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A Wide Range Variable Gain Amplifier

A gain amplifier and amplifier technology, used in differential amplifiers, DC-coupled DC amplifiers, gain control, etc., can solve the problems of poor performance stability, small signal dynamic range, and low linearity of open-loop variable gain amplifiers

Active Publication Date: 2017-12-08
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the variable gain amplifier includes a closed-loop variable gain amplifier and an open-loop variable gain amplifier. The performance stability of the open-loop variable gain amplifier is poor, the linearity is low, and the dynamic range of the signal is small.

Method used

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  • A Wide Range Variable Gain Amplifier
  • A Wide Range Variable Gain Amplifier
  • A Wide Range Variable Gain Amplifier

Examples

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Effect test

Embodiment 1

[0044] Such as figure 1 What is shown is a schematic structural diagram of a wide-range variable gain amplifier provided by an embodiment of the present invention, including: a pre-circuit 1, a source follower circuit 2, a programmable attenuation circuit 3, and a fixed gain amplifier 4;

[0045] The first end of the front end circuit 1 is connected to the signal input terminal Vin, the second end of the front end circuit 1 is connected to the ground port AVSS, and the third end of the front end circuit 1 is connected to the first input end of the source follower circuit 2. The second input terminal of the source follower circuit 2 is connected to the first bias voltage VB1; the output terminal of the source follower circuit 2 is connected to the first input terminal of the programmable attenuation circuit 3; the second input terminal of the programmable attenuation circuit 3 Connected to the reference voltage Vref; the output terminal of the programmable attenuation circuit 3 is ...

Embodiment 2

[0049] See figure 1 On the basis of the first embodiment, the front-end circuit 1 includes a first capacitor C1 and a second capacitor C2. The first terminal of the first capacitor C1 is connected to the signal input terminal Vin, and the second terminal of the first capacitor C1 is connected to the signal input terminal Vin. The first terminal of the second capacitor C2 is connected to the first input terminal of the source follower circuit 2; the second terminal of the second capacitor C2 is connected to the ground port AVSS.

[0050] It should be noted that the first capacitor C1 prevents direct current signals and low frequency signals from affecting the input signal, and the second capacitor C2 has a noise reduction function.

Embodiment 3

[0052] See figure 1 On the basis of the second embodiment, the source follower circuit 2 includes: a first transistor M1 and a second transistor M2. Both the first transistor M1 and the second transistor M2 are P-channel field effect transistors, wherein,

[0053] The gate of the first transistor M1 is connected to the first bias voltage VB1, the source of the first transistor M1 is connected to the power supply AVDD, the drain of the first transistor M1 is respectively connected to the source of the second transistor M2 and the programmable attenuation circuit 3 The first input terminal of the second transistor M2 is connected to the ground terminal AVSS.

[0054] It should be noted that the source follower circuit 2 has a boosting function. When the input signal voltage is too low, the input signal is boosted to meet higher circuit requirements.

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Abstract

The invention provides a wide-range variable gain amplifier, including: a pre-circuit, a source follower circuit, a programmable attenuation circuit and a fixed gain amplifier; the input signal enters the source follower circuit through the pre-circuit, and the source follower circuit will The input signal from the pre-circuit is boosted to obtain a boosted input signal, and the boosted input signal is passed to the programmable attenuation circuit. The programmable attenuation circuit selects the amount of gain attenuation and performs gain processing on the boosted input signal. A first gain signal is obtained, and the first gain signal is transmitted to a fixed gain amplifier, and the fixed gain amplifier performs gain processing on the first gain signal to obtain a required gain signal. The wide-range variable gain amplifier of the embodiment of the present invention realizes the function of variable gain by adjusting the resistance value of the programmable attenuation circuit, thereby changing the gain attenuation amount.

Description

Technical field [0001] The present invention relates to the technical field of integrated circuits, in particular to a wide-range variable gain amplifier. Background technique [0002] Variable gain amplifiers are widely used in communication systems and image, audio and video analog signal processing circuits. The above-mentioned communication signal and the image, audio and video analog signal strength are not constant, and the signal amplitude varies widely. For this type of large swing input signal, a variable gain amplifier is used. [0003] In the prior art, the variable gain amplifier includes a closed loop variable gain amplifier and an open loop variable gain amplifier. The open loop variable gain amplifier has poor performance stability, low linearity, and a small signal dynamic range. Summary of the invention [0004] In order to solve the above-mentioned problem, the embodiment of the present invention provides a wide-range variable gain amplifier, which can enhance th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/32H03F3/45H03G3/20
Inventor 朱樟明樊迪王静宇潘鹏祖杨银堂
Owner XIDIAN UNIV
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