摘要 |
PROBLEM TO BE SOLVED: To provide a voltage boosting/step-down circuit for miniaturizing an apparatus by simplifying the circuit constitution. SOLUTION: The voltage boosting/step-down circuit is provided with a voltage dropping section 22 for receiving a system clock pulse, alternately repeated between a reference voltage (GND) and a system voltage V<SB>DD</SB>, utilizing the potential difference between the reference voltage (GND) and the system voltage V<SB>DD</SB>, and outputting a voltage V<SB>4</SB>lower than the reference voltage (GND); a level shifter 24 for receiving the system clock pulse and the voltage V<SB>4</SB>outputted from the voltage dropping section 22, and outputting a pulse signal V<SB>O</SB>, having a potential difference larger than the potential difference between the reference voltage (GND) and the system voltage V<SB>DD</SB>; and a voltage booster 26 for receiving the pulse signal V<SB>O</SB>, outputted from the level shifting section 24, and outputting a voltage V<SB>7</SB>higher than the reference voltage (GND). Such a circuit will make the circuit small sized. COPYRIGHT: (C)2006,JPO&NCIPI
|