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Automatically-adjusted variable gain amplification circuit and implementation method thereof

A gain amplification circuit and automatic adjustment technology, applied in gain control, amplification control, amplifier input/output impedance improvement, etc. low-complexity effects

Active Publication Date: 2019-07-23
GUANGZHOU INTELLIGENT CITY DEV INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005]However, the existing automatic gain control circuit requires a digital circuit to cooperate with the change of the control gain, which does not have continuity, and the operation complexity is relatively high

Method used

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  • Automatically-adjusted variable gain amplification circuit and implementation method thereof
  • Automatically-adjusted variable gain amplification circuit and implementation method thereof
  • Automatically-adjusted variable gain amplification circuit and implementation method thereof

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Embodiment Construction

[0035] The present invention will be further explained and described below in conjunction with the accompanying drawings and specific embodiments of the description.

[0036] An embodiment of the present invention provides an automatically adjusted variable gain amplifier circuit, including:

[0037] The input impedance matching circuit is used to receive the input signal and determine the frequency band of the variable gain amplifier circuit based on the preset condition of the input matching and the band-pass filter technology;

[0038] A negative feedback control voltage conversion circuit, configured to convert the control voltage of the first output variation range corresponding to the input signal into a voltage of a second output variation range, the first output variation range being larger than the second output variation range;

[0039] The main operational amplifier circuit is used to amplify the control voltage;

[0040] The output matching circuit is used to output...

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Abstract

The invention discloses an automatically-adjusted variable gain amplification circuit and an implementation method thereof. The circuit comprises an input impedance matching circuit, a negative feedback control voltage conversion circuit, a main body operation amplification circuit and an output matching circuit, wherein the output end of the input impedance matching circuit is connected with theinput end of the negative feedback control voltage conversion circuit, the output end of the negative feedback control voltage conversion circuit is connected with the input end of the main body operation amplification circuit, and the output end of the main body operation amplification circuit is connected with the input end of the output matching circuit. The gain change does not need to be controlled through a digital circuit in a matched mode, automatic gain change adjustment is achieved only by conducting negative feedback through an analog circuit, the operation difficulty is low, and the automatically-adjusted variable gain amplification circuit can be widely applied to the technical field of integrated circuits.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to an automatically adjusted variable gain amplifier circuit and its realization method. Background technique [0002] In the digital-analog hybrid integrated circuit system, it is often necessary to amplify or attenuate the input signal of the analog signal, and the variable gain amplifier (VGA) is an important module to realize this function. The gain of VGA can change with the control signal, and it is widely used in disk reading drive circuits, disk data storage systems, TV tuners, electromagnetic meters, high-frequency filters, medical electronic equipment, etc., in wireless communication and transceiver systems, also plays an important role. [0003] When there is multipath attenuation and path loss, the typical value of the dynamic range required by the received signal is greater than 100dB. Since the smallest detectable signal is on the order of microvolts (μV)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03G3/30H03F1/56
CPCH03G3/3042H03F1/56
Inventor 胡建国吴劲王德明
Owner GUANGZHOU INTELLIGENT CITY DEV INST
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