A continuous-time programmable digital FIR filter

We describe the design and implementation of a continuous-time finite-impulse-response processor chain, which includes a six-bit asynchronous ADC, an asynchronous digital core and an eight-bit asynchronous DAC designed in TSMC 0.25 /spl mu/m technology. Continuous-time operation avoids aliasing and the quantization noise associated with the aliasing of harmonic components. We present measurement results demonstrating an audio low-pass-filter with a bandwidth of 6.0 kHz implemented with this processor.