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

A gain amplifier and self-modulation technology, which is applied in the directions of controlling the components of the amplifier, gain control, and amplification control, and can solve problems such as large voltage margins

Active Publication Date: 2018-01-19
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

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Embodiment Construction

[0039] The present invention provides a low-voltage self-modulation variable gain amplifier circuit and a hybrid integrated circuit. Compared with the existing amplifier circuit, it adopts a two-stage amplifier circuit composed of the same structure, and adopts the offset modulation technology to reduce The threshold voltage of the MOS transistor reduces the voltage margin of the variable gain amplifier circuit, thereby reducing the power supply voltage and power consumption required for circuit operation, and realizes dynamic modulation of a wide gain range, increasing the stability of the system operation. In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the working principle and connection relationship will be described in detail below with reference to the accompanying drawings and specific implementation examples.

[0040] like figure 1 as shown, figure 1 The structure schematic diagram of the CMOS...

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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...

Claims

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Application Information

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IPC IPC(8): H03G1/00H03G3/00H03G3/30
Inventor 李娅妮王旭朱樟明陈弘
Owner XIDIAN UNIV
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