Circuit and method for reducing a gate volage of a transmission

Details Circuit and method for reducing a gate volage of a transmission Circuit and method for reducing a gate volage of a transmission

1994-11-03

1996-07-23

Nelms, David C.

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Signal transmission integrity or spurious noise override

327391, 327530, 327535, 327536, 327537, H03K 1716, G05F 110

Patent

active

055393519

ABSTRACT:
A circuit and method for reducing a gate voltage of a transmission gate to prevent overvoltage that could damage or affect reliability of the transmission gate. The transmission gate resides in a charge pump circuit (41) coupled to a capacitor for generating a voltage greater than a power supply voltage. A buffer (44,45) receives a control signal and couples to a gate terminal of the transmission gate. The buffer (44,45) includes a power supply terminal that is coupled to a variable voltage reference (43). The variable voltage reference (43) provides a voltage that reduces the gate voltage of the transmission gate when an output voltage of the charge pump circuit reaches a predetermined voltage. The variable voltage reference (43) reduces a voltage range between logic levels provided by the buffer (44,45) to protect the transmission gate from an excessive voltage.

REFERENCES:
patent: 5392205 (1995-02-01), Zavaleta
patent: 5434525 (1995-07-01), Leonowich

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