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United States Patent 4,250,445

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1 Author(s)

A temperature-compensated band-gap reference of the type employing two transistors operated at different current densities to develop a positive TC current. This current flows through a first resistor of nominal TC to develop a positive TC voltage which is connected in series with a negative TC voltage developed by the base-to-emitter voltage of a transistor, to produce a composite temperature compensated output voltage. The circuitry further includes a second resistor connected in series with the first resistor and having a positive TC to produce an additional compensating voltage having a temperature coefficient following a parabolic expression. This additional voltage, when connected with the other components of the output voltage, reduces the small residual inherent TC of the band-gap reference to provide a more stable reference source.

Published in:

Solid-State Circuits Magazine, IEEE  (Volume:5 ,  Issue: 3 )

Date of Publication:

Summer 2013

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