An adaptive FIR filter configuration which uses a ∑-∆ modulator as a front end is proposed for implementing the LMS algorithm in analogue form. The oversampled ∑-∆ 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.
- Adaptive filters
- Switched capacitor filters