92results about "Amplifier combinations" patented technology

Disclosed herein is reducing equivalent series resistance (ESR) of a power management circuit during a single transmission. The power management circuit includes a plurality of power amplifier circuits each configured to amplify a signal for transmission. The power management circuit includes a main multi-stage charge pump (MCP), a first voltage modulation circuit, a light-weight MCP, and a second voltage modulation circuit. When only one of the power amplifiers is active to amplify a signal for a single transmission, the power management circuit will opportunistically couple the main MCP, the first voltage modulation circuit, the light-weight MCP, and the second voltage modulation circuit to the active power amplifier. Thus, the active power amplifier will see a reduced ESR collectively presented by the main MCP, the first voltage modulation circuit, the light-weight MCP, and the second voltage modulation circuit, and can therefore operate with improved efficiency during the single transmission.

The embodiment of the present disclosure provides a variable gain amplifier with high temperature stability, which is applied to the technical field of electronic circuit. The amplifier comprises a constant transconductance bias circuit, a first variable gain amplifier and a second variable gain amplifier; wherein the output end of the constant transconductance bias circuit is connected with the input common source transistor of the first variable gain amplifier and the second variable gain amplifier, and is used for providing a constant transconductance bias signal which is compensated according to temperature change; the input end of the first variable gain amplifier is used for receiving an externally input differential signal, and the output end is connected with the input end of the second variable gain amplifier, and is used for transmitting the differential signal after coarse adjustment attenuation to the second variable gain amplifier; and the output end of the second variable gain amplifier is used for outputting an attenuation differential signal with temperature stability. In this way, by restraining the influence of temperature change on the transconductance characteristic of the input common source transistor of the variable gain amplifier, the stable attenuation characteristic of the variable gain amplifier in a wide temperature range is ensured.

An amplifying circuit (10) comprises: electric power amplifiers (11 and 12); a combining circuit (14) that is connected to an output end of the electric power amplifier (11) and an output end of the electric power amplifier (12); and a first series circuit that is composed of a first switch and a capacitor (171) that are connected in series to each other. The first series circuit is connected between the ground and a connection node (n1) on a path that connects the output end of the electric power amplifier (12) and the combining circuit (14).

The invention discloses a multi-loop control circuit and a control method thereof. The multi-loop control circuit comprises an amplification stage circuit and a current selection circuit. Wherein the amplification stage circuit is provided with a first transduction amplifier capable of outputting a first transduction amplification current and a second transduction amplifier capable of outputting a second transduction amplification current. The current selection circuit receives the first transduction amplification current and the second transduction amplification current and outputs an error output current. The current selection circuit selects the maximum one from the first transduction amplification current and the second transduction amplification current and outputs the maximum one as an error output current, and the error output current generates an error amplification signal.

This invention relates to a signal transmitter for a spatially distributed multi-parameter electrostatic sensor, comprising a first signal preprocessing circuit, a second signal preprocessing circuit, and a signal processing circuit. The first signal preprocessing circuit performs standard signal preprocessing and is used to multiplex signals from multiple sensors. The second signal preprocessing circuit includes N first signal amplification circuits, a signal superposition circuit, and a second signal amplification circuit. The first signal amplification circuits amplify the signals from each sensor, the signal superposition circuits superimpose the signals from multiple sensors, and the second signal amplification circuits amplify the superimposed signal. By using two different signal preprocessing processes, the appropriate preprocessing process can be selected according to different sensor signals, enabling reliable signal preprocessing.

The present disclosure provides a sequential power amplifier that achieves phase distortion compensation using sequential operation. [Solution] The sequential power amplifier according to this disclosure comprises a main amplifier that performs signal amplification at a constant load regardless of the input level, and an auxiliary amplifier that performs signal amplification at high power output when the input level is above a predetermined level, and whose phase distortion characteristics are different from those of the main amplifier. The phase distortion characteristics of the main amplifier are inverse to those of the auxiliary amplifier.

