Band-gap reference circuit for use with cmos ic chips

Details Band-gap reference circuit for use with cmos ic chips Band-gap reference circuit for use with cmos ic chips

G - Physics

05

F

330/12, 328/173,

G05F 3/20 (2006.01) G05F 3/30 (2006.01)

Patent

CA 1275439

ABSTRACT OF THE DISCLOSURE A band-gap reference circuit having a pair of transistors operated at different current densities to pro- duce a positive temperature coefficient (TC) signal propor- tional to the .DELTA.VBE of the two transistors and combined with a negative TC voltage derived from the VBE of one of the transistors to produce a composite signal substantially invariant with temperature. The .DELTA.VBE signal component is increased in magnitude by connecting resistor string bias circuit to each of the transistors, to effectively multiply the VBE of each transistor, and thereby multiply the .DELTA.VBE signal. The composite signal is sensed in the emitter circuits of the two transistors, so that it is unnecessary to access the collectors of the transistors, thereby making it readily possible to use the circuit with CMOS IC devices.

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