A High-Voltage Charge Pump With Pseudo-Continuous Output Regulation Using Dynamic Clock Voltage Scaling

This brief presents a high-voltage charge pump with pseudo-continuous regulation using dynamic clock voltage scaling. We propose a small-signal model of the charge pump to facilitate co-simulation of the linear amplifier and the capacitive switching converter, and it shows good agreement with the time-domain ac simulation results. A novel lead compensation is proposed in the amplifier using current-mirror Miller compensation, which ensures loop stability without a large load capacitor at the charge pump’s output. The proposed regulated charge pump has been implemented in a 65-nm CMOS process, and the chip area is $280~{\mu }$ m ${\times } 300~{\mu }$ m. Operating at a 2.5-V supply, it maintains < 21 mV ripple voltage at 9.6 V output for different load currents and pumping frequencies. The undershoot for the load transient current of 0 to $50~{\mu }$ A with a 160-ns edge time is 58 mV with around $0.8~{\mu }$ s recovery time.