Gm-C time constant tuning circuit
US7239197B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 2005 |
| Grant date | Jul 3, 2007 |
| Priority date | — |
| Expiry date | Nov 30, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D13/004
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A circuit including a Gm-C filter and an automatic Gm-C time constant tuning circuit is provided. The tuning circuit includes a reference conductor, a reference capacitor coupled to the reference conductor, a comparator generating signals according to a reference signal and the voltage signal at the output of the reference conductor, a feedback capacitor, and a charge pump charging and discharging a feedback capacitor according to the output of the comparator. The feedback capacitor provides a control voltage feedback to the tuning circuit and to the Gm-C filter for adjusting the conductance. Hence, in doing so, errors like manufacturing variation and offset can be prevented.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.