1684results about "Amplifier combinations" patented technology

A quadrature coupler includes four ports, four inductors, and six capacitors. The first through third capacitors are coupled in series between the first and fourth ports. A first intermediate node is between the first and second capacitors. A second intermediate node is between the second and third capacitors. The fourth through sixth capacitors are coupled in series between the second and third ports. A third intermediate node is between the fourth and fifth capacitors, and a fourth intermediate node is between the fifth and sixth capacitors. The first inductor is coupled between the first and second ports. The second inductor is coupled between the first and third intermediate nodes. The third inductor is coupled between the second and fourth intermediate nodes. The fourth inductor is coupled between the fourth and third ports. Variable tuning networks may be coupled between the first and fourth ports and the second and third ports.

The invention relates to the technical field of integrated circuit design, and particularly discloses a low-noise programmable amplifier, which comprises a first fully-differential amplifier, a second fully-differential amplifier, a third fully-differential amplifier and a fourth fully-differential amplifier, the second fully differential amplifier comprises a pair of differential input ends and is electrically connected with the first fully differential amplifier through an interstage chopper switch; a pair of input chopping switches, wherein the input end of each input chopping switch is electrically connected with a differential input signal; the output end of each output chopping switch is electrically connected with the output end of the second fully differential amplifier; the input capacitance network is positioned between the pair of input chopping switches and the two pairs of differential input ends; the feedback capacitance network is positioned between the pair of output chopping switches and the two pairs of differential input ends; and the plurality of zeroing switches are positioned between the input and the output of the first fully differential amplifier. The two transconductance amplifiers in the first fully-differential amplifier share the same current, the overall transconductance is doubled compared with single-pair differential input, and the noise of the amplifier is reduced.

An amplifier circuit includes a high frequency input terminal and a high frequency output terminal, amplifiers, an output transformer having an input-side coil and an output-side coil, inductors, and a bypass capacitor. An output end of the amplifier is connected to one end of the input-side coil and one end of the inductor. An output end of the amplifier is connected to the other end of the input-side coil and one end of the inductor. The other end of the inductor, the other end of the inductor, and one end of the bypass capacitor are connected to a midpoint of the input-side coil. One end of the output-side coil is connected to the high frequency output terminal.

Low noise amplifiers (LNAs) with low noise figure are provided. In certain embodiments, an LNA includes a single-ended LNA stage including an input for receiving a single-ended input signal from an antenna and an output for providing a single-ended amplified signal, a balun for converting the single-ended amplified signal to a differential signal, and a variable gain differential amplification stage for amplifying the differential signal from the balun. Implementing the LNA in this manner provides low noise figure, high gain, flexibility in controlling gain, and less sensitivity to ground / supply impedance.

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.

The invention provides a millimeter wave low-noise amplifier which comprises a first-stage amplifying circuit, a second-stage amplifying circuit and a third-stage amplifying circuit, the signal output end of the first-stage amplifying circuit is connected with the signal input end of the second-stage amplifying circuit, and the signal output end of the third-stage amplifying circuit is connected with the signal output end of the third-stage amplifying circuit. The signal output end of the second-stage amplification circuit is connected with the signal input end of the third-stage amplification circuit; according to the low-noise amplifier, the transformer is matched with the transmission line inductor and the transmission line plate capacitor in a combined mode, loss of a passive matching circuit is reduced, and meanwhile large-bandwidth output of the low-noise amplifier is achieved; a cascode amplification structure is adopted, the transformer is combined with a transmission line plate capacitor and a transmission line inductor for impedance matching, and broadband, high-gain amplification and low-noise signal output can be achieved.

The utility model discloses a detection circuit based on power system transistor driving, which comprises a signal input circuit and a direct current bias circuit, the signal input circuit and the direct current bias circuit are both electrically connected with a differential reduction circuit, the differential reduction circuit is electrically connected with an isolation operational amplifier module, and the isolation operational amplifier module is electrically connected with a differential proportion circuit. The differential proportion circuit is electrically connected with the comparator; the differential proportion circuit and the comparator are electrically connected with an MCU. The direct current bias circuit, the differential reduction circuit, the isolation operational amplifier module, the differential proportion circuit and the MCU are all electrically connected with the DCDC isolation system. The sampling isolation voltage operational amplifier ensures that the system is safe and reliable; single power supply sampling is adopted, the cost is reduced, expansion is facilitated, and the detection cost can be greatly reduced when a system needs to detect driving circuits of multiple transistors at the same time; reference voltage is added to the in-phase end through operational amplifier following, and noise interference is reduced.

An amplifier includes a first stage amplifier circuit configured to receive an input voltage and a first multi-stage amplifier circuit and a second multi-stage amplifier circuit branching off from an output terminal of the first stage amplifier circuit and each including a second stage and a third stage. Each of the first multi-stage amplifier circuit and the second multi-stage amplifier circuit may be configured to sample a voltage corresponding to a first bias current corresponding to the second stage and a voltage corresponding to a second bias current corresponding to the third stage in a first phase, and bias the second stage with the voltage corresponding to the first bias current and bias the third stage with the voltage corresponding to the second bias current in a second phase.

