Theoretical and experimental analysis of Dickson charge pump output resistance

This paper presents an analytical and experimental evaluation of the output resistance of Dickson charge pumps. This work is conceived to obtain an accurate estimation of the parameters affecting the charge pump output resistance, with particular attention to the capacitance connected to the output node of the circuit. The aim is to evaluate the impact of this element over charge pump performance in terms of output resistance and, hence, of power efficiency, output voltage and driving capability. The presented analysis gives a suitable criterion for properly sizing the charge pump capacitors, which allows the charge pump performance to be optimized. Simulated and experimental results are provided so as to validate the proposed model