61 results about "Multistage amplifier" patented technology

The invention discloses an ultra-precise deviation correction sensor, and belongs to the field of medium-high temperature solar heat utilization or tracking type photovoltaic power generation or solar thermal power generation. The device is composed of a slit light collector, a U-shaped groove and other parts. An extremely weak deviation signal can be converted into a strong signal through an optical or electric multi-stage amplifier, and the strong signal is transmitted to a control system of the automatic sun tracking machine, so that an extremely small tracking error is corrected in time, and the utilization rate of solar energy is improved to the maximum extent. The system has the advantages of high sensitivity, high reliability, ultra-precise sun tracking higher than general accuracy and the like.

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

Described is a system for modulating power to one or more radio frequency (RF) amplifiers to suppress undesired output signal components, improve linearity and reduce noise. The described systems and techniques enable shaping of spectral components introduced via an amplifier bias voltage owing to transitions among bias discrete states. The systems and techniques facilitate operation of multilevel, RF amplifiers under a wider range of operating conditions. In embodiments, the system includes modulators coupled to a supply terminal port of each of the one or more amplifiers to modulate the voltage levels supplied to the one or more amplifiers. The outputs of the modulators may be combined to provide a combined signal coupled to the amplifiers. A delay circuit delays switching of at least one of the power modulators relative to other modulator, by a variable time delay. This results in suppression of undesired output signal components of the amplifier output.

The invention discloses a current self-protection circuit for a linear power amplifier, relates to the technical field of Tokamak device diagnosis, and solves the problem that probe data acquisition is affected due to the fact that an existing Tokamak device probe diagnosis circuit stops working of a power amplifier during overcurrent. According to the scheme, a multi-stage amplifier is connected with the input of a class-B power amplifier, the output of the class-B power amplifier is connected with a driving current limiting circuit, and the driving current limiting circuit is connected with a probe; the driving current limiting circuit is connected with the input of the multi-stage amplifier through the feedback circuit, is connected with an NPN transistor of the class B power amplifier through the forward current limiting circuit, and is connected with a PNP transistor of the class B power amplifier through the negative current limiting circuit; the driving current limiting circuit provides two different resistance values; by arranging the feedback loop, when overcurrent occurs in the probe diagnosis circuit, the current is pulled down instead of stopping the power amplifier, and probe data acquisition is maintained.

The invention relates to a multi-stage amplifier, an analog-to-digital converter and electronic equipment, and the multi-stage amplifier comprises a first-stage amplifier which comprises a first step-down charge pump and is used for carrying out the first-stage amplification of a to-be-amplified signal and outputting a first amplified signal; the second-stage amplifier comprises a second step-down charge pump and a second amplifier and is used for carrying out second-stage amplification on the first amplification signal and outputting a second amplification signal; and the third-stage amplifier comprises a boost charge pump and a third amplifier and is used for carrying out third-stage amplification on the second amplification signal and outputting a third amplification signal. According to the multi-stage amplifier, low-power-consumption, high-gain and large-swing output can be achieved in the multi-stage amplifier, voltage rising and falling adjustment is achieved among different amplification stages through a multi-stage dynamic power supply framework, and therefore balance among gain, speed and power consumption is achieved.

An apparatus includes a multi-stage amplifier and a feedback switch. The multistage amplifier includes a first amplifier having a first input, a second input, and an output, a second amplifier having an input and an output, wherein the input of the second amplifier is coupled to the output of the first amplifier, and a third amplifier having an input and an output, wherein the input of the third amplifier is coupled to the output of the first amplifier. The feedback switch is coupled between the output of the third amplifier and the second input of the first amplifier.

