Wideband frequency synthesizer for direct conversion transceiver
US5894592A · kind A · utility
45Cited by
5References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 17, 1997 |
| Grant date | Apr 13, 1999 |
| Priority date | — |
| Expiry date | Apr 17, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/40
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A wideband phase-lock loop frequency synthesizer (200) used in a radio transceiver capable of being reconfigured to operate in either a transmit, receive, or battery save mode. The wideband phase-lock loop frequency synthesizer (200) includes, a divide-by-two divider (205), quadrature detector (204), offset VCO (209) and offset mixer (207) for generating a quadrature phase modulated signal. Moreover, a programmable filter (211) is used for removing predetermined harmonic components of the offset mixed signal enabling the synthesizer to operate over a wide frequency range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.