1243results about "Amplifier combinations" patented technology

The invention relates to a mass spectrometer ion detector micro-current multistage amplification circuit, which comprises a primary amplification circuit, a voltage following circuit, a secondary amplification circuit, a gain adjustment control circuit and an analog-to-digital conversion circuit, the gain adjustment control circuit can dynamically adjust the gain gears of the first-stage amplification circuit and the second-stage amplification circuit, 16 groups of different amplification gains can be achieved in total, and the application requirement for simultaneous detection of nine orders of magnitude of substances with different concentrations is met. The circuit is simple and reliable, is flexible and convenient to use, greatly widens the detection range of the mass spectrometer, and improves the automatic control level and detection efficiency of the mass spectrometer.

A logarithmic amplifier system is disclosed. The system includes first and second amplifiers respectively having first and second gains; a first multiplier having an input connected to an output of the first amplifier, and being configured to output a first multiplied signal based on an output signal of the first amplifier and based on a received first multiplication factor equal to a value K; a second multiplier having an input connected to an output of the second amplifier, and being configured to output a second multiplied signal based on an output signal of the second amplifier and based on a received second multiplication factor equal to 1 minus the value K; a transition shaping circuit configured to change the value K from 0 to 1 with a filtered transfer function; and a summing circuit having inputs coupled to outputs of the first multiplier and the second multiplier.

A class D amplifier circuit receives an analog audio signal with a first reference voltage as its center level, and outputs an output pulse signal having a duty cycle that corresponds to the analog audio signal. A bias circuit generates a second reference voltage having a voltage level obtained as a division of the first reference voltage and the power supply voltage. A periodic voltage generating circuit of the class D amplifier circuit generates a periodic voltage having a triangle waveform or otherwise a sawtooth waveform having an amplitude that corresponds to the second reference voltage.

An amplifier includes a first amplifier circuit, and a second amplifier circuit that amplifies an output signal of the first amplifier circuit. The first amplifier circuit includes a first divider that divides an input signal into a first signal and a second signal, a control amplifier that amplifies the first signal and output an amplified signal as a third signal, a second divider that divide the second signal into a fourth signal and a fifth signal having different phases at a center frequency of an operation band, a first auxiliary amplifier that amplifies the fourth signal and outputs an amplified signal as a sixth signal, a second auxiliary amplifier that amplifies the fifth signal and outputs an amplified signal as a seventh signal, and a hybrid coupler including a first end, a second end, a third end, and a fourth end.

The invention discloses a parallel constant-voltage digital audio power amplifier and a broadcasting system. Comprising a line input module, a line output module, a first analog-to-digital conversion circuit, a second analog-to-digital conversion circuit, a third analog-to-digital conversion circuit, a digital signal processor, a single-chip microcomputer, a digital-to-analog conversion circuit, an error comparator, a modulator, an integrating circuit, a pulse width modulation input half-bridge output stage, and a first carrier frequency selection and gain adjustment module. A second carrier frequency selection and gain adjustment module, a first LC filter, a high-frequency compensation network, a communication bus and a power switch. The technical problems that an existing multi-channel parallel digital constant-voltage power amplifier is only limited to power amplifier channels in the same power amplifier, the parallel connection mode only uses the first channel as a main power amplifier and only uses the other channels as slave power amplifiers, and certain limitation exists are solved.

The embodiment of the invention discloses a temperature compensation circuit of an eddy current sensor. The temperature compensation circuit comprises an excitation source, an LC resonance unit, a detection unit, a filtering unit, an amplification unit and a temperature compensation unit, the excitation source is used for inputting an alternating current signal; the LC resonance unit is used for forming resonance according to the alternating current signal; the detection unit is used for modulating the alternating current signal after resonance into a direct current signal; the filtering unit is used for filtering the direct current signal; the amplification unit is used for amplifying the filtered direct current signal and then outputting the amplified direct current signal; and the temperature compensation unit is used for compensating the drift distance of the sensitivity of the signal output by the amplification unit under the temperature change and compensating the drift distance of the bias of the input signal of the amplification unit under the temperature change. By implementing the circuit provided by the embodiment of the invention, the sensitivity temperature drift and the bias temperature drift output by the eddy current sensor can be compensated, and the stability and the accuracy of the output of the eddy current sensor are ensured.

Aspects of this disclosure relate to a power amplifier system with symbol-based envelope tracking and fault protection. The system can include a power amplifier and a voltage modulator. The voltage modulator can include switches configured to provide the bias voltage and to provide electric circuit breaker protection. The voltage modulator can include a fault detection circuit that can cause a switch of the switches to provide electric circuit breaker protection in response to detecting a circuit fault. Related methods and voltage modulators are disclosed.

