34 results about "Driver amplifier" patented technology

The invention discloses an output matching multiplexing radio frequency front-end circuit, which belongs to the technical field of wireless communication, and comprises a power divider used for dividing an input signal into a carrier signal path and a peak signal path; a carrier signal path of the power divider is connected with a grid electrode of a first transistor in the transceiving matching network through the carrier driving amplifier and the carrier inter-stage matching network; a peak signal path of the power divider is connected with a grid electrode of a second transistor in the transceiving matching network through a peak driving amplifier and a peak inter-stage matching network; the transceiving matching network is used for switching a transmitting mode and a receiving mode; the third switch is connected with the peak driving amplifier close to the output power stage in parallel; and the input end of the low-noise amplifier is connected with the output end of the transceiving matching network and is used for amplifying signals in a receiving mode. According to the radio frequency front-end circuit provided by the invention, the transmission line length, the chip area and the system cost are reduced.

The utility model discloses a gain-adjustable driving amplifier and a power amplification circuit, and belongs to the technical field of power electronics. The input matching network and the output matching network are connected with the driving amplification module and are used for performing conjugate matching on source impedance and load impedance of the driving amplification module; and the feedback network is connected with the driving amplification module and is used for adjusting the gain of the driving amplification module according to the output power of the driving amplification module. The feedback network is arranged in the driving amplifier, and the feedback network can adjust the gain of the driving amplifier module according to the output power of the driving amplifier module, so that the technical problem that the gain of the driving amplifier cannot be dynamically adjusted can be solved.

The invention discloses a power amplifier for improving amplitude phase distortion, relates to the technical field of power amplifiers, and solves the technical problems that the improvement of the amplitude phase distortion of the power amplifier is limited, the gain is greatly reduced, and the performance of the power amplifier is influenced in the prior art. The power amplifier comprises a first-stage input matching circuit, a first-stage driving amplifier circuit, a first-stage inter-stage matching circuit, a second-stage power amplifier circuit, a second-stage output matching circuit and a linearization structure, the second-stage power amplifier circuit adopts a fully differential structure to suppress the output of a common-mode signal, and performs power output based on an A-type working state of a CASCODE structure; the linearization structure introduces a third harmonic signal of the power amplifier into the alternating current ground through a capacitor, prevents fundamental waves from flowing in, and adjusts the opening degree through an MOS tube. The CASCODE structure is connected with a linear structure, amplitude phase distortion is improved, the linearity of the circuit is improved, and gain reduction is little.

An apparatus, including: a first amplifier including: a flipped voltage follower, and a source follower coupled in parallel with the flipped voltage follower; and a load coupled to an output of the first amplifier.

This invention discloses an airborne Wi-Fi system power amplifier assembly and design method. This design relates to the field of airborne Wi-Fi system power amplifiers. The assembly comprises a dual-band power amplifier module, which provides amplification for both the transmit and receive channels. The module includes a first path and a second path. The first path includes a radio frequency port TRX1, a radio frequency transmit / receive switch K‑0, a variable gain amplifier VGA‑1, a driver amplifier D1, a final amplifier A‑1, a unidirectional transmission circulator H1, a logic switch K‑2, a final amplifier A‑3, and an antenna port ANT1. This invention addresses the issues of low-quality and high power consumption associated with Wi-Fi signal coverage in specific environments within an airborne cabin.

The invention discloses an ORU radio frequency gain adjusting system suitable for ORAN equipment. The system comprises a hardware platform, field programmable gate array logic and gain control software running on a main controller. The hardware platform comprises a digital radio frequency unit which is integrated in field programmable gate array logic, comprises a digital up-conversion module, a rest factor reduction module, a digital pre-distortion module and a digital down-conversion module, and provides a digital gain adjustment point; the radio frequency transceiving link comprises a digital-to-analog converter, an analog gain controller and a driving amplifier of the transmitting link; the receiving link comprises a low noise amplifier, a variable gain amplifier and an analog-to-digital converter; and a feedback link ADC; and the power amplifier unit comprises a final power amplifier and a bias control circuit thereof. According to the invention, high-precision and self-adaptive control of downlink (DL) and uplink (UL) gains can be realized, so that performance fluctuation caused by frequency and temperature changes and device batch differences can be compensated.

