Bandpass filter with carrier frequency reduction
US7555273B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 11, 2006 |
| Grant date | Jun 30, 2009 |
| Priority date | — |
| Expiry date | Apr 16, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D7/166
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A bandpass filtering method in which two frequency transpositions are performed in parallel on an input signal (SE) for filtering using respective first and second upstream mixing signals (SM1, SM2). A common oscillator (LO) is used which is coupled with a first phase shifter (MTM) to produce upstream mixing signals and which is coupled with a second phase shifter (MTV) to produce downstream mixing signals. Phase shifters are used in opposite manner on first and second signals so that each of said first and second signals (VT1, VT2) receives the phase-advanced output signal from one of the two phase shifters and the phase-delayed output signal from the other of the two phase shifters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.