Drive circuit with rise and fall time equalization

Details Drive circuit with rise and fall time equalization Drive circuit with rise and fall time equalization

1995-06-07

1997-07-22

Powell, Mark R.

Computer graphics processing and selective visual display system

Display driving control circuitry

Waveform generator coupled to display elements

G09G 300

Patent

active

056508018

ABSTRACT:
A drive circuit in which the rise and fall characteristics with multiple voltages are made the same, while maintaining a high breakdown voltage. Drive circuit 70, which supplies power supply voltages VH and VL and voltage VM intermediate between them to output pad 32, is composed of p-channel MOS transistor P5 and n-channel MOS transistors N5, N6 and N7. When the output voltage changes from VH to VM, both transistors N6 and N7 conduct, and when the output voltage changes from VL to VM, only transistor N6 conducts. The transistors that supply intermediate voltage VM are constructed of transistors of the same conductivity type, so that the rise and fall characteristics to VM can be made the same while the breakdown voltage of the transistors in the circuit that supplies this intermediate voltage VM is kept high.

REFERENCES:
patent: 4917467 (1990-04-01), Chen et al.
patent: 5113097 (1992-05-01), Lee

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