The invention discloses a low-frequency kiloampere pulse current generator which is characterized by comprising a first working power supply, a second working power supply, a pulse generator and N isolation driver amplification units, wherein the first working power supply is respectively connected with one end of the pulse generator and a first power input end of each isolation driver amplification unit; the other end of the pulse generator is connected with the signal input end of each isolation driver amplification unit; the second working power supply is connected with the second power input end of each isolation driver amplification unit; n is a positive integer. Good test adaptability can be provided for pulse loads such as a TR assembly, and the defect that standard load equipment in the market cannot simulate the instantaneous pulse current is overcome.

An acoustic noise reduction (ANR) headphone described herein has current detection circuitry that detects current consumed by an acoustic driver amplifier as a result of pressure changes due to a tapping of the headphone. Tapping may be performed to change an audio feature or operating mode of the audio system for the headphone. The current detection circuitry senses a characteristic of the current consumed by the acoustic driver amplifier that can be used to determine an occurrence of a tap event. Examples of a characteristic include an amplitude, waveform or duration of the sensed current. Advantageously, the ANR headphones avoid the need for control buttons to initiate the desired changes to the audio feature or operating mode.

This application relates to a radio communication system employing a Ku-band continuous wave power amplifier, belonging to the technical field of radio communication systems. The radio communication system includes a transmitter and a receiver. The transmitter includes an information input module, a first signal processing module, a modulator module, a power amplifier module, and a transmitting antenna. The power amplifier module includes a driver amplifier, a power divider, a waveguide combiner, and several final-stage power amplifiers. The driver amplifier is electrically connected to the modulator module and the power divider. Each of the final-stage power amplifiers is electrically connected to the power divider and the waveguide combiner. The output of the waveguide combiner is electrically connected to the transmitting antenna. This application reduces the possibility of power amplifier module burnout while ensuring normal operation of the power amplifier module, thereby ensuring the normal use of the radio communication system.

An emitter-follower driver amplifier for a power amplifier in a wireless communication device is disclosed. In one aspect, a wireless communication device may have a transmission chain with an output stage power amplifier. The load driven by the output stage power amplifier is variable. Nevertheless, an emitter-follower amplifier may be used to drive the output stage power amplifier. To assist in maintaining stable operation for the emitter-follower driver amplifier, adaptive circuitry with tunable elements that cancel capacitive changes in the emitter-follower driver amplifier is provided. When implemented in this fashion, the footprint of the amplifier chain may be substantially reduced while still providing stable operation over the frequencies of interest.

Aspects of the subject disclosure may include, for example, a common emitter stage having a differential input configured to receive an input signal from an input transmission line, a common base stage coupled with the common emitter stage and having a differential output configured to provide a differential output signal to an output transmission line, and a biasing network to bias the common base stage, the biasing network including components selected to limit common mode gain of the common base stage at relatively high frequencies of interest without affecting a differential mode gain of the common base stage. Other embodiments are disclosed.

A distributed amplifier system comprising an impedance matching network configured to match an input impedance to an output impedance of the signal source, and a DC block configured to block DC components in the input signal. A variable gain amplifier adjusts the gain applied to the input signal based on a gain control signal to generate a gain adjusted signal. An emitter follower circuit receives and processes the gain adjusted signal to introduce gain peaking to create a modified signal. A distributed amplifier receives and amplifies the modified signal from the emitter follower circuit, to create an amplified signal. The distributed amplifier includes a termination network and one or more impedance matching elements configured for gain shaping the amplified signal. The gain peaking introduced by the emitter follower circuit is controlled by a variable current source. The distributed amplifier may be an open collector distributed amplifier.

The present invention proposes a dual-power mode transceiver component that can be used under extremely narrow pulse width, including a transmitting channel circuit, a receiving channel circuit and a power management circuit. The transmitting channel is mainly composed of an attenuator, a single-pole single-throw switch, a gain amplifier, a driver amplifier, a final amplifier, a 3dB bridge, a coupler, a detector, and a power management circuit to complete the power amplification of the transmitted radio frequency signal. The receiving path is mainly composed of a limiter, a low-noise amplifier, a 3dB bridge, a digitally controlled attenuator, a temperature-compensated attenuator, a power supply and a control circuit to complete the low-noise amplification of the echo signal, and at the same time has a limiting protection function for high-power signals; the TR component provided by the present invention has two working modes, which can be used in large pulse width and high power mode, and can also be used in extremely narrow pulse width and low power mode, with good performance and high yield.

