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A soft-start strategy for linear and low-dropout voltage regulators based on a successive current-limiting scheme during the startup phase is presented. The proposed current-limiting scheme incorporates a digitally-programmable mechanism for precisely controlling the current profile of the pass device during the startup transient. The proposed scheme is compact, as it requires no external components...
The attenuation of supply noise is crucial in those sensor interface circuits that require the detection of the small signal capacitance. This paper presents an integrated charge-pump based continuous frequency regulator for precision supply voltage generation. The circuit is able to operate with external supply voltage ranging from 3.0 V to 5.5 V. The charge-pump generates a nominal voltage of 3...
This paper presents low power circuit design for voltage regulator and resistor to digital converter that are used in a RFID-like sensing circuit for measuring the resistance of a sol-gel sensor. The regulator circuit has simple circuit structure and consumes zero DC current (except the current drained by its load). The resistor to digital converter consists of a cascoded current mirror, a reference...
A fully-integrated soft-start circuit for voltage regulators is presented in this brief. A soft-start strategy based on an extremum selector and a linearly ramped-up reference is developed to prevent any massive in-rush current through the power device during the start-up phase of the regulator. The strategy is realized by a compact on-chip circuit that requires no external components and has minimal...
This paper presents novel frequency compensation techniques for low-dropout (LDO) voltage regulator. An enhanced active feedback frequency compensation is employed to improve its frequency response. This LDO can provide high stability for loading current range up to 100 mA without loading capacitors. Moreover, the total compensation capacitors only require 7 pF for this technique. This allows us to...
This paper presents a full on-chip low-dropout voltage regulator (LDO) for slot based applications like e.g. digital cordless telephones. The LDO uses a floating and charged capacitor to drive the gate of an nMOS pass transistor. The LDO has been integrated in a 0.18 mum CMOS technology. The LDO is designed for 20 mA output current with a 200 mV dropout voltage and occupies 0.033 mm2 of die area....
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