Sub-threshold bulk-driven operational transconductance amplifier based on chopper stabilization technology

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.