The invention discloses a radio frequency amplification device based on bias voltage. The device comprises a signal amplification link circuit and a biasing circuit, the signal amplification link circuit comprises a resistor unit and a multi-stage amplifier chip; the resistor unit is connected with the biasing circuit; the biasing circuit is electrically connected with the multiple stages of amplifier chips; the bias circuit is used for outputting a fluctuation bias voltage signal to the multiple stages of amplifier chips; wherein the fluctuation bias voltage signal positively changes along with the resistance change proportion of the resistance unit, and when the resistance change proportion is 1, the fluctuation bias voltage signal is preset bias voltage; and the resistance change proportion of the resistor unit is the same as the resistance change proportion of the fixed resistor on the multi-stage amplifier chip. According to the scheme, the large fluctuation of the quiescent current is remarkably improved.

The invention relates to a method for realizing radio frequency path power calibration processing for a large-scale MIMO multi-stage amplifier. The method comprises the following steps: acquiring a single-stage amplifier temperature compensation coefficient Ki at the same frequency point and different temperatures based on single-stage amplifier temperature and power data; multi-stage amplifier temperature compensation coefficients Kj of different frequency points are obtained based on the multi-stage amplifier temperature and power data; searching a temperature compensation coefficient Kp closest to the temperature compensation coefficient Kj of the multi-stage amplifier at different frequency points; and performing power compensation by using a power interval corresponding to the temperature compensation coefficient Kp at a certain frequency point. By adopting the method, the system, the device, the processor and the computer readable storage medium for realizing the radio frequency path power calibration processing for the large-scale MIMO multi-stage amplifier, the problem of rapid output power calibration of the large-scale MIMO multi-radio frequency path can be solved, and the accuracy of the output power in the radio frequency path is further improved. The calibration precision of the output power of the radio frequency path is high, the calibration granularity is accurate and controllable, and the captured power compensation value is close to the optimum.

Methods and devices for reducing DC current consumption of a multi-stage LNA amplifier. According to one aspect, first and second amplification stages are stacked to provide a common conduction path of a DC current. The first stage includes a common-source amplifier, the second stage includes a common-drain amplifier. Coupling between the two stages is provided by series connection of load inductors of the respective stages and a capacitor coupled at a common node between the inductors. According to another aspect, a current splitter circuit is used to split a current to the first stage according to two separate conduction paths, one common path to the two stages, and another separate from the second stage. According to yet another aspect, the current splitter circuit includes a feedback loop that controls the splitting of the current so to maintain a constant current through the common path.

In a multi-stage amplifier, a plurality of amplifier circuits are connected in series, and the amplifier circuit has a 0 dB frequency at which magnitude of a normalized transfer function normalized at a low frequency gain becomes 1 at a frequency other than a direct current.

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 branched 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 and a voltage corresponding to a second bias current in a first stage, in the second stage, the second stage is biased with a voltage corresponding to a first bias current corresponding to the second stage and the third stage is biased with a voltage corresponding to a second bias current corresponding to the third stage.

A multi-stage amplifier includes a plurality of single-stage differential amplifiers that are connected in a cascade arrangement. The single-stage differential amplifiers include a first single-stage differential amplifier and a second single-stage differential amplifier. The first single-stage differential amplifier has a first output network. The second single-stage differential amplifier has a second output network. A common-mode (CM) node of the second output network is shorted to a CM node of the first output network.

A system and method for improved noise performance of an audio amplifier are provided. In one example, the system includes a multi-stage amplifier including at least a first stage amplifier and a second stage amplifier. The system also includes a plurality of switches disposed within the multi-stage amplifier to configure the multi-stage amplifier. The system also includes a control signal configured to control the multi-stage amplifier to a normal amplification mode or a mute state, wherein the multi-stage amplifier is adapted to amplify an input signal in the normal amplification mode, the multi-stage amplifier is adapted to output a zero signal in the mute state, and an internal amplification stage of the multi-stage amplifier is disabled in the mute state, and an output stage of each of at least the first stage amplifier and the second stage amplifier is electrically shorted and / or shorted to a fixed bias voltage in the mute state.

