Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1996-01-30
1997-04-01
Tran, Toan
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327538, 327427, G05F 110
Patent
active
056170572
ABSTRACT:
A bi-directional control circuit for preventing the improper functioning of a pass transistor MN1 in a CMOS circuit due to abnormally high voltages on its source and drain nodes IO1 and IO2, involves controlling the voltage V1 on gate of MN1 using a gate node N1 that is coupled to supply voltage VCC under the control of two transistor pairs MN3, MN4 and MP3, MP4 that sense the voltages on IO1 and IO2, and an inverter pair MP2, MN2 having a voltage signal ENB input on its gates. If the voltages on nodes IO1 and IO2 both go high, MP3 and MP4 tend to turn OFF dropping gate voltage V1, via MP2, below VCC and tending to turn MN1 OFF. Leakage from node N1 in such event occurs through a small current bleed network formed by three transistors MN6, MN7, and MN8.
REFERENCES:
patent: 3657572 (1972-04-01), Millman
patent: 4066917 (1978-01-01), Compton et al.
patent: 4614882 (1986-09-01), Parker et al.
Rees David B.
Steadman Martin J.
Cypress Semiconductor, Inc.
Tran Toan
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