Low voltage self-modulation variable gain amplifier circuit and hybrid integrated circuit

Abstract

The invention relates to a low-voltage self-modulation variable gain amplifier circuit and a hybrid integrated circuit. The amplifier circuit comprises a first stage variable gain amplifier circuit (10), a second stage variable gain amplifier circuit (20), a root-mean-square negative feedback detection circuit (30), a first capacitor (C1), a second capacitor (C2), a first input end (Vi+), a secondinput end (Vi-), a first output end (Vo+) and a second output end (Vo-). According to the low-voltage self-modulation variable gain amplifier circuit and the hybrid integrated circuit provided by theembodiment of the invention, using the root-mean-square negative feedback detection circuit, a substrate bias signal in the variable gain amplifier circuit can be modulated in real time according toan input signal and an output signal of the variable gain amplifier circuit; and thus, a gain of the variable gain amplifier circuit is modulated, the dynamic modulation in a wide gain range is implemented, and the stability of system work is increased.

Description

technical field [0001] The invention belongs to the technical field of analog integrated circuits, and in particular relates to a low-voltage self-modulating variable gain amplifier circuit and a hybrid integrated circuit. Background technique [0002] Gain amplifier is a very important unit circuit module, which is widely used in the field of analog / mixed integrated circuit design, such as: AFE analog front-end, ADC converter, DC / DC converter and other circuit systems, often in the entire analog / mixed It plays a key role in the integrated circuit system, that is, the gain of amplifying the input signal. As a highly versatile gain amplifier, the variable gain amplifier can adjust and control its magnification according to the application requirements, thereby improving the dynamic characteristics of the system, reducing power and improving stability. [0003] The traditional variable gain amplifier circuit usually adopts the Gilbert unit (Gilbert unit) circuit. By controlli...

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Problems solved by technology

[0003] The traditional variable gain amplifier circuit usually adopts the Gilbert unit (Gilbert unit) circuit. By controlling the transconductance of the input tube, the change of the current is controlled, so as to realize the change of the gain. However, this method makes the voltage margin large and needs to be used Larger voltage environment, but limited in low power application scenarios

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