According to the operational amplifier with the low offset voltage and the electronic equipment, on one hand, the offset voltage existing in the first operational amplifier unit and the offset voltage existing in the second operational amplifier unit are stored and accurately offset through the first offset voltage elimination unit and the second offset voltage elimination unit respectively; the first output current unit and the second output current unit generate first output current and second output current errors respectively due to the offset voltage. And on the other hand, the first operational amplifier module and the second operational amplifier module are controlled to be alternately in different working stages by controlling the on-off of the switch, so that the input end of the operational amplifier module in a normal working state in each clock period is ensured to have extremely low offset voltage, and the offset voltage elimination continuity is ensured.

Implementations of disclosed systems and methods are capable of changing the frequency or other waveform characteristics dynamically based on receiving feedback about the effect of an electromagnetic pulse radiation on a target electronic device. Various implementations can be configured to emit electromagnetic pulses at a single radio frequency or a plurality of radio frequencies. For example, the frequency of the carrier electromagnetic radiation in a single pulse can change during the pulse interval. As another example, a single electromagnetic pulse can comprise a frequency comb with two or more frequencies.

An SIP module integrated direct wave amplifier comprises a power supply control module, an X-band down-conversion module and an L-band down-conversion module, the power supply control module provides attenuation control signals and a low-ripple power supply for the X-band down-conversion module and the L-band down-conversion module, the X-band down-conversion module performs primary frequency conversion on externally received radio frequency signals, and the L-band down-conversion module performs secondary frequency conversion on the externally received radio frequency signals. The L-band down-conversion module performs secondary frequency conversion on the radio frequency signal subjected to primary frequency conversion by the X-band down-conversion module, the two down-conversion modules are arranged to realize structure modularization and standardization by adopting a SiP modularization mode, and each module is independent in function, so that the structure is simple, the cost is low, and the cost is low. Meanwhile, the serial-parallel conversion chip control circuit is adopted to control the numerical control attenuator to meet the requirements for high gain and large dynamic range of the direct wave amplifier, the architecture and the number of control circuits are simplified, and the circuit is easy to build, easy to use, convenient to integrate and high in selection flexibility.

The invention relates to the technical field of weak signal conditioning circuits, and discloses a multi-light-source spurious noise suppression circuit based on a laser sensor and a signal conditioning method, and the circuit comprises a photoelectric conversion module which is used for converting a received optical signal into a current signal; the transimpedance conversion module is connected with the photoelectric conversion module, converts the current signal into a first voltage signal and suppresses common-mode noise; the first-stage amplification module is used for carrying out linear amplification on the first voltage signal and outputting a second voltage signal; the programmable filtering module is used for carrying out high-frequency noise suppression on the second voltage signal; the reverse phase adjusting module is used for adjusting the phase and the amplitude of the filtered signal so as to adapt to a post-stage load; and the feedback control module analyzes the frequency spectrum of the output signal in real time and dynamically adjusts the cut-off frequency of the programmable filtering module. The invention aims to solve the problems that in the prior art, a laser sensor circuit is poor in anti-interference performance in a multi-light-source environment, and measurement is inaccurate due to spurious noise.

The embodiment of the invention provides a multi-channel power amplification architecture, radio frequency generation equipment and a communication system, and is applied to the technical field of wireless communication. The multi-channel power amplification architecture comprises a multi-channel amplification circuit and a first pilot frequency power division circuit. The multi-path amplification circuit is used for outputting a first radio frequency signal and / or a second radio frequency signal. The first pilot frequency power dividing circuit comprises at least one microstrip line. The first pilot frequency power division circuit performs power synthesis on the multiple paths of first radio frequency signals and / or second radio frequency signals based on impedance characteristics of the microstrip line, and outputs power synthesis signals of the first radio frequency signals and power synthesis signals of the second radio frequency signals through a pilot frequency power division function. According to the embodiment of the invention, power synthesis and pilot frequency power division are realized based on the pilot frequency power division structure comprising the microstrip line, and design limitation, insertion loss and the like caused by a bridge structure are avoided. According to the embodiment of the invention, large-bandwidth, large-backoff-amount, high-efficiency and multi-band power amplifier design can be carried out more easily.

