Transconductance amplifier adopting signal attenuation technology and method

A transconductance amplifier and signal attenuation technology, which is applied in the direction of DC-coupled DC amplifiers, amplifiers, differential amplifiers, etc., can solve problems such as failure to meet application requirements, increase in circuit power consumption, etc., to increase anti-interference ability and improve slew rate , the effect of increasing the voltage swing

Pending Publication Date: 2017-02-15
GUANGXI NORMAL UNIV
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Problems solved by technology

On the other hand, excessive power supply voltage will lead to an increase in overall circuit p...

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  • Transconductance amplifier adopting signal attenuation technology and method
  • Transconductance amplifier adopting signal attenuation technology and method
  • Transconductance amplifier adopting signal attenuation technology and method

Examples

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Embodiment 2

[0116] An operation method of a transconductance amplifier applying signal attenuation technology, comprising the following steps:

[0117] Step S1. Differential input stage 1 inputs voltage Vin+ and voltage Vin- to generate differential input current;

[0118] Step S2. The signal attenuation circuit 2 is connected to the power supply voltage VDD, and performs signal attenuation on the differential input current to generate a current attenuation signal;

[0119] Step S3. The bias current source 3 is connected to the power supply voltage VDD, and is conducted to output a bias current to the first current mirror 4 and the second current mirror 5 according to the current attenuation signal;

[0120] Step S4. Both the first current mirror 4 and the second current mirror 5 copy the bias current, respectively generate a copy current and transmit it to the third current mirror 6;

[0121] Step S5. The third current mirror 6 increases the unity gain bandwidth, amplifies the gain of ...

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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...

Claims

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Application Information

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IPC IPC(8): H03F1/32H03F3/45
CPCH03F1/3211H03F3/45179H03F2203/45054
Inventor 宋树祥林思远岑明灿
Owner GUANGXI NORMAL UNIV
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