Transconductance amplifier adopting signal attenuation technology and method

Abstract

The invention relates to a transconductance amplifier adopting the signal attenuation technology and a method. The transconductance amplifier comprises differential input-stage input voltages Vin+ and Vin-, and differential input currents are generated. Power voltage VDD is accessed to a signal attenuation circuit, signal attenuation is carried out on the differential input currents, and a current attenuation signal is generated. The power voltage VDD has access to a bias current source, communication is carried out according to the current attenuation signal, and bias currents are output to a first current mirror and a second current mirror. The first current mirror and the second current mirror both copy the bias currents, and copied currents are generated to be transmitted to a third current mirror. The unity-gain bandwidth is increased through the third current mirror, gain amplification is carried out on the copied currents, and an amplifying signal Iout is output. Compared with the prior art, the influence between input and output voltages is low, no additional pole is introduced, and high linearity, high gain and high-precision amplification are achieved.

Description

technical field [0001] The invention relates to the technical field of amplifiers, in particular to a transconductance amplifier and a method using signal attenuation technology. Background technique [0002] The transconductance operational amplifier (OTA) is a basic building block of many analog circuit designs, such as multipliers, continuous-time filters, voltage-controlled oscillators, continuous-time sigma-delta converters, etc., all contain transconductance amplifiers. This is an analog device whose input analog value is voltage and output value is current. The ratio of input voltage to output current is called transconductance. The most important indicator of a transconductance amplifier is linearity, which means the degree of distortion in converting voltage to current. The smaller the value, the better the performance of the transconductance amplifier, especially for high-resolution sigma-delta analog-to-digital converters. converters, they need a high linearity t...

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Problems solved by technology

On the other hand, excessive power supply voltage will lead to an increase in overall circuit power consumption, which cannot meet the application requirements of current integrated circuit design

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