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Design of ΣΔmodulator based on FPGA data expansion
Author(s): 
Pages: 24-29,42
Year: Issue:  6
Journal: Applied Science and Technology

Keyword:  ΣΔ modulationdata expansionoversamplingnoise shapingLC passive filter;
Abstract: In view of the problem that ΣΔ modulator implemented in analog circuits is limited by the amplitude of input signals, this paper designed a second?order ΣΔ modulator based on a Field Programmable Gate Array ( FP?GA) data expansion method. The modulator can accurately modulate full?scale signals; in addition, for the wave?form output, a simple passive filter can be used to realize the filtering of quantizing noise and the demodulation of signal. Compared with the simulated circuit, the FPGA can realize the effective expansion via the data bits of inner memory, prevent the wrong modulation caused by the overflow of the intermediate process data, so as to guarantee the stability of circuit. The corresponding conclusions are verified by simulation and hardware implementation.
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