Oscillator frequency control arrangement for a stereo decoder
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United States of America Patent
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-
Mar 28, 1989
Grant Date -
N/A
app pub date -
Aug 31, 1987
filing date -
Aug 31, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A charge pump arrangement receives a digital error word representing an error signal and charges or discharges a capacitor in accordance with the sign of the error word by an amount that is proportional to the absolute value of the error word. The voltage produced in the capacitor is coupled to a frequency control terminal of a voltage controlled crystal oscillator that is used in, for example, a stereo decoder.
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