17 results about "Multistage amplifier" patented technology

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.

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.

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.

Power amplifier assemblies and multi-stage amplifier systems include a first semiconductor die and a second semiconductor die, each semiconductor die including an integrated transistor. The second semiconductor die is physically and electrically coupled to a die mount interface at a mounting surface of the first semiconductor die in a "flip-chip" orientation. This arrangement provides a multi-stage amplifier including the integrated transistor of the first semiconductor die coupled in a cascaded arrangement with the integrated transistor of the second semiconductor die. The first semiconductor die and the second semiconductor die can be formed of different semiconductor materials.

An amplifier circuit comprises a multi-stage amplifier having a plurality of amplifiers cascaded between an input port Vin and an output port Vout to form a differential input stage and N subsequent gain stages, a capacitive load CL coupled to the output port Vout, and a compensation network coupled to the multi-stage amplifier and configured for positioning Pole-Zero pairs of each stage of the multi-stage amplifier below a unity gain frequency ωt of the multi-stage amplifier when compensated, with Zeros positioned lower than Poles so as to increase the unity gain frequency ωt.

An electroencephalogram signal acquisition circuit, a chip, and an electroencephalogram system, capable of realizing decoupling between a low-pass cut-off frequency and a gain of an acquisition circuit, and reducing the impact of a gain change on a working current, thereby improving the sampling accuracy of the acquisition circuit. The circuit comprises: a plurality of amplifying circuits, used for respectively filtering and amplifying a plurality of electroencephalogram signals to obtain a plurality of filtered and amplified signals, wherein each amplifying circuit comprises a multi-stage amplifier, the multi-stage amplifier includes a first amplifier and a second amplifier, the first amplifier is a programmable-gain amplifier, and the lower limit of the change range of a low-pass cut-off frequency is greater than a low-pass cut-off frequency of the second amplifier; a multiplexer, used for combining the plurality of filtered and amplified signals to obtain a combined signal; and an analog-to-digital converter, used for converting the combined signal into a digital signal.

The application discloses a kind of multistage amplifier, radio frequency circuit and electronic equipment, it is related to multistage amplifier design field, including output selector, first stage amplifier, second stage amplifier, third stage amplifier until N+1 stage amplifier.The first N stage amplifier includes amplifier, power detector and interstage selector, wherein, power detection switch can detect whether the signal that this stage amplifier outputs satisfies preset target power;If yes, then directly output signal is output to output selector by interstage selector and output signal is output by output selector;If not, then continue to transmit output signal to next stage amplifier until output signal satisfies preset target power.Therefore, the power of output signal can be amplified to different preset target power by using one multistage amplifier in the application, the number of multistage amplifier required by radio frequency circuit is reduced, so as to reduce the power consumption and volume of radio frequency circuit.

Amplifiers with bias control for DC coupled single-ended distributed amplifiers of multi-stage amplifiers are described herein. An example amplifier with input bias control includes a distributed amplifier cell having an input coupled to a first distributed transmission line and an output coupled to a second distributed transmission line, an input coupling network coupled between the first distributed transmission line and the input of the distributed amplifier cell, and a bias interface circuit coupled between the input coupling network and the input of the distributed amplifier cell. The amplifier can also include a bias control circuit configured to control an amplifier input bias generated by the bias interface circuit at the input of the distributed amplifier cell.

A sub-nanosecond laser system is disclosed. The sub-nanosecond laser system may include: a pump laser source operable to generate a pump laser beam having a pump wavelength; a first pump beam splitter operable to receive the pump laser beam and split the pump laser beam into at least a first split pump laser beam and a second split pump laser beam; a passively Q-switched seed laser operable to receive the first split pump laser beam and generate a seed laser beam; and an amplifier assembly operable to receive the second split pump laser beam and the seed laser beam. The amplifier assembly may include one or more amplifiers arranged in series in a multi-stage configuration, arranged in a multi-pass configuration, or a combination thereof.

