Design of a Data Collection Card with High Performance and Low Noise

In view of problems of low precision, low sampling rate and low data transmission rate existed in current data collection products based on USB interface in China, a data collection card with high performance and low noise was designed. The card uses high-speed differential amplifier AD8132 to make preamplifier; uses CPLD and SRAM to compose large capacity FIFO; uses USB2.0 bus technology to transmit data; uses independent clock to provide accurate synchronous clock signal for CPLD and AD converter to reduce clock phase noise; uses VC++ to design application program of upper computer to realize data analysis and processing. The test result showed that the card has advantages of low noise, rapid transmission rate and high precision.