Pulse or digital communications – Receivers – Automatic frequency control
Patent
1997-06-18
1999-05-04
Chin, Stephen
Pulse or digital communications
Receivers
Automatic frequency control
375345, 375371, 375374, 455 32, 348731, 348733, H04L 2706, H04H 100
Patent
active
059011840
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 frequency signal when the doubler is disabled. The tuner chip also has a tuning oscillator which provides the input frequency, and a downconverter coupled to receive the tuning frequency signal. The downconverter further receives a receive signal and responsively provides a product signal which is then converted to a baseband signal. The demodulator/decoder chip is configured to control the input frequency to the doubler, and further configured to convert the baseband signal to a decoded signal.
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patent: 5819157 (1998-10-01), Ben-Efraim et al.
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Ben-Efraim Nadav
Keate Christopher
Chin Stephen
Kivlin B. Noel
LSI Logic Corporation
Maddox Michael W.
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