Complex band-pass ΔΣ AD modulator for use in AD converter circuit
US7098828B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 22, 2005 |
| Grant date | Aug 29, 2006 |
| Priority date | — |
| Expiry date | Jun 22, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/464
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A complex band-pass ΔΣ AD modulator is provided with a subtracter device, a complex band-pass filter, first and second AD converters, and first and second DA converters. The first and second DA converters and first and second logic circuits are sandwiched by first and second multiplexers. At a first timing of a clock signal, the first multiplexer inputs and outputs the first and second digital signals as they are, and at a second timing thereof, the first multiplexer inputs the first and second digital signals, and outputs the first digital signal as a second digital signal and outputs the second digital signal as a first digital signal. The second multiplexer inputs and outputs first and second analog signals similarly. The first and second logic circuits substantially noise-shapes non-linearities of the first and second DA converters by realizing complex digital and analog filters, using high-pass and low-pass element rotation methods.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.