Extended range voltage controlled oscillator for frequency synthesis in a satellite receiver
US5901184A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 18, 1997 |
| Grant date | May 4, 1999 |
| Priority date | — |
| Expiry date | Jun 18, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2027/0069
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An improved DBS receiver front end architecture having a voltage controlled oscillator for frequency synthesis. The voltage controlled oscillator includes a tank circuit having an adjustable resonance frequency which may be varied over an octave. A tuning oscillator drives the tank circuit and provides a signal having that resonance frequency to a range extender which provides a tuning frequency. When enabled, the range extender doubles the input frequency, and when disabled, simply passes the input frequency through. A feedback path provides a control voltage to the tank circuit to adjust the resonance frequency and thereby cause the tuning frequency to be a multiple of a reference frequency. The range extender extends the tuning frequency range over two octaves without a loss of frequency resolution. Broadly speaking, the present invention contemplates a DBS receiver front end which includes a tuner chip and a demodulator/decoder chip. The tuner chip has a frequency doubler which provides a tuning frequency signal having a frequency twice that of an input frequency signal when the doubler is enabled, and a tuning frequency signal having a frequency equal that of an input frequenc…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.