Method and apparatus for a level-shift inverter for cathode ray tube blanking
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United States of America Patent
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Oct 7, 2008
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N/A
app pub date -
Sep 28, 2004
filing date -
Sep 28, 2004
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Abstract
A level-shifting inverting circuit provides a blanking signal to Grid 1 of a CRT. The circuit provides the blanking signal from a blanking logic signal according to a voltage transfer characteristic that is substantially similar to the voltage transfer characteristic of a standard CMOS inverter. Also, the level-shifting inverting circuit includes a switch circuit that includes a differential pair. The differential pair has the blanking logic signal at one input, and a bias signal at the other input. The switch circuit is coupled to a voltage divider that provides an output voltage that is pre-determined by a resistor ratio when the switch circuit is open. If the blanking logic signal is low, the switch circuit is open. Conversely, if the blanking logic signal is high, the switch circuit is closed, and sinks current from the voltage divider, causing the output voltage to correspond to a second pre-determined voltage level.
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