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A Continuous-Time Programmable Digital FIR Filter

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3 Author(s)
Yee William Li ; Dept. of Electr. Eng., Columbia Univ., New York, NY ; Shepard, Kenneth L. ; Tsividis, Y.

In this paper, we describe the design and implementation of a continuous-time finite-impulse-response processor chain, which includes a 6-bit asynchronous ADC, an asynchronous digital core, and an 8-bit asynchronous DAC designed in TSMC 0.25-mum technology. The continuous-time, discrete-amplitude systems combine benefits associated with analog and digital systems. Discrete-amplitude representations leverage the noise immunity and robustness of digital implementations. Continuous-time, nonsampled operation prevents aliasing and reduces the in-band quantization noise associated with the aliasing of subharmonic components. We present measurement results demonstrating an audio low-pass filter with a bandwidth of 6.0 kHz

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:41 ,  Issue: 11 )