Dynamic vertical height control circuit
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United States of America Patent
Stats
-
Jul 31, 1990
Grant Date -
N/A
app pub date -
Aug 8, 1988
filing date -
Aug 8, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention provides a novel dynamic vertical height control circuit for a CRT display which is adapted to receive an input signal over a broad range of variable frequencies. The dynamic variable input frequency is applied to a free running oscillator which is coupled to a ramp generator for producing a ramp output signal. The ramp output signal is coupled back through novel feedback means comprising a comparator and means for determining the magnitude of the ramp output signal voltage for producing a feedback signal which is applied as a control signal to the ramp generator. The feedback control maintains a vertical height control signal which maintains a constant vertical display size on the CRT display.
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