Design of front-end circuits for ultrasonic sensor using FPGA
LI Zhi-gan · Electronic Design Engineering · 2013
Ultrasonic Sensors is widely used in the measurement of wind speed and direction,and the system performance is directly related to the design of front-end circuits. In order to achieve steady driving effect, drive circuit uses a low voltage drive mode. In order to insure the ultrasonic singal that received are stable and accurate, we design the receiving circuit and signal processing circuit,then conducting the anti-interference limit processing, preamplifier, band-pass filter, automatic gain control amplifier and voltage comparison. The ultrasonic alternating voltage signal that received are converted into the digital singal that FPGA can use directly. The experimental results have indicated that the design of each circuit module can meet the demand of system.