Analog adaptive FIR filter having independent coefficient sets for each filter tap
US7188135B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 16, 2004 |
| Grant date | Mar 6, 2007 |
| Priority date | — |
| Expiry date | Sep 3, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H15/023
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A finite impulse response filter having tap weight rotation is provided, where each tap has a corresponding coefficient selector. Each coefficient selector includes N coefficients, where N is the number of taps. Each coefficient selector provides one of its corresponding coefficients as an input to a multiplier. Each multiplier also receives an input from a triggered track and hold tap. The tap coefficients are selected according to the time delay since the corresponding track and hold tap was most recently triggered. In this manner, the tendency of multiplier gain nonuniformity to degrade filter operation in the presence of tap weight rotation is reduced. In another embodiment, an offset selector is provided, to reduce the tendency of component offsets to degrade filter operation in the presence of tap weight rotation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.