High performance switched-capacitor filter for oversampling sigma-delta digital to analog converters
US6268815A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 3, 2000 |
| Grant date | Jul 31, 2001 |
| Priority date | — |
| Expiry date | Mar 3, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H19/004
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An improved SC filter for OSDACs for asynchronous digital subscriber line (ADSL) applications. More specifically, an improved switched-capacitance (SC) filter for an over-sampled digital to analog converter intended for use in a multi-mode analog front end for a host of ADSL applications. The SC filter is configured for low power consumption and for a low-ambient noise floor across the frequencies of interest. The SC filter is further configured to drive a resistive load of a few kohms and for low signal distortion. The SC filter lowers power consumption by decimating the input waveform and reducing the number of operational amplifiers in the circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.