A Low Ripple Current Mode Voltage Doubler

Experimental results of a fully integrated low ripple charge pump voltage converter are presented. The pump is a current mode voltage doubler with a novel parasitic capacitance precharge mechanism for output voltage ripple reduction. A prototype of the pump was designed and fabricated in 130 nm CMOS process. The pump supplied with 1.2 V delivers 1.5 V on its output. Despite reducing the size of the filtering capacitor (down to 5.2 % of the "flying" capacitor), the ripple level is 50 mV.