Abstract: A tri-state output buffer is provided which incorporates a dynamic depletion mode circuit. The tri-state buffer has an output driver circuit which includes a pull-up and a pull-down transistor device. Rapid switching of the pull-up transistor from a nonconducting state to a conducting state is accomplished with a bootstrap circuit. The bootstrap circuit includes a capacitor and a dynamic depletion mode switching device. The dynamic depletion mode device acts to rapidly transfer the charge from the capacitor to the gate of the pull-up transistor. Additionally an invertor or voltage driver, connected between the bootstrap circuit dynamic depletion mode switching device and the capacitor provides a voltage jump across said capacitor to further increase the switching speed of the pull-up transistor.

Abstract: An improved regulator circuit alters the back bias generator voltage at the substrate of an MOS integrated circuit. The regulator circuit is responsive not only to circuit parameters sensed by prior art regulators, but to additional ones including internal clock pulse voltage levels.