High-speed programmable analog transversal filter having a large

Details High-speed programmable analog transversal filter having a large High-speed programmable analog transversal filter having a large

1993-06-14

1994-06-28

Mai, Tan V.

Boots, shoes, and leggings

364861, G06G 702, G06G 700

Patent

active

053253221

ABSTRACT:
A programmable analog transversal filter suitable for monolithic Bipolar-Complimentary-Metal-Oxide Semiconductor (BiCMOS) realization. The tap weights are digitally programmable by capacitor-switching responsive to binary input signals. Speed is improved by combining the multiplication and summation functions into a single capacitor array without operational amplifiers. A continuous analog input signal is filtered to produce a discrete time analog output signal, which may be made continuous by adding a low-pass filter. The capacitor array performs both multiplication and summation functions simultaneously and automatically normalizes the resulting output signal. Because no operational amplifiers are used in the multiplication/summation functions, they are not limited by operational amplifier dynamic range and slew-rate.

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"Finite-Impulse-Response Filters", Electronics Engineer's Handbook, McGraw-Hill Book Company, New York, NY, Chapter 8, pp. 78-81.
"A Switched-Capacitor Realization of Multiple FIR Filters on a Single Chip", Lee et al., IEEE Journal of Solids-State Circuits, vol. 23, No. 2, pp. 536-542, Apr. 1988.

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