Telecommunications – Wireless distribution system
Patent
1997-06-18
2000-07-18
Harvey, David E.
Telecommunications
Wireless distribution system
348726, 348731, H04N 720
Patent
active
060919310
ABSTRACT:
An improved DBS receiver front end architecture having a tuner chip and a demodulator/decoder chip. The tuner chip and the demodulator/decoder chip each include portions of a digital tuning frequency synthesizer. The frequency synthesizer comprises one or more digital counters which are implemented on the demodulator/decoder chip, and an oscillator which is implemented on the tuner chip. This advantageously avoids digital noise interference with the tuner chip while providing a reduced part count. Briefly, the present invention concerns a DBS receiver front end which includes a tuner chip and a demodulator/decoder chip which cooperate to perform a frequency synthesis function. The tuner chip has a tuning oscillator coupled to a tank circuit having an adjustable resonance frequency, and a downconverter coupled to receive a tuning frequency signal provided by the tuning oscillator. The demodulator/decoder chip has a programmable counter configured to count cycles of the tuning frequency to provide a frequency-divided signal to a phase detector. The phase detector compares the frequency-divided signal to a reference frequency, and is coupled to adjust the resonance frequency of the tank circuit to cause the tuning frequency to have a frequency which is a multiple of the resonance frequency. The demodulator/decoder chip also has a decoder which receives the baseband signal and converts it to a decoded signal.
REFERENCES:
patent: 5715528 (1998-02-01), Kuo et al.
patent: 5819157 (1998-10-01), Ben-Efraim et al.
patent: 5901184 (1999-05-01), Ben-Efraim
Ben-Efraim Nadav
Keate Christopher
Harvey David E.
LSI Logic Corporation
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