Design Strategy for 2-phase Switched Capacitor Charge Pump

Switched capacitor charge pump circuits are commonly used to generate high voltage in integrated circuits which operate at low supply voltage. This paper presented a modular structure for the design and implementation of a two phase switched capacitor charge pump with arbitrary integer gain ratio using minimal number of fly-wheel capacitors. Moreover, the proposed method is able to generate the switched capacitor circuit in a simple modular fashion, which assist to facilitate automation circuit generation in modern VLSI circuit design. A design example is presented in the paper to demonstrate the design efficiency of the proposed method. The deficiency of previous design methods are reviewed. The proposed method is shown to be able to achieve the minimal number of fly-wheel capacitors and offer a simple and modular physical implementation structure that is readily applicable to automatic circuit generation system.