Research And Design Of Low Voltage And Power Consumption Amplifier In MEMS Geophones

Geophysical instruments carry seismic data acquisition,data processing,and data interpretation in mineral exploration.Seismic data collection is the most critical and fundamental part.Therefore,as a seismic detector for seismic data acquisition,its performance indicators have become a constant concern.MEMS wireless geophones have become commonly used geophones due to their distributed wireless exploration,high-precision data acquisition and small size.However,when seismic exploration is carried out in the field,the most important requirement for the instrument is its stability and maximum working time.Therefore,reducing the power consumption of MEMS geophones and increasing the stability of work are the key issues.In analog integrated circuits,amplifiers are the basic building blocks and play a vital role in many analog integrated circuit systems.It can be seen that the low-power design of the instrument is largely the low-voltage and low-power design of the corresponding amplifier.The amplifier voltage and power consumption are reduced to ensure that the instrument can maintain longer working time under the same power supply.It brings great advantages to field construction.Therefore,this paper designs three low-voltage,low-power operational transconductance amplifiers for use in MEMS geophones.The design idea of this paper is to use the substrate driving technology in CMOS technology to achieve low voltage,and use the sub-threshold technology to realize the low current power supply of the circuit,so as to achieve the low power consumption of the op amp.While using substrate-driven technology and sub-threshold technology,some innovative circuit technologies have been proposed for the problem of insufficient transconductance and insufficient bandwidth for such op amps,including: proposed low-voltage low-power type I op amp with auxiliary amplifier and positive The feedback technology realizes the effect of reducing the transconductance of the substrate driving circuit with the CMOS process,and the boost of the transconductance is adjustable;the designed low-voltage and low-power transconductance lifting type II op amp changes the tradition.The input stage of the substrate driver circuit proposes a new input stage circuit structure,which improves the effective transconductance of the circuit.The designed low-voltage and lowpower transconductance-lift type III op amp is used reasonably and effectively from a new perspective.The "back gate effect" of the MOS transistor substrate simultaneously couples the input signal to the gate and substrate terminals of the input MOS,effectively improving the transconductance of the circuit,and the circuit structure is very stable.Through the Cadence simulation software,the simulation and layout design of the three types of low-voltage and low-power op amps were designed.Finally,a lowvoltage and low-power op amp chip suitable for MEMS geophones was successfully developed.The measured results show that the design results The amplifier performance meets the requirements.