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Gain control circuit

A gain control circuit and gain control technology, which are applied in gain control, amplification control, control of components of amplification devices, etc., can solve problems such as the inability to meet high data rate requirements, achieve excellent linear operation, convenient circuit complexity, The effect of wide bandwidth

Active Publication Date: 2012-06-06
HONG KONG APPLIED SCI & TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nevertheless, the architecture typically operates within a limited bandwidth, which cannot meet the high data rate requirements of modern applications such as audio processing, video processing, and wireless communications

Method used

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Embodiment Construction

[0026] The invention is described in detail herein in accordance with certain preferred embodiments. In order to fully and clearly describe the details of the present invention, certain descriptive terms will be given to various components such as operational amplifiers, amplifiers, transistors, resistors, and diodes. It should be understood by those skilled in the art that descriptive terms are provided for easy identification of components during the description, but not to limit the invention to specific descriptions.

[0027] Figure 5 A known input buffer 500 using voltage feedback to provide gain control with pre-distortion is shown. A differential input signal voltage is buffered by operational amplifiers (OPA) OPA1 501 and OPA2 502 to form the same voltage across resistor RE503. A signal current i_ac is generated across both ends of RE 503 . In addition, a gain control current pair I_gain of the same magnitude is formed on the collectors of Q1 and Q2. As a result, ...

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PUM

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Abstract

A gain control circuit (100) including a resistor (120) with a first terminal and a second terminal; an operational amplifier (110) with an inverting terminal (111) thereof electrically coupled to the first terminal of the resistor (120); a non-inverting terminal (112) thereof; and an output terminal (113) thereof; an amplifier circuit (130) for transforming the voltage change of the operational amplifier (110) output into a substantially exponential current change; wherein the output of the amplifier circuit (130) is electrically coupled to the inverting terminal (111) of the operational amplifier (110).

Description

technical field [0001] The present invention relates generally to analog circuits, and more particularly to gain control circuits. Background of the invention [0002] In many electronic systems, weak signals generated by sensors or transducers are captured and required to be amplified at the front end of the system to increase the signal strength for further processing of the information carried by this signal. For example, known voltage multipliers use voltage buffering to convert an input signal voltage into a corresponding signal voltage. In some cases, signal transitions are preferably accompanied by gain adjustments for different signal strengths. The gain for weak signals is arranged to be higher than the gain for strong signals. With this modification, a high resolution weak signal can be obtained while keeping the strong signal within the dynamic range. The aforementioned gain adjustments can be automated by using devices that provide controlled impedance, such a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03G3/20
CPCH03G1/0023
Inventor 麦哲亚王俊辉梁立志邝小飞何雪茵邝国权
Owner HONG KONG APPLIED SCI & TECH RES INST