Fast transient frequency control voltage regulator using push-pull dynamic leaker circuit

A novel technique of fast transient response for frequency control voltage regulator is presented in this paper. For an embedded switched capacitor based DC-DC converter, poor transient response of frequency control voltage regulator is improved with the help of a push-pull dynamic leaker circuit. Push-pull dynamic leaker paths have been used to reduce both peak and dip at the output during load transient or line transient. Introduction of push pull dynamic leaker path in parallel with existing frequency control regulator also helps to reduce settling time drastically with marginal increment of static power loss. The proposed scheme is most suitable for digital applications, where load changes from minimum to maximum or vice-versa in few nanoseconds. The proposed dynamic leaker circuit is implemented with the frequency control voltage regulator in 0.18μm CMOS process for 3.3V to 1.35V conversion. 10% settling time of the regulator is less than 10ns whereas peaks and dips are within 17% of regulated output for Ins load transient time.