The utility model relates to an over-standard sun-tracking deviation correction sensor, and belongs to the field of medium-high temperature solar heat utilization or tracking type photovoltaic power generation or solar heat power generation. The device is composed of a slit groove, a sun shield, a solar cell, various light collecting mirrors, a dustproof plate and a frame. The upper edge of a U-shaped plate of a slit groove is connected with a sun shield, a solar cell is installed below the sun shield or on a frame bottom plate, a corresponding related light collecting mirror concentrates extremely weak inclined incident light onto the solar cell, and the solar cell can enable extremely weak deviation signals to pass through a light or electric multi-stage amplifier, so that the light or the electric multi-stage amplifier can be amplified. The strong signal is transmitted to a control system of the double-shaft automatic sun tracking machine, and extremely small tracking errors are corrected in time, so that 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 multistage power amplifier linearization system based on broadband communication, which relates to the technical field of broadband communication and comprises a signal receiving module, an alignment module, a frequency domain analysis module, a behavior modeling module, a coefficient generation module, an updating module and a closed-loop control module. A frequency domain analysis module analyzes the aligned predistortion signal copy and the feedback signal in a frequency domain, and extracts cross-multi-sub-band nonlinear distortion and memory effect features; the behavior modeling module constructs and updates a broadband behavior model according to the model, and represents the overall nonlinearity of the multi-stage amplifier; and the coefficient generation module reversely solves a new predistortion coefficient, and after the new predistortion coefficient is applied by the updating module, closed-loop control continuous iteration is performed to realize dynamic correction. According to the system, broadband distortion is accurately captured through frequency domain cross-sub-band features, compensation is optimized through an overall nonlinear model, and output signal distortion of the multi-stage amplifier is restrained. According to the invention, the output linearity of the multi-stage power amplifier in a broadband communication scene is improved, and the anti-interference and spectrum efficiency of the system are enhanced.

The invention discloses a light source device, a light source system and a water window wave band full-coherence free electron laser generation method. The device comprises a harmonic generation unit used for accessing an electron beam and seed laser and generating low-order harmonics; and the at least two stages of cascaded amplifier units are connected with the harmonic generation unit, and are used for accessing low-order harmonic radiation, generating coherent harmonic radiation and tuning the coherent harmonic laser into high-order harmonic radiation so as to obtain the water window wave band full-coherent free electron laser pulse. According to the invention, the multi-stage amplifier units are constructed at the rear stage of the harmonic generation unit, and each subsequent amplifier unit is configured to resonate on a higher harmonic output and radiated by the previous amplifier unit, so that the harmonic radiation of the previous stage is used as an effective seed of the next stage, and the step-by-step up-conversion of the frequency is realized; and converting the frequency of the coherent radiation to a target higher harmonic step by step to obtain the water window wave band full-coherent free electron laser.

This invention relates to an ultra-precise solar tracking sensor, belonging to the fields of medium- and high-temperature solar thermal utilization, tracking photovoltaic power generation, or solar thermal power generation. It consists of a slit slot, a sunshade, solar cells, various concentrators, dustproof plates, and a frame. A sunshade is connected to the upper edge of the U-shaped plate in the slit slot. Solar cells are installed under the sunshade or on the bottom plate of the frame. Corresponding concentrators focus extremely weak, obliquely incident light onto the solar cells. This sensor transforms extremely weak deviation signals into strong signals through optical or electrical multi-stage amplifiers, transmitting them to the control system of a dual-axis automatic solar tracking machine. This timely correction of minute tracking errors maximizes solar energy utilization. It boasts advantages such as high sensitivity, high reliability, and ultra-precise solar tracking exceeding general accuracy.

The application provides an electroencephalogram signal acquisition circuit, a chip and an electroencephalogram system, which can realize decoupling between a low-pass cutoff frequency and a gain of the acquisition circuit, reduce the influence of gain variation on working current and improve the sampling precision of the acquisition circuit. The method comprises the following steps: a plurality of amplification circuits are used for filtering and amplifying a plurality of electroencephalogram signals respectively to obtain a plurality of filtered and amplified signals; wherein each amplification circuit comprises a multi-stage amplifier, the multi-stage amplifier comprises a first amplifier and a second amplifier, the first amplifier is a gain programmable amplifier, and the lower limit of the variation range of the low-pass cutoff frequency is greater than the low-pass cutoff frequency of the second amplifier; a multiplexer is used for merging the plurality of filtered and amplified signals to obtain a merged signal; and an analog-to-digital converter is used for converting the merged signal into a digital signal.

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