连续可变分数率抽取电路 Application Note: Virtex-5, Virtex-4, Spartan-3 R Continuously Variable Fractional Rate Decimator XAPP936 (v1.1) March 5, 2007 Author: Sean Caffee Summary This application note focuses on the baseband demodulation of Quadrature Amplitude Modulation (QAM) signals and, more specifically, on the use of a fractional rate decimator block. This application note also reviews polyphase decimating fi……