Design of general-purpose acquisition-control module for well-logging signal based on DSP and FPGA

The signal-acquisition-control-modules of existing well-logging tools have poor universality, low integration and poor stability. A general-purpose signal-acquisition-control module for versatile well-logging tool is designed which is based on SM320F28335 DSP chip and A3P250 FPGA chip. The composition of the hardware circuit is given. The acquisition on analog signals, pulse signals, as well as waves can be completed by this module, which can control both relay and analog switch. The module can provide versatile bus interfaces. On different well-logging tools, no change is needed for the hardware circuit, what's only needed is to download the corresponding procedure. Tests show that this module works stably and has high performance and low failure rate, which shows that it is suitable for the mal-condition of high temperature and pressure underground.