Zener referenced voltage circuit

Details Zener referenced voltage circuit Zener referenced voltage circuit

1987-05-29

1988-09-27

Salce, Patrick R.

Electricity: power supply or regulation systems

Self-regulating

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

323231, G05F 320

Patent

active

047744529

ABSTRACT:
A zener diode is connected at one end via a first impedance to a first power terminal. The base-to-emitter junctions of first and second transistors are connected in parallel between the other end of the zener diode and a second power terminal. The collector of the first transistor is connected to the one end of the zener diode to regulate the zener current and hence the zener voltage. A third transistor is coupled at its base to the one end of the zener and its emitter is connected to an output terminal to produce an output voltage which is a function of the zener voltage. The collector of the second transistor is connected to the emitter of the third transistor to pass a current through the third transistor which is approximately equal to the current through the first and second transistors whereby the base-to emitter junction of the third transistor and its temperature variations have little, if any, effect on the output voltage.

REFERENCES:
patent: 3310731 (1967-03-01), Ostroff et al.
patent: 3916508 (1975-11-01), Conzelman et al.
patent: 4290005 (1981-09-01), Arumugham
patent: 4352056 (1982-09-01), Cave et al.
patent: 4560919 (1985-12-01), Ishikawa et al.
patent: 4609863 (1986-09-01), Asai et al.

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