Band-gap voltage reference

Details Band-gap voltage reference Band-gap voltage reference

H - Electricity

03

L

328/199

H03L 5/00 (2006.01) G05F 3/30 (2006.01)

Patent

CA 1142607

ABSTRACT OF THE DISCLOSURE 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 compen- sating 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 table reference source. -1-

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