Tuner station selecting apparatus
US5179729A · kind A · utility
25Cited by
6References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 20, 1990 |
| Grant date | Jan 12, 1993 |
| Priority date | — |
| Expiry date | Feb 20, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B21/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A tuner station apparatus includes a first mixer for combining an input signal and a first local oscillation signal, and a second mixer for combining an output of the first mixer and a second local oscillation signal. The first and second local oscillation signals are generated by first and second PLL circuits, respectively. Each of the first and second PLL circuits include a frequency divider, a variable frequency divider, a phase comparator, a low pass filter, and a voltage controlled oscillator. The frequency divider of the first PLL circuit has a higher frequency division ratio than that of the second PLL circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.