It provided not only some control signals that measure circuit need but also counters used for analog digital conversion . the calculation of data is accomplished by means of the application software
2.
Secondly , basing on single channel if sr receiver mathematic model , this thesis has designed if sr receiver subsystem and brought forward its design project and system circuit principle diagram , and explained the system working principle . furthermore , this thesis introduces the working principles and respective applications of wideband high - speed adc ad6640 , ddc ad6620 and high - speed dsp tms320c6713 according with the if sr receiver subsystem high - speed analog digital conversion department , digital down conversion department and high speed digital signal processing department . thirdly , the thesis emphatically demonstrates the software realization department of the if sr receiver subsystem , which including ad6620 ' s inner parameter software setup , tms320c6713 data transmission and processing and the quadrant demodulation algorithm program realization
3.
The thesis includes the design of hard circuit , pcb ( printed circuit board ) , driver and application soft involving a / d board and d / a board . the detailed functional modules consist of multiplex signals select module �� analog digital conversion module �� digital analog conversion module �� pci protocol conversion module �� driver and magnifying module �� control logic �� clock circuit and configuration circuit . the importance of the thesis is a / d board
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