The invention discloses a novel chopping correlation double-sampling stable multi-path amplifying circuit and method, and relates to integrated circuit design. A Miller compensation capacitor in a chopping stable multi-path CSMP amplification circuit architecture is utilized to design a chopping correlation double-sampling circuit, and compared with a traditional correlation double-sampling circuit, a group of sampling capacitors and sampling switches are reduced. Large capacitance and large resistance required by a traditional high-pass filter circuit are eliminated, and the layout area and the current required for driving a high-pass filter capacitor are reduced; and thermal noise caused by large resistance in the passive high-pass filter is reduced, and the input equivalent noise density is improved. Through an offset calibration technology, the stability of the CSMP architecture is ensured, and the offset voltage is reduced at the same time; output ripples are suppressed by using the high-pass performance of the novel chopping correlation double-sampling circuit, 1 / f noise is reduced, and input equivalent noise density is reduced. The advantages of the chopping correlation double sampling technology and the stable multi-path amplification circuit are combined, and the advantages of low offset, low output ripple and low input equivalent noise density are achieved.

A method of supplying power to a processing plasma or a laser in a discharge chamber (30), comprising: a. supplying power from an output port (24) of a balanced amplifier (12) to the discharge chamber (30), wherein the balanced amplifier (12) includes at least two amplifier path portions (14, 16) each supplying a signal to a coupler (22), the coupler (22) having an output port (24) and an isolation port (26), configured to combine signals depending on the phase relationship of the signals and supply power to the output port (24) and / or the isolation port (26) depending on the phase relationship of the signals; b. setting a first phase relationship of the signals for a predetermined time to initiate the plasma or the laser; and c. setting a second phase relationship different from the first phase relationship to operate the laser or maintain the plasma in the discharge chamber (30).

Circuits and methods for providing ESD protection, particularly for LNAs lacking a DC blocking input capacitor (“capless LNAs”). Novel circuitry provides both improved ESD protection and an improved Noise Figure compared to conventional designs. One embodiment includes an integrated circuit including a voltage source pin and a plurality of low-noise amplifiers lacking a respective DC blocking input capacitor, each of the plurality of low-noise amplifiers including: a voltage source terminal coupled to the voltage source pin, an input terminal configured to receive a signal to be amplified, an output terminal configured to output an amplified version of the received signal to be amplified, an ESD protection circuit coupled to the input terminal and to both the voltage source terminal and a reference potential, and a distributed ESD clamp coupled between the reference potential and a node located between the ESD protection circuit and the voltage source terminal.

A cascade amplification circuit module based on complementary parameter amplifiers belongs to the technical field of integrated circuit amplifiers and comprises a first-stage complementary parameter amplifier (CPA) and a second-stage amplifier (floating inverting type or transconductance resistance type). The first-stage CPA adopts an NMOS and PMOS complementary structure, passive amplification is achieved through grid multiplexing, a grid capacitor is used for storing signals in the sampling stage, a depletion layer capacitor is switched to improve gain in the amplification stage, common-mode voltage is stabilized through complementary design, and an extra feedback circuit is not needed. And the second-stage amplifier provides driving capability and is combined with passive gain to suppress noise. The cascade structure does not need frequency compensation, the design is simplified, the problem of balancing gain, noise and power consumption of a traditional amplifier is solved, and the cascade amplifier has the advantages of being high in energy efficiency and low in complexity.

The invention relates to the technical field of amplifiers, and discloses an analog-to-digital converter combination instrument amplifier which comprises a first-stage amplifier, the first-stage amplifier is in signal connection with a second-stage amplifier, the second-stage amplifier is in signal connection with a front-end low-pass filter (LPF), the front-end low-pass filter (LPF) is in signal connection with an analog-to-digital converter (ADC), and the analog-to-digital converter (ADC) is in signal connection with the analog-to-digital converter. And an unbalanced input-to-balanced differential circuit output module is arranged between the second-stage amplifier signal and a front-end low-pass filter (LPF). From the perspective of signal processing and conversion, a precise signal transition bridge is constructed by adding an unbalanced input-to-balanced differential circuit output module, unbalanced signals output by a second-stage amplifier are converted into double-end balanced differential signals, common-mode noise interference is effectively resisted through a differential transmission mode, the signal purity is guaranteed, and the signal quality is improved. The front-end low-pass filter and the analog-to-digital converter are adaptive to differential signals, so that the signal transmission is stable and anti-interference, and the analog-to-digital conversion is more accurate.

