Charge pump and CMOS image sensor
A technology of image sensor and charge pump, applied in image communication, TV, color TV, etc., can solve the problems of low efficiency and large area of charge pump, and achieve the effect of improving efficiency
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[0022] Through the analysis of the working process of the current Dickson charge pump, it can be obtained that in a certain clock (PH0 or PH1) in the Dickson charge pump, only one phase has charge pumped to the external capacitor COUT, so the efficiency is low. Moreover, the Dickson charge pump can only increase the voltage step by step through multiple boost stages in order to achieve the voltage required for driving the pixels of the CMOS image sensor, which will inevitably increase the capacitor area. Therefore, the boost stage structure of the current Dickson charge pump limits its boost boost efficiency and area reduction.
[0023] Therefore, in view of the above problems, a feasible method is to enable the charge pump to boost the voltage in both phases of the clock (high-level phase and low-level phase), so as to improve the boosting efficiency accordingly, and can correspondingly increase the area. reduce. Based on this, an embodiment of the charge pump of the present...
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