This application provides an operational amplifier, a chip, and an electronic device, and relates to the field of integrated circuit technologies. The operational amplifier includes a first power voltage end, a second power voltage end, a first-stage operational amplification circuit, and a second-stage operational amplification circuit. The first power voltage end is configured to receive a first power voltage signal, the second power voltage end is configured to receive a second power voltage signal, and a voltage value of the first power voltage signal is greater than a voltage value of the second power voltage signal. The first-stage operational amplification circuit is configured to: receive an input signal via a signal input end, and amplify the input signal under enabling control of the first power voltage signal, to generate a first drive signal. The second-stage operational amplification circuit is configured to: generate an output signal based on the first drive signal under enabling control of the second power voltage signal, and output the output signal via a signal output end. The operational amplifier has performance like low noise, low power consumption, high rate, and small area, and can be used in a chip.

This application relates to methods and apparatus for clipping prevention. A driver apparatus for driving a load with an output signal has a switching driver with a switch network and a modulator configured to control the switch network to switch output nodes between different switching voltages with a controlled duty-cycle. A quantizer controller receives a quantizer input signal based on an input signal and a feedback signal and controls the duty-cycle of the switch network. A clipping prevention controller is configured to control a gain applied to the input signal so as to provide limiting of the input signal to avoid clipping, wherein the clipping prevention controller is configured to dynamically control at least one limiting threshold used to determine when to apply limiting of the input signal based on an indication of said quantizer input signal.

The present application belongs to the technical field of signal test and measurement, and particularly relates to a high-sensitivity I-V conversion circuit and a design method thereof, which can improve the current measurement sensitivity by two orders of magnitude under the condition that the load voltage is the same. The present application realizes a high-sensitivity I-V conversion function through a two-stage active deep negative feedback circuit structure, and can increase the resistance value of a 100-fold current sampling resistor under the premise of keeping the load voltage unchanged, so as to greatly improve the voltage output by the I-V conversion circuit, and at the same time solve many problems caused by the great influence of the traditional I-V conversion circuit on the impedance of the current loop to be measured.

The present application relates to the technical field of electronic measurement, more particularly, it is especially related to a composite pressure expansion, flow expansion and frequency expansion circuit, which comprises an input signal source, a front-stage precision operational amplifier circuit, a rear-stage high-voltage and high-current operational amplifier circuit and a feedback loop, the input signal source is connected with the input end of the front-stage precision operational amplifier circuit, the output end of the front-stage precision operational amplifier circuit is connected with the input end of the rear-stage high-voltage and high-current operational amplifier circuit, and the feedback loop is connected between the output end of the rear-stage high-voltage and high-current operational amplifier circuit and the input end of the front-stage precision operational amplifier circuit.The present application uses cascaded operational amplifier circuits to realize a high-precision, high-voltage, high-current and wide-frequency output circuit.Through multi-stage operational amplifier cascading and feedback configuration, higher closed-loop gain is obtained under the premise of ensuring stability, and the effective bandwidth is expanded to meet the high-frequency or high-gain signal processing requirements.

A voltage-mode amplifier, comprising a first filter stage, comprising: a first voltage amplifier, connected to an input trace, and configured to amplify a signal conducted along the input trace; and a first N-path filter, connected to the input trace; wherein the first N-path filter is configured to shunt to a first reference voltage frequency from the signal; and a second filter stage, connected to the input trace in parallel to the first filter stage, comprising: a second voltage amplifier, connected to the input trace, and configured to amplify the signal conducted along the input trace; and a second N-path filter, connected to the input trace; and wherein the second N-path filter is configured to shunt to a second reference voltage frequency from the signal.

To provide a transimpedance amplifier circuit capable of amplifying current with low noise and high magnification, and a measuring instrument equipped therewith. [Solution] A transimpedance amplification circuit comprising: a first transimpedance amplifier that converts current to voltage; and at least one circuit block connected downstream of the first transimpedance amplifier, wherein each circuit block includes a conversion circuit that converts voltage to current, and a second transimpedance amplifier connected downstream of the conversion circuit that converts current to voltage. A measuring instrument comprising the transimpedance amplification circuit.

