Browse Prior Art Database

Low Complexity Reference Voltage Generator

IP.com Disclosure Number: IPCOM000048200D
Original Publication Date: 1981-Dec-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 21K

Publishing Venue

IBM

Related People

Beranger, H: AUTHOR [+2]

Abstract

The reference voltage generator shown above provides a low internal resistor in an extended range of loading current IL sunk into the generator and presents low sensitivity to supply variations.

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Low Complexity Reference Voltage Generator

The reference voltage generator shown above provides a low internal resistor in an extended range of loading current IL sunk into the generator and presents low sensitivity to supply variations.

The potential at node B is fixed by the base to emitter voltage of transistor T1 (VBE (T1)), and the output voltage VREF is equal to VBE(T1) - R2.VBE(T2)/(R1+R2)

The generator behaves as a clamp circuit; an increase in the loading current provides an increase in VBE(T1) without any threshold limit. The internal resistance is determined by the ballast current through resistor RO.

To compensate for the variations in the supply VP, the ratio of currents flowing through transistor T2 and through the resistor bridge R1, R2 is chosen so that the VBE of transistor T2 varies more than the VBE of transistor T1, so that the output voltage remains constant.

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