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

来源：

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS | 1995年 / 42卷 / 12期

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

页码：821 / 825

页数：5

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