The present application belongs to the technical field of wireless communications. Provided in the embodiments of the present application are a multi-channel power amplification architecture, a radio frequency generation device and a communication system. The multi-channel power amplification architecture comprises a plurality of amplification circuits and a first multi-frequency power divider circuit; the plurality of amplification circuits are used for separately outputting first radio frequency signals and / or second radio frequency signals; the first multi-frequency power divider circuit comprises at least one microstrip line; the first multi-frequency power divider circuit performs power combining on multiple first radio frequency signals and / or second radio frequency signals on the basis of the impedance characteristic of the microstrip lines, and separately outputs power-combined signals of the first radio frequency signals and power-combined signals of the second radio frequency signals by means of a multi-frequency power dividing function. The embodiments of the present application implement power combining and multi-frequency power dividing on the basis of the multi-frequency power divider structure comprising the microstrip lines, so as to avoid design limitation, insertion loss and the like caused by bridge structures. The present embodiments facilitate design of large-bandwidth, large-backoff, high-efficiency and multi-frequency-band power amplifiers.

A current sense amplifier measures a voltage drop in a drive transistor LS to measure the current flowing through the drive transistor LS. The current sense amplifier includes a preamplifier pre-amp, to which a voltage across the drive transistor LS is inputted, and which obtains a positive output and a negative output corresponding to a voltage difference of the inputted voltage across the drive transistor; and a switch sw, which connects the input end of a common mode voltage vcm and the negative output, the common mode voltage vcm serving as the operation reference of the preamplifier pre-amp. A change of the positive output caused by turning on / off the switch sw can be detected.

The embodiment of the invention provides a signal processing circuit and an integrated circuit. The signal processing circuit includes: a first amplification branch including a first operational amplifier and a first resistance network connected to the first operational amplifier; a detection branch coupled to an input of the first amplification branch, the detection branch comprising a variable resistor and configured to detect a common mode component input to the first amplification branch and generate a compensation signal based on the common mode component and a resistance value of the variable resistor; and an adjustment branch coupled between the detection branch and the first amplification branch and configured to adjust the compensation signal and apply the adjusted signal to the first amplification branch to reduce an input deviation of the first operational amplifier, the input deviation being associated with a resistance mismatch and a common mode component of the first resistance network.

The invention provides a high-integration-level signal reading module for a neutron proportional counter tube, and belongs to the technical field of neutron detection, the high-integration-level signal reading module comprises stacked double-layer circuit boards, and the upper circuit board and the lower circuit board are connected through pin interfaces; the upper circuit board is provided with a signal processing circuit which is used for reading, amplifying, discriminating and shaping signals of the neutron proportional counter tube. The lower-layer circuit board is provided with a positive and negative dual-power-supply support circuit which provides + / -3.3 V power supply support for the signal processing circuit of the upper-layer circuit board. The module supplies power through the lower-layer power panel, and the lower-layer circuit board supplies positive and negative power to the upper-layer circuit board after completing power conversion. Signals are input through the IPX interface of the upper-layer circuit board and are output through the other IPX interface after being processed. The charge sensitive pre-amplifier, the broadband voltage amplifier, the pulse discriminator circuit, the pulse shaping circuit and the power management module are integrated in the same module, so that the real integrated design is realized.

The utility model belongs to the technical field of human body pulse detection, and discloses a pulse amplifying circuit based on a pressure sensor and a pulse signal acquisition system, and the circuit comprises the pressure sensor, a first-stage amplifying circuit, a second-stage amplifying circuit, a third-stage amplifying circuit, a fourth-stage amplifying circuit and a reference circuit, the signal input end of the first-stage amplification circuit receives an original pulse signal output by a pressure sensor and then outputs a differential amplification signal, the signal input end of the second-stage amplification circuit receives the differential amplification signal and then suppresses a common-mode signal and outputs a second amplification signal, and the signal input end of the third-stage amplification circuit receives the second amplification signal and then outputs the third amplification signal. The isolated direct current passes through a signal and outputs an alternating current signal in a following mode, a fourth-stage amplifying circuit receives the alternating current signal and then amplifies and filters the alternating current signal, and an amplified pulse signal is obtained and output. According to the utility model, the cost of the product is reduced, the circuit is simplified, the practicability is enhanced, and the pulse signal can be accurately measured.

According to some exemplary aspects, a tracker circuit includes at least a terminal configured to receive a first regulating voltage from a first converter circuit that is configured to convert an input voltage to the first regulating voltage. The tracker circuit also includes a second converter circuit configured to generate a plurality of discrete voltages based on the first regulating voltage and a first supply modulator configured to selectively output at least one of the plurality of discrete voltages to a first power amplifier. The first regulating voltage is provided to a second power amplifier without passing through the second converter circuit.