Various examples relate to a frequency-compensated amplifier circuit including a first multi-stage amplifier including a first amplifier input node, a first amplifier output node, and a first amplifier intermediate node. A first feedback path between the first amplifier input node and the first amplifier output node includes a feedback resistor. A second feedback path between the first amplifier output node and the first amplifier intermediate node includes a first capacitor and a portion of the feedback resistor. A first switch circuit can be electrically coupled to the first capacitor and the feedback resistor. The first switch circuit can have a first state in which the first capacitor is coupled to a first tap point of the feedback resistor and the portion of the feedback resistor has a first value. The first switch circuit can also have a second state in which the first capacitor is coupled to a second tap point of the feedback resistor and the portion of the feedback resistor has a second value different from the first value.

Power amplifier assemblies and multiple-stage amplifier systems include first and second semiconductor dies, each of which includes an integrated transistor. The second semiconductor die is physically and electrically coupled to a die-mounting interface at a mounting surface of the first semiconductor die in a "flip-chip" orientation. This arrangement provides a multiple-stage amplifier that includes the integrated transistor of the first semiconductor die coupled in a cascade arrangement with the integrated transistor of the second semiconductor die. The first and second semiconductor dies may be formed from different semiconductor materials.

The invention discloses a radio frequency amplification device based on bias current. The radio frequency amplification device based on the bias current comprises a bias circuit module and a signal amplification link module, the signal amplification link module comprises a resistor unit and a multi-stage amplifier unit; the bias circuit module comprises a reference current source unit, a first current mirror and conversion unit and a second current mirror and conversion unit; the reference current source unit is electrically connected with the resistor unit and the first current mirror and conversion unit, and the first current mirror and conversion unit and the second current mirror and conversion unit are used for performing current operation according to a reference current signal and outputting a control current signal to the multi-stage amplifier unit; the control current signal is in positive correlation with the resistance change proportion of the resistor unit, and the resistance change proportion of the resistor unit is the same as the resistance change proportion of the resistor in the multi-stage amplifier unit, so that the fluctuation of the quiescent current output by the radio frequency amplification device is reduced, and the performance of the radio frequency amplification device is improved.

The utility model relates to an analog integrated circuit. The utility model discloses a low-voltage integrated circuit operational amplifier, and aims to solve the problem of higher working voltage of an operational amplifier in the prior art by improving a circuit structure and reducing the number of inter-electrode voltage drops of transistors of a direct current channel of the amplifier. The low-voltage integrated circuit operational amplifier comprises a multi-stage amplifier formed by transistors, and is characterized in that a direct current channel of the amplifier only comprises a transistor base-emitter voltage drop. According to the integrated circuit operational amplifier, the number of inter-electrode voltage drops of transistors of a direct-current channel of the amplifier is reduced by improving the circuit structure, and the integrated circuit operational amplifier has the characteristics of low power consumption and high gain while meeting low-voltage work and can be applied to systems such as power management, portable equipment, sensors and communication equipment.

An amplifier device may include at least one two-stage amplifier package, where an amplifier of a first amplification stage of the amplifier package may be aligned opposite to amplifiers of a second amplification stage of the amplifier package. The amplifier device may be a three-stage amplifier device, where the second stage of the two-stage amplifier package is coupled to amplifiers of a final (third) stage, which may be in a Doherty configuration. The amplifiers of the second stage may be arranged in any of a class AB configuration, a Doherty configuration, a multi-stage Doherty configuration (with amplifiers of the final amplification stage), or a multi-driver, multi-stage Doherty configuration. One or more passive components used for inter-stage impedance matching may be disposed outside of the two-stage amplifier package. Amplifiers of the first, second, and third amplification stages may each be gallium nitride (GaN) amplifiers, in some embodiments.

The present invention provides a multi-stage amplifier, which is used for amplifying a multi-carrier signal including two carrier frequencies (f1, f2). The multi-stage amplifier (1) comprises: N (N is an integer greater than 2) amplifiers, wherein the amplifier of the k+1th stage is cascade-connected to the amplifier of the kth stage, respectively amplifying the multi-carrier signal; and an extraction circuit (9), whose input is connected to the output of the amplifier of the jth stage, and whose output provides a compensation signal to the input of the amplifier of the j+1th stage or the output of the amplifier of the j+1th stage, wherein the extraction circuit comprises: a filter circuit (11) connected to the output of the amplifier of the jth stage, extracting a deformed frequency component of n times (n is an integer greater than 1) the differential frequency f2-f1; a phase shifter (13) connected in series to the filter circuit, shifting the phase of the deformed frequency component; and a gain adjustment circuit (15) connected in series to the phase shift circuit, adjusting the amplitude of the deformed frequency component, and generating a compensation signal.

