| 摘要 |
A charge pump circuit has an input voltage generating circuit and a voltage step-up circuit. The input voltage generating circuit has a constant current circuit that generates a constant current, a charge transfer correction device that generates a correction voltage based on the constant current, a constant voltage circuit that generates a constant voltage, and a buffer amplifier that outputs an input voltage obtained by adding the correction voltage to the constant voltage. The voltage step-up circuit has charge transfer devices, capacitors and a clock driver. The charge transfer devices are connected in series to an output terminal of the buffer amplifier and are made of the same element as and have substantially the same characteristic as that of the charge transfer correction device. Each of the capacitors has one end connected to each connection point of each of the plurality of charge transfer devices. The clock driver uses the input voltage as a power supply voltage, generates clock pulses having opposite phases based on the power supply voltage, and alternately supplies the clock pulses to another end of each of the plurality of capacitors.
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