Patent ID: 7317346

Claim:
An apparatus, comprising: a level shifting device coupled to a variable supply voltage source and an input source device to respectively receive the supply voltage and an input signal and generate an output signal based at least on the input signal; a bias generator coupled to the variable supply voltage source to generate a varying bias voltage based on a value of the supply voltage; a signal generating device coupled to the bias generator and level shifting device, to receive the varying bias voltage and transmit the generated varying bias voltage based on a control voltage, the signal generating device including one of: an NMOS device to transmit the bias voltage of at least zero volts to a bias input of the level shifting device in response to the control voltage applied to a gate of said NMOS device, or a PMOS device to transmit the bias voltage of less than zero volts to a bias input of said level shifting device in response to the control voltage applied to a gate of said PMOS device; and a control voltage generator coupled to the supply voltage and signal generating device to generate said control voltage to be applied to respective one of said gate of said NMOS device or said gate of said PMOS device.