Use of oversampled Sigma - Delta modulator for analogue adaptive FIR filters based on LMS algorithm

An adaptive FIR filter configuration which uses a Sigma - Delta modulator as a front end is proposed for implementing the LMS algorithm in analogue form. The oversampled Sigma - Delta modulator converts the filter input into a binary sequence, which can be readily delayed and multiplied with a shift register and on/off switching. Computer simulations show very good performance for such a hardware efficient configuration. >