while driving a capacitive load.

The invention discloses a high-efficiency monolithic integrated balanced power amplifier, relates to the field of amplifiers, and aims to solve the problems that a coupling line used by an existing low-frequency lane bridge is relatively long and often exceeds the size of a power amplifier chip, the lane bridge can be integrated on a chip only after being coiled, and relatively high line loss is brought by the relatively long coupling line, so that the loss of the low-frequency lane bridge is relatively large, and the cost is relatively high. According to the technical scheme, the balance type power amplifier solves the problems that on one hand, the output power of the amplifier is reduced, on the other hand, the power capacity of a lange bridge is also limited, and the thickness of a monolithic integrated balance type power amplifier chip is determined by the technology and cannot be increased at will. The balance type power amplifier comprises a low-loss lange bridge circuit and a power amplifier sub-circuit; the number of the low-loss lange bridge circuits is two, the number of the power amplifier sub-circuits is two, the number of the low-loss lange bridge circuits is two, the number of the power amplifier sub-circuits is two, the low-loss lange bridge comprises parallel coupling lines, a load resistor and a capacitor, the number of the parallel coupling lines is two, each of the two parallel coupling lines is formed by arranging two or four coupling lines in parallel, and two adjacent ports of the two parallel coupling lines are connected in a pairwise crossing mode.

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.

The invention relates to the field of integrated circuit technology and the like, discloses a frequency multiplication amplification link capable of switching output of different frequency multiplication ratios, and realizes that when fundamental waves are input, signals of different frequency multiplication ratios can be output through logic switching, the bandwidth of the output signals is improved, so that the flexibility of the circuit is improved, the application scene of the circuit is widened, and the reliability of the circuit is improved. Comprising at least one stage of switchable frequency doubling / amplifier unit and at least one stage of ultra-wideband distributed amplifier, and the first stage of ultra-wideband distributed amplifier is connected in series behind the first stage of switchable frequency doubling / amplifier unit; the switchable frequency doubling / amplifier unit comprises an input matching unit, a biasing circuit, a transistor NM1, an inductor L1 and an adjustable output matching unit, the input matching unit is connected to the second end of the transistor NM1, the first end of the biasing circuit is connected with the second end of the transistor NM1, the second end of the biasing circuit is connected to a high gate voltage VGH or a low gate voltage VGL through on-off of a logic switch, and the adjustable output matching unit is connected to the second end of the transistor NM1. The third end of the transistor NM1 is connected with a power supply VDD through an inductor L1, and the third end of the transistor NM1 is connected with an adjustable output match.

The invention provides a closed-loop D-class amplifier loop, a differential closed-loop D-class amplifier loop, audio equipment and electronic equipment, the loop comprises a first-stage integrator, a second-stage integrator, a pulse width modulation module and an H-bridge module which are electrically connected in sequence, and a feedback module, the first end of the feedback module is coupled to the input end of the first-stage integrator, and the second end of the feedback module is coupled to the input end of the second-stage integrator. The second end of the feedback module is coupled to the output end of the H-bridge module, the feedback module comprises a feedback capacitor and a feedback resistor which are connected in parallel, a zero point is formed, and the zero point is designed within the frequency range between one time and two times of the gain bandwidth product. The feedback capacitor is connected to the feedback resistor in parallel, so that zero points in a loop are increased, and the system stability of the class-D amplifier is improved when the class-D amplifier is in a no-load state or the connected inductive load is large.

A method includes providing a first power from an output terminal of a balanced amplifier to a discharge chamber. The balanced amplifier includes two amplifier paths, each of which supplies a signal to a coupler. The coupler is configured to combine the signals as a function of their phase relationship and supply a power as the first power to the output terminal and / or as a second power to an isolation terminal. The method further includes setting a first phase relationship between the signals for a predefined time in order to ignite the plasma, and setting a second phase relationship in order to maintain the plasma. Under the second phase relationship, substantially an entirety of the power is supplied to the output terminal. Under the first phase relationship, a third power reflected from the discharge chamber is reflected back to the discharge chamber in a proportion large enough for the ignition.

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.

The invention provides a radio frequency power amplification circuit realized based on a low-voltage CMOS (Complementary Metal Oxide Semiconductor) process, which enables a low-voltage CMOS device not to be limited by the application of a high-power radio frequency power amplifier, can avoid the breakdown risk and is low in cost. Comprising a signal amplification output module and an anti-breakdown module. The signal amplification output module is connected with the signal input end RFIN and the signal output end RFOUT and is used for performing power amplification on a radio frequency signal input by the signal input end RFIN and outputting the radio frequency signal through the signal output end RFOUT; the signal amplification output module comprises MOS (Metal Oxide Semiconductor) tubes M1 and M2, and a cascode structure is formed through the MOS tubes M1 and M2; the signal input end RFIN is connected with the grid electrode of the MOS tube M2, and the signal output end RFOUT is connected with the drain electrode end of the MOS tube M1; and the anti-breakdown module is connected with the level input end IN and the signal amplification output module, and is used for carrying out anti-breakdown protection on the signal amplification output module according to a level signal of the level input end IN.

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).

An antenna system is provided. The antenna system includes a modal antenna disposed on a circuit board. The modal antenna includes a driven element and a parasitic element. The modal antenna is capable of operating in multiple different modes. Each of the multiple modes has a different radiation pattern. The antenna system also includes a radio frequency amplifier circuit disposed on the circuit board. The radio frequency amplifier circuit is coupled between the driven element of the modal antenna and a transmission line.

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.

A communication module able to have a favorable isolation characteristic is provided. The communication module includes a directional coupler inserted in a path extending toward an antenna from an amplifying part that amplifies a signal being input and a stub connected to the path. The directional coupler includes a main line and a sub line that couples with the main line and picks up a signal flowing through the main line. One end portion of the stub is connected to part of the path that is not the main line, another end portion of the stub is left open, and an extending direction of the stub from the one end portion to the other end portion is a direction moving away from the directional coupler.