This application provides an analog front-end chip, an analog front-end circuit, and a signal processing device, including: a first operational amplifier module for amplitude adjustment of an electrical signal connected to a first input impedance network; and a second operational amplifier module for amplitude adjustment of an electrical signal connected to a second input impedance network. The second input impedance network has a different impedance than the first input impedance network. The first and second operational amplifier modules are integrated within the same chip. This solves the problem of parasitic capacitance and resistance sensitivity caused by external chip interconnections; avoids the influence of process deviations on the bandwidth of the signal transmission path; and easily achieves high bandwidth performance for the analog front-end circuit. Simultaneously, since all critical signal paths are within a single chip, the temperature characteristics are consistent, resulting in minimal system temperature drift.

This invention provides a drive circuit that can calculate the optimal phase adjustment amount by applying current to an external load. [Solution] The drive circuit (600, 700) according to this disclosure includes a control circuit (11, 9) that outputs a first AC signal (V11) and a second AC signal (V12, V2) from an AC signal source (1, 10), a reference voltage generation circuit (3) that has a differential amplifier that generates a first AC voltage (V21) from the first AC signals (V11, V1) and outputs the first AC voltage (V21) to one end of an external load (4), and a second AC The system includes a voltage-to-current conversion circuit (2) that supplies alternating current (I) to an external load from current signals (V12, V2), and a comparator (7) connected to both ends of the external load (4) that compares a first alternating voltage (V21) at one end of the external load with a second alternating voltage (V22) at the other end of the external load, and changes the output voltage (V23) when the first alternating voltage (V21) and the second alternating voltage (V22) are reversed.

The application discloses a programmable gain amplifier and a control method thereof. The programmable gain amplifier comprises a first differential amplifier circuit, a first set of gain resistors, a second set of gain resistors, a set of sampling capacitors, a first set of switches and a second differential amplifier circuit. The first set of switches is used for selectively coupling the first set of gain resistors between an inverting input voltage and an input of the first differential amplifier circuit, coupling the second set of gain resistors between a common-mode voltage source and the input of the first differential amplifier circuit, and coupling the set of sampling capacitors with respective outputs of the first differential amplifier circuit during a first stage of an offset calibration of the first differential amplifier circuit. Through storage of the sampling capacitors and negative feedback of the second differential amplifier circuit, an offset voltage on the first differential amplifier circuit is offset, so that the influence of the offset voltage on a front-stage amplifier circuit on detection accuracy can be effectively reduced.

An amplifier having one or more channels where each channel includes a two half bridges (a master and slave sub-channel). The sub-channels can be connected either in parallel or in a full-bridge configuration via internal switches that route signals to a pair of speaker jacks. One switch in the amplifier has a first position that selectively connects the outputs of the master and slave sub-channel to the same input of the speaker load so that the two sub-channels will drive the speaker load in parallel and a second position where the output of the slave sub-channel is connected to another input of the speaker load so that the master sub-channel and the slave sub-channel will drive the speaker load in a Full-bridge configuration. A second switch has a first position that connects a second input of the speaker load to ground or reference potential of the sub-channels when the speaker load is to be driven in parallel and a second position that is a No-connect position that is used when the speaker load is driven in the Full-bridge configuration and a ground potential is not to be connected to the speaker.

The application provides a pulse radiator, relates to the field of microwave radio frequency technology, and comprises a radio frequency multistage amplification link and a measurement and control communication component; the radio frequency multistage amplification link generates an output pulse signal; the measurement and control communication component performs real-time monitoring and regulation on the output pulse signal, and is configured with a self-adaptive degradation fault prevention shutdown control strategy. In a continuous radiation working mode, operating state parameters are continuously acquired; when the operating state parameters reach a preset warning limit, the self-adaptive degradation control is triggered, a dynamic attenuation control code is issued to reduce the output gain to enter a degradation working mode; during the degradation working mode, the parameter development trend is continuously monitored; when the parameters recover to a safe interval, the dynamic attenuation control code is reversely adjusted to smoothly recover the output gain to the initial setting state. The application prevents hard power-off shutdown of the equipment caused by abnormal working conditions, and maintains continuous radiation of the signal.

