Abstract
An acquisition system applying in transient electromagnetic method (TEM) receiver has been designed in this paper. The accuracy of acquisition has been improved by using a floating-point A/D with high input dynamic range, which is composed of programmable gain amplifiers (PGA) and a dual-channel 16 bit resolution ADC. The real-time performance can be ensured by using a field-programmable gate arrays (FPGA) as the main control unit to control ADC, PGA, data storage and communication interface. By integrating a soft core CPU, Nios II, in FPGA, the complexity of circuit design was decreased, and the work efficiency of system was improved. This system, which has good performance of real-time and high integration level, can meet the needs of TEM signal acquisition.
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