Design of Accelerometer Signal Acquisition Circuit Based on V/F Converter AD7742
Zou Jiang · Electronics Optics & Control · 2013
Strap-down Inertial Navigation System(SINS) accelerometer output signal requires highprecision acquisition, and the V / F converter circuit has some advantages in accelerometer signal acquisition.A brief introduction is given to the use of the EDK of FPGA in kernel design.Since the output of accelerometer is analog current signal, using ADC for acquisition and conversion is susceptible to temperature drift and reference voltage fluctuations.The I / F circuit acquisition technology has high accuracy, but is difficult to control.On this occasion, using V / F circuit for acquisition of the accelerometers has a great advantage.This paper describes the V / F circuit hardware design process, including the use of the V / F converter AD7742, and the precise instrument amplifier INA118.FPGA is used to verify signal acquisition process.Experiment proved the correctness of the design.