Multi-phase filter/DAC
US5521946A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 7, 1994 |
| Grant date | May 28, 1996 |
| Priority date | — |
| Expiry date | Jan 7, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H17/0657
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Apparatus and method for use with a sampled input signal having an input sampling frequency F.sub.S. The apparatus including M digital filters, each receiving the input signal, each having a respective transfer characteristic h.sub.m [n] and each producing a respective output signal updated at the input sample rate F.sub.S, each m'th one of the filters updating its output signal in response to a respective m'th phase of the input sample clock, M.gtoreq.2. The apparatus then combines the output signals of the digital filters to produce a combined output signal having a sample rate of at least MF.sub.S. The apparatus may also be viewed as a hybrid digital/analog filter. The method includes steps of receiving the sampled input signal, filtering the sampled input signal through P filters, combining the outputs of the P filters to produce M output signals, 1<M.ltoreq.P, each m'th one of the M output signals being updated in time for respective m'th one of the phase of the input sampling frequency F.sub.S, and combining the M output signals to produce a combined output signal having a sample rate of at least MF.sub.S.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.