A programmable transversal filter for voice-frequency applications
- 1 August 1981
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Journal of Solid-State Circuits
- Vol. 16 (4), 367-372
- https://doi.org/10.1109/JSSC.1981.1051602
Abstract
A fully integrated, programmable transversal filter optimized for low-noise, low-power, voice-frequency applications is described. The filter, fabricated with a standard double-poly NMOS process, achieves convolution of an analog input signal with digital tap weightings using a structure with sample-and-hold gates for analog storage and a multiplexed MDAC for multiplication. The design of the filter eliminates fixed pattern noise usually associated with such structures and enables a dynamic range in excess of 70 dB (LPF, f/SUB o//f/SUB s/=0.08) to be achieved at an 8 kHz sampling rate with a power dissipation of less than 80 mW. This area efficient device forms the basis for a range of possible voice-band signal processing functions.Keywords
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