Direct conversion circuit for radio frequency signals
US6243569A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 12, 1998 |
| Grant date | Jun 5, 2001 |
| Priority date | — |
| Expiry date | Aug 12, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D3/007
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A direct conversion circuit for radio frequency signals is disclosed. The circuit includes a pair of quadrature related mixers, a phase shift unit, and a local oscillator. The pair of quadrature related mixers is coupled to a radio frequency signal input port for mixing down a radio frequency input signal. The phase shift unit is in communication with at least one of the pair of mixers for phase shifting a local oscillator signal. The local oscillator produces the local oscillator signal. The local oscillator includes a non-integer frequency multiplier for multiplying the frequency of a first voltage controlled oscillator signal by a non-integer value to produce the local oscillator signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.