Power amplifier assemblies and multiple-stage amplifier systems include first and second semiconductor dies, each of which includes an integrated transistor. The second semiconductor die is physically and electrically coupled to a die-mounting interface at a mounting surface of the first semiconductor die in a “flip-chip” orientation. This arrangement provides a multiple-stage amplifier that includes the integrated transistor of the first semiconductor die coupled in a cascade arrangement with the integrated transistor of the second semiconductor die. The first and second semiconductor dies may be formed from different semiconductor materials.

The application discloses a light source device, a system and a water window band full-coherent free electron laser generating method. The device comprises: a harmonic generation unit for connecting an electron beam and a seed laser and generating low-order harmonics; at least two cascaded amplifier units connected with the harmonic generation unit, for connecting the low-order harmonic radiation and generating coherent harmonic radiation, and for tuning the coherent harmonic laser to high-order harmonic radiation to obtain water window band full-coherent free electron laser pulses. The application constructs a multi-stage amplifier unit in the rear stage of the harmonic generation unit, and each subsequent amplifier unit is configured to resonate on a high-order harmonic of the radiation output by the previous amplifier unit, so that the harmonic radiation of the previous stage is used as the effective seed of the subsequent stage, the frequency is up-converted stage by stage, the frequency of the coherent radiation is converted to the target high-order harmonic stage by stage, and the water window band full-coherent free electron laser is obtained.

The present invention discloses a K-band radio frequency front-end transceiver processing module, comprising a main cavity disposed within a housing, wherein a plurality of signal transceiver transmission link channels are disposed within the main cavity, each signal transceiver transmission link channel comprising a connected radio frequency receiving channel provided with a radio frequency receiving microwave circuit and a radio frequency transmitting channel provided with a radio frequency transmitting microwave circuit, the radio frequency receiving channel comprising a plurality of mutually connected branch channels, wherein two connected branch channels are mutually connected vertically, and the radio frequency receiving microwave circuit comprises a multi-stage amplifier connected in series, wherein an amplifier is disposed on each branch channel. By disposing mutually vertically connected branch channels, the cavity in which the amplifier is disposed is spatially isolated, and even if the use of amplifiers is increased in the circuit, isolation between the amplifiers can be well achieved, thereby improving gain while avoiding the occurrence of self-excitation.

A power amplifier circuit includes a first amplifier transistor, a first nonlinear element, and a current control circuit. The first amplifier transistor has a base or a gate into which a first signal is input, a collector or a drain from which a signal resulting from amplification of the first signal is output, and an emitter or a source that is grounded. The first nonlinear element is connected between the collector or the drain of the first amplifier transistor and the base or the gate of the first amplifier transistor. The current control circuit is connected between the ground and the base or the gate of the first amplifier transistor and controls current flowing through the first nonlinear element.

The invention discloses a phase-locked amplifier and a resistance determination method of the phase-locked amplifier. The lock-in amplifier comprises an input signal channel, a multi-stage amplifier and an output signal channel; the multi-stage amplifier comprises a first amplifier, a second amplifier and a third amplifier; the high-pass filter is arranged between the first amplifier and the second amplifier; the third amplifier is arranged between the second amplifier and the output signal channel; the first amplifier is used for converting the obtained current signal to be measured into a voltage signal to be measured and amplifying the voltage signal to obtain a first amplified signal; the high-pass filter carries out filtering processing on the first amplification signal to obtain an AC voltage signal; the second amplifier and the third amplifier sequentially amplify the AC voltage signal to obtain a third amplified signal; and the output signal channel is used for outputting the third amplified signal for signal measurement. According to the phase-locked amplifier, the accuracy of an alternating current signal measurement result in a weak signal can be improved.