This invention discloses an excitation circuit and method for a fluxgate magnetic probe. The excitation circuit includes a crystal oscillator, a frequency divider, a D flip-flop, a first current amplifier, a second current amplifier, a first resistor, a second resistor, a first capacitor, a second capacitor, a transistor, and an excitation coil. The crystal oscillator generates a high-frequency periodic signal, which is input to the input terminal of the frequency divider. The frequency divider divides the signal to obtain a square wave signal of the desired frequency. The square wave signal is input to the input terminal of the first current amplifier and the data input terminal of the D flip-flop. The data output terminal of the D flip-flop is connected to the input terminal of the second current amplifier. The first current amplifier is sequentially connected to the first resistor, the first capacitor, the excitation coil, the second capacitor, and the second resistor. The other end of the second resistor is connected to the output terminal of the second current amplifier. The base of the transistor is connected to the output terminal of the first current amplifier, and the collector of the transistor is connected to the clock control terminal of the D flip-flop.

To provide bidirectional variable gain amplifiers (VGAs) for radio frequency (RF) communication systems.SOLUTION: A bidirectional VGA 120 includes a first amplifier A1 having an input coupled to a transmit / receive port TR, a second amplifier A2 having an output coupled to a transmit port TX, a third amplifier A3 having an input coupled to a receive port RX, a fourth amplifier A4 having an output coupled to the transmit / receive port TR and to the input of the first amplifier A1, and a switch circuit S1, S2 that connects an output of the first amplifier A1 to an input of the second amplifier A2 in a transmit mode, and that connects an output of the third amplifier A3 to an input of the fourth amplifier A4 in a receive mode.SELECTED DRAWING: Figure 4

A tracker module, a power amplifier module, a high frequency module, and a communication device are provided. Power consumption is reduced. A tracker module (1) of the present invention includes a second substrate separate from a first substrate, a tracker component (3), and a low pass filter (4). A power amplifier is disposed on the first substrate. The tracker component (3) supplies a power supply voltage to the power amplifier. The low pass filter (4) is connected to a path between an output of the tracker component (3) and the power amplifier. The tracker component (3) and the low pass filter (4) are disposed on the second substrate.

Provided is a management device that manages a wireless base station equipped with a plurality of antennas, the wireless base station being a control target of a Radio Access Network (RAN) control function that controls a RAN function by executing an AI process (RAN Intelligent Controller (RIC)) or the like. The management device comprises: an acquisition unit that acquires a signal to be transmitted to the outside; a determination unit that, on the basis of the signal, determines a route through which the signal is transmitted to one antenna from among the plurality of antennas; and an amplification unit that has a plurality of amplifier groups arranged in parallel. The route is constituted of, from among the plurality of amplifier groups, one or more amplifier groups for amplifying the signal, and one switch from among a plurality of switches positioned between the plurality of amplifier groups and the plurality of antennas.

Provided in the present application are a touch-control detection circuit and a display apparatus. The touch-control detection circuit comprises a piezoelectric ceramic sensor, an electrically conductive member, a detection circuit, a compensation circuit and a controller, wherein the detection circuit is electrically connected to both the electrically conductive member and the piezoelectric ceramic sensor; the compensation circuit is connected to the piezoelectric ceramic sensor; an input terminal of the controller is connected to the detection circuit, and an output terminal of the controller is connected to the compensation circuit; and the controller is configured to receive a detection signal in digital form, acquire a vibration signal and / or a pressure signal of a touch-control cover plate on the basis of the detection signal, and control the compensation circuit to output a compensation charge amount to the piezoelectric ceramic sensor.

