Tuning circuit for use with an integrated continuous time analog filter
US5245646A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1992 |
| Grant date | Sep 14, 1993 |
| Priority date | — |
| Expiry date | Jun 1, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H11/1291
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A tuning circuit (10) and method of operation for tuning an analog filter (40). The tuning circuit (10) has an integrator with an input portion (12) and a comparator portion (14), a counter (32), and a decoder (34). The integrator is implemented with an RC time constant which is proportional to an RC time constant of the analog filter (40). The comparator portion (14) provides an enable signal during the RC time constant of the integrator to the counter (16) which quantizes the RC time constant relative to a clock period of the counter (16). A predetermined decoding is performed to provide an output control signal to control adjustment of the RC time constant of the analog filter (40).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.