Patent ID: 7863689

Claim:
An apparatus, comprising: a MOS transistor having a source terminal, a drain terminal, a gate terminal and a well terminal; a control diode coupled between said well terminal and said gate terminal, said control diode constructed to provide a barrier voltage that is sufficiently below a barrier voltage of a diode formed between said well terminal of said MOS transistor and said source terminal of said MOS transistor, to effect a dynamic threshold voltage control; and a capacitor coupled between said well terminal of said MOS transistor and said gate terminal of said MOS transistor and constructed to exhibit any of the properties of changing said well potential rapidly and enhancing transient drive capability of said MOS transistor; wherein said apparatus is so constructed that said control diode is forward biased when gate voltage of said MOS transistor is approximately equal to source voltage of said MOS transistor, and wherein said control diode is constructed to act as a clamp that holds said well at one diode voltage drop above a low gate voltage.