Quadrature bandpass ΔΣ converter
US7262726B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 2006 |
| Grant date | Aug 28, 2007 |
| Priority date | — |
| Expiry date | Jun 1, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/454
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An improved quadrature bandpass ΔΣ converter includes a loop filter, an ADC responsive to the loop filter, and a first feedback DAC responsive to the ADC; a first summing circuit is responsive to the first DAC and an analog input for providing an input to the loop filter; a second feedback DAC is responsive to the ADC for providing an input to the loop filter; the loop filter includes a plurality of signal resonators, at least one image resonator, a second summing circuit, and a feed forward circuit connecting at least two of the resonators to the second summing circuit for reducing the quantization noise from the ADC; the image resonator is responsive to the second DAC for reducing the image quantization noise.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.