Sawtooth generator controlled in a gain control feedback loop
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United States of America Patent
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-
Sep 30, 1997
Issued Date -
N/A
app pub date -
Aug 29, 1996
filing date -
Mar 2, 1992
priority date (Note) -
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status (Latency Note)
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Abstract
In a vertical sawtooth generator of a vertical deflection circuit, a first comparator generates an output signal when a retrace portion of a sawtooth signal is at a first magnitude to initiate a vertical trace portion of the sawtooth signal. An amplifier responsive to the sawtooth signal generates a feedback current at a time that occurs between the center of vertical trace and the end of trace and away from each of the center and end of trace. The feedback current is coupled to a first capacitor to develop a control voltage. The control voltage is applied via a voltage-to-current converter to an integrating capacitor to develop in the integrating capacitor the trace portion of the sawtooth signal. The control voltage is initialized during a power start-up interval.
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