Patent ID: 7262631
Filing Date: 2007-08-28
Classification: H03K

Abstract:
1. A voltage level control device for controlling a voltage level supplied from a first voltage level source to circuitry, said voltage level supplied having one of at least four voltage levels, said circuitry being arranged between said first voltage level source and a second voltage level source, said first and second voltage level sources being operable to output different voltage levels; said voltage level control device comprising: a power transistor connected between said first voltage level source and said circuitry, said power transistor comprising a sleep signal input operable to receive a sleep signal; at least two switching devices connected in parallel with said power transistor and comprising at least two sleep signal inputs operable to receive at least two pseudo sleep signals; said voltage level control device is responsive to said sleep signal and said at least two pseudo sleep signals to output to said circuitry an output voltage said output voltage comprising one of said at least four voltage levels, said at least four voltage levels lying between voltage levels output by said first and second voltage sources; said at least four voltage levels comprise a first voltage level substantially equal to or approaching said voltage level of said first voltage source; a second voltage level substantially equal to or approaching said voltage level of said second voltage source; and at least two intermediate voltage levels, said at least two intermediate voltage levels lying between said first and second voltage levels; wherein said voltage level control device is responsive to