A 0.45-to-1.2-V Fully Digital Low-Dropout Voltage Regulator With Fast-Transient Controller for Near/Subthreshold Circuits

PROJECT TITLE :

A 0.45-to-1.2-V Fully Digital Low-Dropout Voltage Regulator With Fast-Transient Controller for Near/Subthreshold Circuits

ABSTRACT:

An occasional quiescent current digital low-dropout (DLDO) voltage regulator with fast-transient response time is proposed for self-powered wireless sensor applications operating at near/subthreshold provide voltage. The D-LDO regulator incorporates both hill-climbing and binary search algorithms (HCBS) within the management logic, so leveraging on each other's strengths to minimize the output voltage's ripple and also the quiescent current during the steady-state amount furthermore output voltage's spike and response time throughout the transition amount. Extra features like hysteresis mode management and freeze mode control are incorporated into the system to improve the performance of the D-LDO regulator. A dynamic comparator is proposed for the close to/subthreshold supply voltage operation, that minimizes the voltage error and improves the utmost operating frequency. Fabricated in 130-nm CMOS technology, the D-LDO regulator regulates the output voltage VOUT from 350 to 1150 mV, whereas the input provide voltage VIN ranges from 450 to 120zero mV. At a VOUT of 450 mV, VIN of 500 mV and an operating frequency of ten MHz, the regulator delivers 150zero-μA load current with IQUIESCENT of eight.nine μA and a transient response time of one.half dozen μs. The most current and power efficiencies reach ninety nine.nine% and 89.nine%, respectively. The measured line regulation and cargo regulation are one.vi and zero.vi mV/mA, respectively.

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