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 provides a four-frequency-band reconfigurable load modulation balanced amplifier structure and a regulation and control method thereof, and aims to solve the problems that in the existing power amplifier technology, the efficiency is low during power back-off, and multi-scene requirements cannot be met. The four-frequency-band reconfigurable load modulation balanced amplifier comprises a 90-degree Lange coupler of an input port and a 90-degree Lange coupler of an output port; a two-stage reconfigurable balanced power amplifier composed of an input matching network, a reconfigurable inter-stage matching network and an output-stage pre-matching network and a two-stage control signal power amplifier are combined through an active load modulation technology and a reconfigurable technology, a compact matching network is utilized, and a reconfigurable power amplifier is formed. The efficiency of output power rollback is greatly improved, and the system requirements in different frequency band application scenes can be met.

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.

In accordance with an embodiment, a nested floating inverter dynamic amplifier (FIDA) includes: a first FIDA amplifier comprising a plurality of first inverters switchably coupled to a first reservoir capacitor; and a second FIDA amplifier comprising a plurality of second inverters switchably coupled to a second reservoir capacitor, wherein outputs of the plurality of first inverters are coupled to corresponding inputs of the plurality of second inverters.

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.

The invention discloses a secondary screen cabinet wiring terminal alternating current and direct current voltage identification circuit and a separation and classification method, and relates to the technical field of power electronics and signal identification. According to the invention, firstly, a pre-amplification and AC / DC separation circuit mainly composed of a pre-amplification module, a high-pass filtering module and a low-pass filtering module is used for completing amplification and AC / DC separation after voltage signals of a secondary screen cabinet wiring terminal are acquired; converting the time sequence of the AC voltage signal into image data through a Grubby angle difference field; and then optimizing by using the image data through establishing and training a model based on a convolutional neural network, and continuously iterating to identify and classify the optimal parameter of the AC voltage signal of the secondary screen cabinet wiring terminal. Finally, after model training is completed, the test set is input into the model to determine the accuracy of the model.

A logarithmic detector based on input frequency dynamic compensation comprises a logarithmic amplifier for receiving a radio frequency signal, performing logarithmic conversion and outputting a first current; the frequency discriminator determines first frequency information according to a radio frequency signal, and the first frequency information indicates a first frequency of the radio frequency signal; the control module is used for generating a first control signal and a second control signal based on the first frequency information; wherein the first control signal is used for controlling the magnitude of the second current; the second control signal is used for controlling the magnitude of the third current; the temperature compensation circuit comprises a first transistor with a temperature coefficient and a current adjusting circuit; the first transistor is used for generating a second current changing along with the temperature; the current adjusting circuit adjusts the magnitude of the second current based on the first control signal; and the intercept compensation circuit outputs a corresponding third current based on the second control signal.

According to an aspect of an embodiment, thermal management system for an audio amplifier system may include a heatsink and an active thermal management system. The heatsink may be coupled to an enclosure housing the audio amplifier system and an amplifier of the audio amplifier system. The heatsink may be configured to passively dissipate heat generated in the amplifier to the enclosure and provide structural support for the enclosure. The active thermal management system may include a temperature sensor configured to generate temperature data, a fan configured to provide air to the audio amplifier system to lower temperature measured using the temperature sensor and an embedded computing device configured to obtain the temperature data from the temperature sensor and control the fan based on the temperature data.

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).

The invention discloses an order-editable fractional order circuit. The order-editable fractional order circuit comprises a signal processing circuit module, a bias current output circuit module and a current sampling circuit module, the signal processing circuit module is used for receiving an external input signal; the bias current output circuit module is used for outputting a bias current signal; the current sampling circuit module is used for converting the bias current signal into a voltage signal; the bias current output circuit module is also used for adjusting the voltage signal based on the core MCU to obtain a PWM voltage signal; the bias current output circuit module is also used for converting the PWM voltage signal into an adjusted bias current signal and adjusting a bias current value input into the signal processing circuit module so as to adjust the order of the fractional order circuit to be a target order; and the signal processing circuit module is used for processing an external input signal to obtain an output signal, so that the core MCU controls and outputs a PWM voltage signal, and the order of the fractional order circuit is editable.

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 power amplifier with improved stability, gain, flatness and return loss and reduced the size, which comprises a two-stage power amplifier in balanced cascode topology that consists of a first common-source stage feeding into a first common-gate stage; a second common-source stage feeding into a second common-gate stage; an input matching network for matching the input impedance of the a two-stage power amplifier to a desired signal source impedance; an output matching network for matching the output impedance of the a two-stage power amplifier to a desired load; a first positive feedback path between the gate of the first common-source stage and the drain of the second common-gate (CG) stage and a second positive feedback path between the gate of the second common-source stage and the drain of the first common-gate (CG) stage; a first negative feedback path between the drain of the first common-gate (CG) stage and the gate of the first common-source stage and a second negative feedback path between the drain of the second common-gate (CG) stage and the gate of the second common-source stage; a first inter-stage matching network between the first common-source (CS) stage and the first common-gate (CG) stage; and a second inter-stage matching network between the second common-source (CS) stage and the second common-gate (CG) stage.

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.