High-speed programmable analog transversal filter having a large dynamic range
US5325322A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 14, 1993 |
| Grant date | Jun 28, 1994 |
| Priority date | — |
| Expiry date | Jun 14, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H15/00
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.