Interference-free broadband television tuner
US5847612A · kind A · utility
99Cited by
3References
34Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 1, 1997 |
| Grant date | Dec 8, 1998 |
| Priority date | — |
| Expiry date | Aug 1, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2215/064
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An interference free local oscillator circuit is disclosed. A first local oscillator signal is generated in a first phase locked loop. A second local oscillator signal is generated in a second phase locked loop. Third and fourth phase locked loops provide inputs to the second phase locked loop to control the second local oscillator frequency. The operating frequencies of the first and second local oscillator signals are selected so that spurious signals generated in the phase locked loops do not interfere with a received RF signal in a conversion circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.