Patent ID: 7548480

Claim:
A circuit for supplying power to a sense amplifier in a semiconductor memory apparatus, comprising: a compensation controlling unit configured to generate a compensation control signal to determine power compensation, in response to a refresh signal; a compensation voltage input node which is applied with a first voltage; a power compensating unit configured to selectively supply the compensation voltage input node with a second voltage in response to the compensation control signal; and a power supply unit configured to supply a voltage at the compensation voltage input node or the second voltage to a sense-amp driver in response to a first power control signal or a second power control signal, wherein the power supply unit comprises: an output terminal; a first transistor having a gate terminal configured to receive the first power control signal, a drain terminal configured to receive the second voltage, and a source terminal coupled with the output terminal; and a second transistor having a gate terminal configured to receive the second power control signal, a drain terminal coupled to the compensation voltage input node, and a source terminal coupled with the output terminal.