Aspects of this disclosure relate to voltage modulators with staged activation of switches. A voltage modulator can receive supply voltages and provide a selected one of the supply voltages as an output voltage. The voltage modulator can include switches in parallel where one of the switches in parallel activates before another switch in parallel in association by transitioning the output voltage between different supply voltages. Embodiments of this disclosure relate to symbol-based envelope tracking. Related systems and methods are disclosed.

The invention discloses a high-precision analog signal processing circuit based on multi-stage operational amplification, which comprises a signal input conditioning module, a main amplification channel and a feedback regulation channel, and the core is to realize signal amplification, filtering and closed-loop control by using an operational amplifier. Precise processing and stable output of complex signals are achieved through differential input, multi-stage amplification, filtering shaping and closed-loop feedback. Signal precision, anti-interference performance and adaptability are effectively improved, and the method is suitable for constant current source feedback, precise instrument and industrial sensing signal processing and power equipment performance upgrading.

The array core block for the AESA includes a stack of 2×M alternating N-channel RFIC and MMIC power amplifier wafers bonded together by a wafer-scale direct-bonded hybrid (DBH) interconnect process that forms both metal-to-metal bonds and dielectric hydrogen bonds between the bonding surfaces to seal the wafer stack. Each array core block includes an array of through-substrate metal vias for distributing DC bias, LO signals, and information signals. Each array core block also includes a microchannel formed on the backside of at least one of the chips of each bonded pair and through-substrate via holes formed through the stack operatively coupling the microchannels to all of the bonded pairs, and includes a cooling system that receives and circulates fluid through the microchannels and through-substrate via holes to cool the RFIC and MMIC power amplifier chips and extract heated fluid.

According to embodiments, a method performed by an electronic device includes: identifying a channel bandwidth; identifying one or more active DPD units among a plurality of DPD units of a digital pre-distortion (DPD) circuit based on the channel bandwidth and amount of resource allocated within the channel bandwidth; generating a DPD output signal of the DPD circuit based on the one or more active DPD units; generating an amplifier output signal based on the DPD output signal of the DPD circuit, a digital-to-analog converter (DAC), and a power amplifier (PA). While the DPD output signal is generated, at least one DPD unit different from the one or more active DPD units among the plurality of DPD units of the DPD circuit is deactivated.

The invention provides a radio frequency front-end circuit, a radio frequency transceiving device and electronic equipment. The radio frequency front-end circuit comprises a first power amplifier and a power amplification module; the first power amplifier is provided with a first port, and the first port is used for outputting a transmitting signal of a target frequency band; the power amplification module is provided with an input port and an output port, the input port is electrically connected to the first port, the output port is used for being electrically connected to the first radiator, the power amplification module comprises a second power amplifier, and the second power amplifier is used for carrying out power amplification on the transmitted signal; the maximum input power capable of being borne by the second power amplifier is greater than the maximum output power capable of being borne by the first power amplifier; the radio frequency front-end circuit has a first state in which the input port is electrically connected to the output port via the second power amplifier; and a second state in which the input port is electrically connected to the output port while avoiding the second power amplifier. The radio frequency front-end circuit provided by the invention has relatively high TRP.

The invention provides an ion detection amplifier and an ion detection method, and belongs to the field of mass spectrometers. The ion detection amplifier provided by the invention comprises a primary amplification circuit used for receiving a current signal output by an ion detector; the load module is connected with the primary amplification circuit in parallel, and the load module comprises a plurality of feedback branches; the secondary amplification circuit is connected with the output end of the primary amplification circuit, is used for amplifying an output signal of the primary amplification circuit, and is provided with a plurality of secondary gain gears; the gain switching control circuit is respectively connected with the load module and the secondary amplification circuit; and the signal processing circuit is used for receiving an output signal of the secondary amplification circuit. According to the ion detection amplifier and the ion detection method provided by the invention, collection, amplification, switching and digital output of ion signals can be accurately and efficiently completed in a complex scene.

An amplifier circuit is an amplifier circuit that receives a plurality of discrete power supply voltages and includes a carrier amplifier, a peak amplifier, a combiner circuit that combines a high frequency signal outputted from the carrier amplifier and a high frequency signal outputted from the peak amplifier together, a bias circuit that supplies a first bias current to the peak amplifier, a digital control terminal that receives a digital control signal based on an envelope signal, and a switch that is connected to the digital control terminal and switches between connection and disconnection between the bias circuit and the peak amplifier. Each of the carrier amplifier and the peak amplifier includes a plurality of amplifier elements that are cascode-connected.