Band-gap reference

Details Band-gap reference Band-gap reference

1990-05-29

1992-01-14

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

323315, 330108, 3072961, G05F 156, H03F 345

Patent

active

050814109

ABSTRACT:
A band-gap reference having a differential amplifier with first and second inputs and an output, and a voltage divider coupled to the differential amplifier output. A first transistor having a base, emitter and collector, has its base coupled to the voltage divider, the first transistor having an emitter current density of x. A second transistor having a base, emitter and collector, has its base coupled to the voltage divider, the second transistor having an emitter current density of nx, where n is fixed. A third transistor having a base, emitter and collector, has its base coupled to the emitter of the first transistor, and its collector coupled to the first input of the differential amplifier. A fourth transistor having a base, emitter and collector, has its base coupled to the emitter of the second transistor, and its collector coupled to the second input of the differential amplifier, and the emitter of the fourth transistor being coupled to the emitter of the third transistor. The threshold voltage term for the band-gap reference is derived by setting the emitter current density for the input transistors of the differential amplifier at a fixed ratio, so that there is only one stable operating point, thereby eliminating the need for additional start-up circuitry and allowing the band-gap reference to be used in transient radiation environments.

REFERENCES:
patent: 3731215 (1973-11-01), Peil et al.
patent: 3956645 (1976-05-01), Boer
patent: 4087758 (1978-05-01), Hareyama
patent: 4413226 (1983-11-01), Davies
patent: 4435678 (1984-03-01), Joseph et al.
patent: 4441070 (1984-04-01), Davies et al.
patent: 4628279 (1986-12-01), Nelson
patent: 4902959 (1990-02-01), Brokaw

Affiliated with

Also associated with

Rating

Band-gap reference does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Band-gap reference, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Band-gap reference will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-543729