Complex band-pass filter for use in digital radio receiver and complex band-pass Δ-Σ AD modulator using the same
US7227482B2 · kind B2 · utility
9Cited by
15References
20Claims
0Family size
Assignee
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Key dates
| Filing date | Apr 24, 2006 |
| Grant date | Jun 5, 2007 |
| Priority date | — |
| Expiry date | Apr 24, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/454
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In a first-order complex band-pass filter, multiplexers are alternately switched over between time intervals of phases A and B, where the multiplexers includes two multiplexers provided at input and output stages, and a multiplexer provided in a feedback circuit of each of first-order filters and being switching over whether to invert a sign of a feedback signal. Then in a circuit part sandwiched between the multiplexers, a processing performed by an I circuit part and a processing performed by a Q circuit part are alternately switched over so that a sign of a signal inputted to an adder is inverted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.