Patent attributes
An integrated circuit is provided that has circuitry containing metal-oxide-semiconductor transistors with body terminals. The body terminals may be biased with an externally supplied body bias voltage that reduces power consumption. During power-up operations, the external body bias voltage may temporarily not be available. In this situation, boost circuitry may produce an internal power supply signal that may be used in place of the unavailable external body bias voltage, thereby reducing leakage currents and power consumption during power up. A multiplexer may be used in routing an appropriate body bias signal to the transistors. The boost circuitry and multiplexer may be controlled by control signals that are generated by control logic. The control logic may produce the control signals by monitoring external and internally generated power supply voltage levels during power up operations.
