Pass gate circuit with body bias control

Details Pass gate circuit with body bias control Pass gate circuit with body bias control

1997-04-22

1999-03-09

Wambach, Margaret R.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

327388, 327434, 327535, H03K 301

Patent

active

058806202

ABSTRACT:
A pass gate circuit includes a pass transistor and a body bias control circuit for biasing the body of the pass transistor to reduce body effect. The body bias control circuit includes one or more control transistors arranged to selectively connect the substrate (body) of the pass transistor to the drain or gate of the pass transistor when predetermined voltages are applied to the drain and gate of the pass transistor. As a result, the pass transistor exhibits a reduced body effect in the on-state. In one embodiment, the body bias control circuit includes a first control transistor having a drain and gate connected to the gate of the pass transistor, a gate connected to the drain of the pass transistor, and a source. The body bias control circuit also includes a second control transistor having a drain connected to the source of the first control transistor, a source connected to a body of the pass transistor, and a gate connected to the drain of the pass transistor. The bodies of the pass transistor, first control transistor and second control transistor are electrically interconnected. With this arrangement, the body of the pass transistor is biased "high" by the gate of the pass transistor only when both the gate and drain of the pass transistor are at a high voltage level.

REFERENCES:
patent: 5767733 (1998-06-01), Grugett

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