A high-frequency amplifier includes: an asymmetric Doherty amplifier that amplifies an input high-frequency signal of a wavelength λ, and includes a carrier amplifier and a peaking amplifier that starts an amplification operation when an output of the carrier amplifier reaches a saturation region and has a saturation output different from that of the carrier amplifier; a driver amplifier that drives the asymmetric Doherty amplifier; a branching circuit that branches the high-frequency signal amplified by the driver amplifier into an input path to the peaking amplifier side and an input path to the carrier amplifier side; a phase adjustment circuit that is provided on either of the path to the peaking amplifier side and the path to the carrier amplifier side and delays either of a phase of an input signal of the peaking amplifier and a phase of an input signal of the carrier amplifier; a first substrate on which the carrier amplifier and the peaking amplifier are mounted; and a second substrate on which the driver amplifier, the branching circuit, and the phase adjustment circuit are mounted, wherein, when the second substrate is stacked on the first substrate in an overlapping manner, an input terminal of the driver amplifier and an input terminal of the carrier amplifier are located at positions that project onto each other, and, when n is set to an integer of 0 or more, an electrical length from the input terminal of the driver amplifier to an output terminal of the carrier amplifier is set in such a manner that a phase becomes (2n+1)π.

The utility model discloses a logic circuit for increasing the common-mode transient immunity of an OOK modulation and demodulation digital isolator, the logic circuit comprises a transmitting terminal TX and a receiving terminal RX, the receiving terminal RX comprises a cross-coupled common-gate pre-drive amplifier composed of a plurality of transistors, the common-gate pre-drive amplifier amplifies signals sent by the transmitting terminal TX, and the common-gate pre-drive amplifier is used for amplifying the signals sent by the receiving terminal TX; the envelope comparator is used for comparing the output voltage of the common-gate pre-drive amplifier and outputting a corresponding high-level signal or a low-level signal; the forward common-mode voltage change rate detection circuit is a transistor MN5, the transistor MN5 is connected with the common-gate pre-drive amplifier, and the transistor MN5 is switched on or switched off by an output voltage signal of the transmitting end TX; the negative common-mode voltage change rate detection circuit is a transistor MP5, the transistor MP5 is connected with the common-gate pre-drive amplifier, and the transistor MP5 is switched on or switched off by an output voltage signal of the common-gate pre-drive amplifier; and the logic circuit is used for comparing an output signal of the output end of the envelope comparator, an output signal of the positive common-mode voltage change rate detection circuit and an output signal of the negative common-mode voltage change rate detection circuit, and outputting a logic processing result.

The present application provides a broadband on-chip driver amplifier. The driver amplifier includes: an input matching circuit for filtering the radio frequency signal; a driving stage circuit for performing initial amplification processing on the filtered radio frequency signal and sending it to a power divider; a power divider for dividing the radio frequency signal after the initial amplification into a first radio frequency signal and a second radio frequency signal according to a preset power distribution ratio, and sending it to an inter-stage matching circuit; an inter-stage matching circuit for sending the first radio frequency signal and the second radio frequency signal to a final stage circuit; a final stage circuit for re-amplifying the first radio frequency signal and the second radio frequency signal, and sending them to an output matching circuit; an output matching circuit for synthesizing the phases of the re-amplified first radio frequency signal and the second radio frequency signal, and outputting a synthesized signal. The present application can effectively improve the efficiency and operating bandwidth of the circuit at the back-off power point, and at the same time improve the gain flatness and circuit stability of the circuit.

An apparatus, comprising: a driver amplifier (DA) circuit, comprising: a driver amplifier (DA) including a differential output; a balun including a primary winding and a secondary winding, wherein the differential output of the DA is coupled to the primary winding of the balun, and wherein the secondary winding includes a first portion and a second portion, the second portion being coupled to ground; a first programmable resistor coupled between the first portion of the secondary winding and an output of the DA circuit; and a control circuit configured to adjust a resistance of the first programmable resistor to set a voltage standing wave ratio (VSWR) at a load coupled to the output of the DA circuit.

The application discloses a kind of ultra-wideband step frequency radio frequency front ends with high-order harmonic suppression, comprising: transmitter and receiver, high-frequency local oscillator passes through driver amplifier and band-pass filter, into power divider, one-way output signal as the intermediate frequency signal of down-conversion mixer, with step frequency signal is mixed, through low-pass filter to take lower sideband signal, then through power amplifier to transmitting antenna;In receiver, the signal of receiving antenna sequentially passes through low-noise amplifier and band-pass filter, into mixer, with coupled step frequency signal is mixed, take the upper sideband signal in output signal, after driver amplifier and band-pass filter, with the other way signal of power divider output IQ mixing is carried out, and AD sampling is carried out to I channel and Q channel respectively.According to the application, without switch filter group, the effective suppression of the high-order harmonic of transmitting signal can be realized, while reducing the complexity of system, the cost is effectively reduced.

