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Low-Voltage Series Regulator Without Auxiliary Voltage

IP.com Disclosure Number: IPCOM000074386D
Original Publication Date: 1971-Apr-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Claassen, CH: AUTHOR

Abstract

This series regulator circuit is capable of regulating its output voltage down to one volt or below without needing an auxiliary voltage to power the comparator amplifier.

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Low-Voltage Series Regulator Without Auxiliary Voltage

This series regulator circuit is capable of regulating its output voltage down to one volt or below without needing an auxiliary voltage to power the comparator amplifier.

This is accomplished by using devices of opposite polarities to that of series pass element and powering the reference and the comparator amplifier from the bulk supply voltage. Thus, for a positive voltage, the series pass elements consist of NPN transistors T1 and T2 and the comparator consists of transistors T3, T4 and T5. As can be seen from the drawing, the comparator is powered from the bulk supply and the reference voltage is generated by means of resistors R1 and R2 and the zener diode D1

For negative voltage regulation, the polarity of the devices need only be changed and again only the bulk supply is needed.

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