| CPC G09G 3/3648 (2013.01) [H02M 3/07 (2013.01); G09G 3/2096 (2013.01); G09G 2330/02 (2013.01)] | 8 Claims |
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1. A voltage generation circuit, comprising:
a charge pump circuit configured to boost an input voltage to generate an output voltage;
a signal supply circuit configured to supply to the charge pump circuit a first clock signal and a second clock signal, which are a pair of signals controlling an operation of the charge pump circuit and in which a predetermined time difference is provided between a timing of a change in signal level of one signal and a timing of a change in signal level of the other signal; and
a control circuit configured to supply to the signal supply circuit a first enable signal that controls start and stop of oscillation of the first clock signal and the second clock signal according to a change in signal level,
wherein the charge pump circuit comprises:
a first capacitor and a second capacitor each having a predetermined capacitance;
a first switch element group configured to be turned on and off in response to application of the first clock signal and connect a first voltage supply line and the first capacitor when turned on;
a second switch element group configured to be turned on and off in response to application of the first clock signal and connect a second voltage supply line and the second capacitor when turned on; and
a third switch element group configured to be turned on and off in response to application of the second clock signal and connect a voltage output line of the output voltage and the first capacitor and the second capacitor when turned on,
wherein the control circuit is configured to control a timing of a signal change of the first enable signal so that the signal levels of the first clock signal and the second clock signal are fixed at a timing when the first switch element group and the second switch element group change from an off state to an on state, in response to stopping oscillation of the first clock signal and the second clock signal.
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