a composite amplifier

Abstract

The invention discloses a composite amplifier. Voltage amplification is carried out on a direct current signal, a low-frequency signal and a high-frequency signal of input signals through a direct current amplification module and a broadband amplification module respectively, wherein the direct current amplification module adopts a high-precision operational amplifier. The amplification times of the direct current and low-frequency signals are adjusted through a first feedback module. The characteristic of high direct current precision is realized. The broadband amplification module amplifiesthe high-frequency signal and an output signal of the direct current amplification module by adopting amplification devices such as a transistor and the like. The characteristic of high bandwidth is realized. The transistor has good heat dissipation performance, can bear higher voltage , and has the characteristic of high voltage. The impedance of an output signal of the amplified signal is reduced through an output driving module. The output driving capability of the composite amplifier is improved, and the amplification factor of a high-frequency signal is adjusted through a second feedbackmodule, so that the composite amplifier has the characteristics of high bandwidth, high precision, high driving capability and high direct current precision at the same time.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a composite amplifier. Background technique [0002] An amplifier is a device that can amplify the voltage or power of an input signal, and is an important component for processing signals in electronic technology tools. According to the characteristics of the amplifier, the amplifier is usually divided into different types to highlight some characteristics of the amplifier. For example, high-precision amplifiers refer to those amplifiers with small offset voltage, small temperature drift, and high gain and common-mode rejection ratio; Broadband amplifiers are amplifiers that have a very wide frequency band. [0003] However, various performances of amplifiers are mutually restricted. For example, high-precision amplifiers do not have high-bandwidth characteristics, and broadband amplifiers do not have high-voltage characteristics. Therefore, there is an urgent need for a c...

AI Technical Summary

Problems solved by technology

When the integrated broadband high-voltage amplifier outputs high-frequency and large-amplitude signals, the internal temperature of the amplifier will rise sharply, resulting in a sharp deterioration in performance. At the same time, the slew rate of the integrated broadband high-voltage amplifier is limited. These reasons cause the integrated broadband high-voltage amplifier to output high-frequency , the ability of large amplitude signal is not ideal

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