The invention discloses a control circuit and device of a Gamma driving circuit, and generally relates to the technical field of display panels. The Gamma driving circuit comprises a multi-stage amplifier and a plurality of signal lines, wherein the amplifier is used for controlling the signal lines to output different gray-scale signals; the control circuit comprises a signal input control circuit, a logic control circuit and a bleeder circuit. The signal input control circuit is connected with the first input end and the logic control circuit and outputs a first control signal to the logic control circuit; the logic control circuit is connected with the signal input control circuit, the bleeder circuit and the amplifier, generates a second control signal and a third control signal according to the first control signal, transmits the second control signal to the amplifier, and transmits the third control signal to the bleeder circuit; and the bleeder circuit is connected with the signal line and the logic control circuit, and releases the residual signal in the signal line under the control of the third control signal.

A multistage amplifier (10) according to the present invention comprises, in order, a first amplification unit (11) having a first amplification circuit (111), and a second amplification unit (12) having a second amplification circuit (121). At a frequency that gives an extreme value of a normalized transfer function of the first amplification unit, a normalized transfer function of the second amplification unit has an opposite extreme value. The first amplification unit includes a first amplification circuit, a first inductor connected in parallel to the first amplification circuit, a first resistor, and a second inductor connected in series to the first resistor. The second amplification unit includes a second amplification circuit, a third inductor connected in parallel to the second amplification circuit, and a second resistor.　As a result, the present invention can provide a multistage amplifier capable of suppressing deterioration in frequency characteristics.

The present invention provides an amplifier circuit and a high-order damping circuit. The amplifier circuit includes an input stage amplifier, at least one intermediate stage amplifier and an output stage amplifier cascaded between an input port and an output port of the amplifier circuit. The amplifier circuit also includes a compensation capacitor coupled between the output port of the amplifier circuit and the output port of the input stage amplifier and a first high-order damping circuit coupled to the output port of the intermediate stage amplifier. The present invention can enhance the stability of a multi-stage amplifier while not reducing the in-band gain of the multi-stage amplifier.

An amplifier circuit includes a multi-stage amplifier, a first feedback circuit, and a second feedback circuit. The multi-stage amplifier includes a first-stage amplifier, a last-stage amplifier, and at least one intermediate-stage amplifier cascaded between the first-stage amplifier and the last-stage amplifier. The first feedback circuit is used to couple the positive output terminal of the last-stage amplifier back to the positive input terminal of the at least one intermediate-stage amplifier, or to couple the negative output terminal of the last-stage amplifier back to the negative input terminal of the at least one intermediate-stage amplifier. The second feedback circuit is used to couple the positive output terminal of the last-stage amplifier back to the positive input terminal of the last-stage amplifier, or to couple the negative output terminal of the last-stage amplifier back to the negative input terminal of the last-stage amplifier.

The present invention discloses a radio frequency transceiver assembly and a phased array radar, comprising a signal switching module, a transmitting module, a receiving module and a ring isolator, wherein the signal switching module is connected with a radio frequency connector, the transmitting module comprises a first gain temperature self-adjusting circuit, a first phase temperature self-adjusting circuit and a first multi-stage amplifier connected in cascade, the first gain temperature self-adjusting circuit or the first phase temperature self-adjusting circuit is connected with the third signal end of the signal switching module, the receiving module comprises a limiter, a second multi-stage amplifier, a second phase temperature self-adjusting circuit and a second gain temperature self-adjusting circuit connected in cascade, the second gain temperature self-adjusting circuit or the second phase temperature self-adjusting circuit is connected with the second signal end of the signal switching module, the ring isolator is respectively connected with the first multi-stage amplifier and the limiter, and the ring isolator is also connected with an antenna interface. The present invention is conducive to improving the situation that the gain and phase of the radio frequency transceiver assembly change with temperature.