Patent ID: 7750722
Filing Date: 2010-07-06
Classification: H02M

Abstract:
1. A charge pump circuit comprising: a constant current circuit for generating a constant current; a charge transfer correction device for generating a correction voltage based on the constant current; a constant voltage circuit for generating a constant voltage; a buffer amplifier for outputting an input voltage obtained by adding the correction voltage from the charge transfer correction device to the constant voltage from the constant voltage circuit; a plurality of charge transfer devices connected in series to an output terminal of the buffer amplifier, each of the charge transfer devices being made of the same element as and having substantially the same characteristic as that of the charge transfer correction device; a plurality of capacitors each having one end connected to each connection point of each of the plurality of charge transfer devices; and a clock driver for using the input voltage as a power supply voltage, generating clock pulses having opposite phases based on the power supply voltage, and alternately supplying the clock pulses to another end of each of the plurality of capacitors.