Satellite receiver tuner chip with frequency synthesizer having an externally configurable charge pump
US5999793A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 18, 1997 |
| Grant date | Dec 7, 1999 |
| Priority date | — |
| Expiry date | Jun 18, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2027/0057
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The problems outlined above are in large part solved by an improved DBS receiver front end architecture having a tuner chip and a demodulator/decoder chip. The front end includes a frequency synthesizer with an externally configurable charge pump on the tuner chip. The charge pump is coupled to a tank circuit having an adjustable resonance frequency. The resonance frequency can be adjusted over an entire octave by controlling the reverse bias voltage on a pair of varactors. A charge pump with a configurable gain is used to provide a control voltage to the tank circuit to provide a constant phase locked loop response over the frequency range of the tank circuit. Broadly speaking, the present invention concerns a DBS receiver front end which includes a tuner chip and a demodulator/decoder chip. The tuner chip is coupled to receive a receive signal and convert it to a baseband signal. The tuner chip includes an externally configurable charge pump, a tuning oscillator, and a downconverter. The charge pump receives binary inputs indicating a desired gain and responsively amplifies a phase difference signal by the desired gain to provide a correction signal to a loop filter. The loop fil…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.