High-speed Gm-C tuning
US7019586B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 23, 2004 |
| Grant date | Mar 28, 2006 |
| Priority date | — |
| Expiry date | Mar 23, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J2200/28
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A technique to achieve high-speed tuning of a Gm-C circuit, such as, for example, a Gm-C filter. In one embodiment, a master Gm-C time-constant circuit incorporates at least one element (either a transconductance or a capacitance) that is matched to a corresponding element (transconductance or capacitance) in the (slave) Gm-C circuit. A waveform generated by the master Gm-C time-constant circuit is used to control a sampler. In one embodiment, the sampler samples a precision counter so as to result in a sampler output having a polarity that steers the tuning voltage in the necessary direction. A tuning control stage coupled to the sampler output implements an algorithm that causes the tuning voltage to converge, with a predetermined precision, to the desired tuning voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.