A digital FM demodulator for FM, TV, and wireless

被引:14
作者
Song, BS
Lee, IS
机构
[1] Department of Electrical and Computer Engineering, Coordinated Science Laboratory, University of Illinois at Urbana Champaign, Urbana
关键词
D O I
10.1109/82.476180
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
An FM demodulator is implemented digitally in software using a quadri-correlator algorithm so that the FM function can be made compatible with future digital wireless and FM receiver systems. The proposed digital FM demodulator uses a sinc(3) decimation filter with its first zero either on the alternate channels or on the adjacent channels for high channel selectivity, a digital differentiator using a three-point approximation for frequency discrimination, and a digital division for AM rejection. A bitstream FM signal from a fourth-order bandpass delta-sigma modulator is FM-demodulated to exhibit a SNDR of 71 dB, a THD of 0.01%, and an AM rejection of 77 dB in simulations using a signal bandlimited to 1/200 of the sampling frequency and amplitude-modulated with a modulation index of 0.9 (90% AM).
引用
收藏
页码:821 / 825
页数:5
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