This application relates to a vibration signal acquisition system. The system includes: a vibration sensor; two filtering circuits, the input terminals of which are both connected to the output terminal of the vibration sensor; an ADC module, comprising: a first ADC unit and a second ADC unit, the input terminal of the first ADC unit being connected to the output terminal of one filtering circuit, and the input terminal of the second ADC unit being connected to the output terminal of the other filtering circuit. When the vibration sensor is in operation, the output terminal of the first ADC unit outputs a first digital signal, and the output terminal of the second ADC unit outputs a second digital signal; and an MCU module, which calculates the average value of the first and second digital signals to obtain a vibration digital signal. This system solves the problem of low accuracy and reliability of vibration signals acquired by existing vibration signal acquisition systems.

An amplifier circuit 101 includes: a first current source circuit 113 configured to output a predetermined current amount to a first interconnect L1; a voltage amplifier circuit 110 configured to amplify a voltage of an input signal; a first level shift circuit 111 connected between the first interconnect L1 and an output of the voltage amplifier circuit 110 and configured to shift a voltage of a signal output from the voltage amplifier circuit 110; a first voltage follower 117 connected to the first interconnect L1 and configured to amplify a signal in the first interconnect L1; and a first capacitor 210 connected between the first interconnect L1 and the output of the voltage amplifier circuit 110.

The application provides a radio frequency power amplifier, which comprises a signal input end, a driving amplifier realized by a CMOS process, a power amplifier realized by a GaAs HBT process, a power combining network and a signal output end which are electrically connected in sequence and integrated on the same substrate; the driving amplifier is electrically connected in sequence by a first-stage amplifier, an inter-stage balun network, a second-stage amplifier and a second-stage output transformer network; the input end of the first-stage amplifier is connected to the signal input end, and the output end of the inter-stage balun network is connected to the input end of the second-stage amplifier; the radio frequency power amplifier is used for converting a single-ended signal amplified by the first-stage amplifier into a differential signal and outputting a first differential signal and a second differential signal. The radio frequency power amplifier has small insertion loss, high output power, improved efficiency and linearity.

This application discloses a radio frequency power amplifier, a remote radio unit, and a base station. The radio frequency power amplifier includes three amplifier branches. In this specification, two amplifier branches have narrow operating frequency bands and operate on frequency band A and frequency band B, respectively, and the other amplifier branch is designed to have a wide frequency band and operates on frequency band A+B. The radio frequency power amplifier further includes an inter-frequency power divider circuit and two circulators. The inter-frequency power divider circuit performs inter-frequency power division on the output signal of the wideband amplifier branch to output two narrowband signals, which are output after being power-combined by the circulator. Based on the technical solution of this application, a wideband problem is converted into a narrowband problem, thereby improving power amplification efficiency. In addition, the wideband amplifier branch provides a power distribution function, thereby processing high-power wideband signals. A narrowband isolator is used at a lower level of the circulator, thereby reducing the difficulty of designing the isolator.

The application discloses a radio frequency power supply power control system and method for semiconductor processes, and belongs to the technical field of radio frequency power supplies; the system comprises a frequency source, a first power amplification link, a second power amplification link, a quadrature power combiner, a sampling unit, a sampling and feedback unit and a controller; the frequency source generates two radio frequency excitation signals which are respectively input into the first power amplification link and the second power amplification link; the controller adjusts the phase of the radio frequency signals input into the first power amplification link and / or the second power amplification link, so as to change the phase difference of the two signals at the input end of the quadrature power combiner, thereby adjusting the radio frequency power output to the semiconductor process chamber. The application combines high-efficiency power amplifiers, quadrature synthesis and fast phase control, and provides an advanced radio frequency power solution with high efficiency, high precision and high dynamic performance for semiconductor manufacturing equipment.

An integrated circuit (IC) 100 includes a first transducer driver 102 and a second transducer driver 104, for respectively driving first and second transducers 114, 116, and boost converter circuitry