| 摘要 |
A reference voltage generating circuit for outputting a reference voltage having a level varying depending on the operation mode of a semiconductor device is disclosed. The reference voltage generating circuit includes a first reference voltage generator that outputs first and second initial reference voltages having different levels, a second reference voltage generator that outputs a third initial reference voltage in response to a first control signal enabled for a first predetermined time when the semiconductor device exits a first operation mode and enters a second operation mode, a multiplexer (MUX) that outputs the second initial reference voltage as a preliminary reference voltage during the first operation mode, outputs, as the preliminary reference voltage, a voltage driven by both the first initial reference voltage and the third initial reference voltage for the first predetermined time when the semiconductor device exits the first operation mode and enters the second operation mode, and outputs the first initial reference voltage as the preliminary reference voltage after the first predetermined time elapses after the semiconductor device enters the second operation mode, and a buffer that buffers the preliminary reference voltage output from the MUX, and outputs the buffered voltage as a reference voltage.
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