Patent ID: 8237480

Claim:
An image sensing apparatus comprising a clock generation circuit that generates and outputs first and second clocks that have a different delay time relative to an external clock, and a pixel array having a plurality of pixels, and configured to operate in accordance with signals which are generated based on the first and second clocks, the clock generation circuit comprising: a first generation unit that generates, by causing the external clock to pass through a first delay element, the first clock that has a first delay time depending on a propagation delay time of the first delay element relative to the external clock, and outputs the generated first clock; a second generation unit that generates, by causing the external clock to pass through a second delay element, the second clock that has a second delay time depending on a propagation delay time of the second delay element relative to the external clock, and outputs the generated second clock; and a control unit that, using a plurality of third delay elements that respectively have a propagation delay time that correlates with the propagation delay time of the first delay element, and correlates with the propagation delay time of the second delay element, generates a control signal for controlling the third delay elements such that a total of propagation delay times of the plurality of third delay elements corresponds to a target value depending on a cycle of the external clock, and controls the propagation delay time of the first delay element, the propagation delay time of the second delay element, and the propagation delay times of the third delay elements using the control signal.