Fault protection using parallel output CMOS devices for integrat

Details Fault protection using parallel output CMOS devices for integrat Fault protection using parallel output CMOS devices for integrat

1995-12-29

1997-09-09

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Parallel controlled paths

327427, 327379, H03K 1762

Patent

active

056660820

ABSTRACT:
Fault protection using parallel output CMOS devices for integrated circuit analog switches prevents damage to circuits incorporating the same by not coupling analog input voltages beyond the power supply voltages to the analog output, and by preventing the forward biasing of any P/N junction to provide a low impedance path between such fault analog input voltage and either power supply terminal. Circuitry is provided for having the analog output electrically floating whenever the switch is commanded off, regardless of whether the analog input is within the power supply voltage range or not, to provide the analog input as the analog output whenever the switch is commanded on and the analog input is within the power supply voltage range, and to clamp the analog output at the closest power supply voltage whenever the switch is commanded on and the analog input is beyond the power supply voltage range. Alternate embodiments are disclosed.

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