Patent ID: 6833748
Filing Date: 2004-12-21
Classification: G05F,H03K

Abstract:
A voltage supply circuit, comprising:a circuit that operates separately in a standby mode and in an active mode; a standby mode bias supply unit that controls an external high voltage level power supply voltage and an external low voltage level power supply voltage to be a first target high voltage and a first target low voltage, depending on a standby control signal if the circuit is in the standby mode, and then supplies the first target high voltage and the first target low voltage to the circuit; and an active mode bias supply unit generating a second target high voltage lower than the first target high voltage and a second target low voltage higher than the first target low voltage, depending on an active control signal if the circuit is in the active mode, and then supplies the second target high voltage and the second target low voltage to the circuit, wherein the standby mode bias supply unit comprises a high voltage level bias supply unit that controls the external high voltage level power supply voltage to be the first target high voltage, and a low voltage level bias supply unit that controls the external low voltage level power supply voltage to be the first target low voltage, the low voltage level bias supply unit comprising a first switching means connected between an external low voltage level power supply voltage terminal and a first output terminal connected to a first input terminal of the circuit, and a first compare means for comparing a voltage of the first output terminal and a reference low voltage level power supply voltage of the standby mode to control the first switching means, depending on the standby control signal.