Subthreshold substrate-driven operational transconductance amplifier based on chopper-stabilized technique

Abstract

The invention provides a sub-threshold bulk-driven operational transconductance amplifier based on a chopper stabilization technology. The sub-threshold bulk-driven operational transconductance amplifier comprises a bulk-driven operational transconductance amplifier, a first chopper switch and a second chopper switch; the bulk-driven operational transconductance amplifier comprises a PMOS bulk-driven input differential pair, an output impendence stage composed of a folded cascade, and a current source composed of MOS transistors; all the MOS transistors work in a sub-threshold region; nanowatt power consumption under ultra-low power supply voltage is realized; the PMOS bulk-driven input differential pair has the rail-to-rail input capability in a low voltage condition; a function of converting an input voltage signal into a current signal is realized; the output impendence stage provides high output impendence for the amplifier; and simultaneously, the current signal is converted into the voltage signal. By means of the sub-threshold bulk-driven operational transconductance amplifier based on the chopper stabilization technology disclosed by the invention, 1 / f noise and maladjustment in the sub-threshold bulk-driven operational transconductance amplifier can be reduced through the first and second chopper switches; therefore, the better noise performance can be obtained; and thus, the sub-threshold bulk-driven operational transconductance amplifier has wide application prospect.

Description

technical field [0001] The invention relates to the technical field of analog integrated circuit design, in particular to a sub-threshold substrate-driven operational transconductance amplifier based on chopper stabilization technology. Background technique [0002] In recent years, the rapid development of medical electronic technology and the rise of the Internet of Things have greatly promoted the development of sensors and their interface circuits. In the field of medical electronics, such as biological implanted chips, it is usually required to operate normally and stably for several years or even decades, so the power consumption of the chip sensor interface circuit is the key to the design. This requires the sensor interface circuit to work properly in a very low voltage environment and consume very low power consumption. However, with the rapid development of deep submicron semiconductor technology, the design of low-voltage analog circuits has encountered difficult...

AI Technical Summary

Problems solved by technology

[0006] 1. The 1 / f noise is too large. Generally, the inflection point of 1 / f noise is around 1kHz, and the noise floor at tens of Hz can reach several μV / sqrt(Hz), which greatly reduces the signal-to-noise ratio of the circuit.

[0007] 2. Large offset voltage affects circuit accuracy

[0008] 3. High 1 / f noise leads to noise optimization, while the power consumption of the amplifier will increase

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