Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1994-01-18
1996-04-23
Nelms, David C.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327535, 327537, 327538, 327566, 327333, 327108, 345204, 345211, 345212, H01J 1982, H01L 2500, H03L 500, G09G 500
Patent
active
055107486
ABSTRACT:
An integrated circuit for driving an active or passive matrix liquid crystal display panel or the like provides an analog output signal which switches through a voltage range that exceeds the safe operating voltage of the CMOS transistors from which it is formed. Duplicate digital to analog conversion circuits are provided on the integrated circuit but are operated from two different power supply voltage ranges. Each voltage range has a magnitude less than the safe operating voltage. The analog output signals generated by the duplicate digital to analog conversion circuits are coupled to an output multiplexer that is responsive to a control signal for selecting one of the two analog output signals to the output terminal of the integrated circuit. The output multiplexer includes an n-channel pass transistor and a p-channel pass transistor coupled to the output terminal in parallel with each other and responsive to the control signal for passing one or the other of the dual analog signals to the output terminal. Exposure of the pass transistors to voltages exceeding the safe operating voltage is avoided by inserting shielding transistors in series therewith.
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Ciccone Thomas W.
Erhart Richard A.
Nelms David C.
Phan Trong
Vivid Semiconductor, Inc.
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