| 摘要 |
A design for reducing the power dissipation in an integrated circuit for an image pickup device. Placing a circuit block ( 2 ), such as for generating a driving signal to an image pickup apparatus, in a standby state within a vertical blanking period or horizontal blanking period reduces the power dissipation at the circuit block ( 2 ). Since the blanking period is short, it is necessary to rapidly restore normal operation from standby so as to ensure the standby time. A switch ( 6 ) is provided between a terminal of the circuit block ( 2 ) and a capacitor ( 4 ) that is provided for voltage regulation at the terminal. A controller ( 8 ) turns off the switch ( 6 ) and disconnects the capacitor ( 4 ) from the circuit block ( 2 ) in a period where the circuit block ( 2 ) is placed in a standby state. As a result, variations in the amount of stored charge in the capacitor ( 4 ) during standby are suppressed, and while resetting to normal operation the time for returning the capacitor ( 4 ) to the amount of stored charge for normal operation is shortened so that the reset operation is performed rapidly.
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