Integrated low power channel select filter having high dynamic range and bandwidth
US7051063B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 3, 2002 |
| Grant date | May 23, 2006 |
| Priority date | — |
| Expiry date | Mar 5, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2210/036
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A channel select filter circuit is disclosed using a current-mode transconductance-capacitor (gm-C) architecture, which is tuned by digitally controlled capacitor arrays. The main filter includes at least one transconductor-capacitor (gm-C) filter and a transresistance amplifier. A replica transconductor-capacitor (gm-C) filter and a phase detector are used to establish any phase shift in an input signal, and a state machine adjusts capacitor arrays in the the replica transconductor-capacitor (gm-C) filter and the at least one transconductor-capacitor (gm-C) filter in order to set a cut-off frequency of the channel select filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.