An apparatus for implementing a Darlington circuit with a driver amplifier to provide power clamping is disclosed. In an example aspect, an apparatus includes an amplifier circuit having an input port and an output port. The amplifier circuit includes a driver amplifier, a power amplifier, and a Darlington circuit. The driver amplifier includes a driver amplifier output and a transistor, wherein the driver amplifier is coupled between the input port and the output port. The power amplifier includes a power amplifier input, and the power amplifier is coupled between the driver amplifier output and the output port. The Darlington circuit is coupled to the driver amplifier via a node coupled between the input port and the power amplifier input.

An optical transmitter includes a driver amplifier, a superimpose, an optical modulator, a detector and a controller. The driver amplifier amplifies a high-frequency signal. The addition processor adds a dither signal to the high-frequency signal amplified by the driver amplifier. The optical modulator modulates an optical signal according to the high-frequency signal to which the dither signal is added. The detector detects a fluctuation level of the dither signal from the modulated optical signal. The controller controls a gain of the driver amplifier that amplifies the high-frequency signal so that an output amplitude of the driver amplifier is constant based on the detected fluctuation level of the dither signal.

In some aspects, a buffer may interface an up-converter and a driver amplifier in a wireless transmitter. The buffer may comprise one or more branches that each include a first p-channel metal-oxide-semiconductor (PMOS) transistor having a source coupled to an output node, a gate coupled to an input voltage and to a first bias voltage, and a drain coupled to ground and a second PMOS transistor having a source coupled to a supply voltage, a gate coupled to an input voltage and to a second bias voltage, and a drain coupled to the output node. Accordingly, the buffer may include one or more PMOS transistor pairs in a common source and source follower configuration to provide low swing at an output from the up-converter, higher swing at an input to the driver amplifier, filter common mode noise and / or harmonics, and / or reduce undesired amplitude-to-phase modulation (AM / PM) effects.

The present invention discloses a Doherty-like power amplifier with improved back-off efficiency, which relates to an amplifier, including: an input power distribution network for isolating a driver amplifier unit (DR) stage and an adaptive bias circuit; a driver amplifier unit (DR) stage, whose output end is connected to the input end of a power output unit (PA) stage; an adaptive bias circuit for detecting changes in the envelope of the power amplifier input signal in real time based on the radio frequency signal transmitted by the input power distribution network, and outputting a voltage signal; a power output unit (PA) stage, which is provided with an input end for receiving a voltage signal, the voltage signal being used to control the bias tail pipe current of the power output unit (PA) stage; and an output matching balun network, whose input end is connected to the output end of the power output unit (PA) stage. The present invention achieves better back-off efficiency than a traditional Class AB power amplifier, and only requires one power output unit (PA) stage, without considering the load modulation effect, and can realize broadband applications.

A high-frequency amplifier includes a driver amplifier that amplifies a high-frequency signal inputted, and a Doherty amplifier including a carrier amplifier and a peak amplifier that further amplify a signal outputted from the driver amplifier, the high-frequency amplifier having a first multilayer substrate, a second multilayer substrate stacked in coincidence with the first multilayer substrate, and a base member that mounts the first multilayer substrate and the second multilayer substrate, the driver amplifier being mounted on the second multilayer substrate, the carrier amplifier and the peak amplifier being mounted on the first multilayer substrate, the driver amplifier, the carrier amplifier, and the peak amplifier each having a surface on which a prescribed circuit is formed and a back surface on an opposite side of the surface, the surface of the driver amplifier facing the first multilayer substrate, the back surface of the driver amplifier being configured to be separated from the first multilayer substrate, the back surfaces of the carrier amplifier and the peak amplifier each being in contact with the base member, the back surface of the driver amplifier being connected to a wiring layer configured on a surface of the second multilayer substrate, the wiring layer being connected to one end of a first via hole that penetrates the second multilayer substrate and the first multilayer substrate, the other end of the first via hole being connected to the base member.

Provided is a Doherty amplifier capable of generating, from the terminal voltage of one bias terminal, a control bias individually adjustable for a first stage amplifying element and a second stage amplifying element. The Doherty amplifier according to the present disclosure comprises a main amplifier and an auxiliary amplifier that are connected in parallel to an input terminal. The main amplifier and the auxiliary amplifier each include a driver amplifier and a final stage amplifier connected to the output of the driver amplifier. The driver amplifier of at least one among the main amplifier and the auxiliary amplifier includes: a first stage amplifier element; a second stage amplifier element; a bias terminal that receives a bias to be supplied to each of control electrode of the first stage amplifier element and a control electrode of the second stage amplifier element; a first resistor that has one end connected to the control electrode of the first stage amplifier element and the other end connected to the bias terminal; a second resistor that has one end connected to the control electrode of the second stage amplifier element and the other end connected to the bias terminal in parallel with the first resistor; and a constant current power supply that draws the current from the connection point between the second resistor and the control electrode of the second stage amplifier element.

The invention discloses an ultra-wideband millimeter wave amplifier circuit and a control method, and the circuit comprises a first-stage input matching circuit, a first-stage driving amplifier circuit, a first-stage inter-stage matching circuit, a second-stage power amplifier circuit and a second-stage output matching circuit which are connected in sequence, the filter also comprises a first-stage band-notch filtering structure and a second-stage band-notch filtering structure. The first-stage driving amplifier circuit is used for receiving the differential signal, amplifying the differential signal and transmitting the amplified differential signal to the first-stage inter-stage matching circuit; the second-stage power amplifier circuit is used for receiving the amplified differential signal, performing power matching on the amplified differential signal and then transmitting the amplified differential signal to the second-stage output matching circuit; and the first-stage band-notch filtering structure and the second-stage band-notch filtering structure are both used for introducing a transmission signal with a preset frequency in the amplifier circuit into an alternating current ground. According to the amplifier, the gain, the output power and the low-frequency stability can be improved.

To provide an optical transmitter capable of stabilizing optical output.SOLUTION: An optical transmitter includes a driver amplifier that amplifies a high-frequency signal, an adding unit that adds a dither signal to the high-frequency signal amplified by the driver amplifier, and an optical modulating unit that modulates an optical signal in accordance with the high-frequency signal to which the dither signal has been added. The optical transmitter also includes a detecting unit that detects a fluctuation level of the dither signal from the modulated optical signal, and a control unit that controls the gain of the driver amplifier that amplifies the high-frequency signal on the basis of the detected fluctuation level of the dither signal such that the output amplitude of the driver amplifier is constant.SELECTED DRAWING: Figure 2

Disclosed is a transmitter for transmitting radio frequency and millimeter wavelength signals. The transmitter comprises a first and a second transmission path, each transmission path having a signal with a different phase. The transmitter also comprises a first driver amplifier on the first transmission path and a second driver amplifier on the second transmission path, each of the first and second driver amplifiers receiving an input signal mixed with a carrier signal. The also transmitter comprises a first Doherty power amplifier on the first transmission path and a second Doherty power amplifier on the second transmission path, each of the first and the second Doherty power amplifiers having an input with a different phase and being configured to operate separately, wherein first driver amplifier is paired with the first Doherty power amplifier and the second driver amplifier is paired with the second Doherty power amplifier.

In some aspects, a buffer may interface an up-converter and a driver amplifier in a wireless transmitter. The buffer may comprise one or more branches that each include a first p-channel metal-oxide-semiconductor (PMOS) transistor having a source coupled to an output node, a gate coupled to an input voltage and to a first bias voltage, and a drain coupled to ground and a second PMOS transistor having a source coupled to a supply voltage, a gate coupled to an input voltage and to a second bias voltage, and a drain coupled to the output node. Accordingly, the buffer may include one or more PMOS transistor pairs in a common source and source follower configuration to provide low swing at an output from the up-converter, higher swing at an input to the driver amplifier, filter common mode noise and / or harmonics, and / or reduce undesired amplitude-to-phase modulation (AM / PM) effects.

This invention provides a high-frequency amplifier. The high-frequency amplifier includes: an asymmetric Doherty amplifier comprising a carrier amplifier and a peak amplifier, amplifying an input high-frequency signal; a driver amplifier driving the asymmetric Doherty amplifier; a branching circuit branching the high-frequency signal amplified by the driver amplifier to an input path on the peak amplifier side and an input path on the carrier amplifier side; a phase adjustment circuit delaying at least one of the phase of the input signal of the peak amplifier and the phase of the input signal of the carrier amplifier; a first substrate; a second substrate; and a substrate member mounting the first substrate and the second substrate. When n is set to an integer greater than or equal to 0, the electrical length from the output terminal of the driver amplifier to the input terminal of the peak amplifier is set such that, when converted to the phase of the input high-frequency signal, it falls within the range of (2n+1)×π-π / 4 to (2n+1)×π+π / 4.