Band-gap reference circuit

Details Band-gap reference circuit Band-gap reference circuit

1991-11-01

1992-12-01

Voeltz, Emanuel T.

Electricity: power supply or regulation systems

Self-regulating

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

3072961, 3072966, G05F 330

Patent

active

051682109

ABSTRACT:
For the generation of a junction voltage with a negative temperature coefficient, a band gap reference circuit includes a first semiconductor element (T) and a voltage divider (R3, R4) adapted to generate a measure of the junction voltage across a main current path of a second semiconductor element (T5), a current source (J1) being adapted to generate a reference current with a positive temperature coefficient by means of a resistive element (R1) coupled in series with the main current path. Since the reference current generates a compensation voltage with a positive temperature coefficient across the resistive element (R1) the sum of the measure of the junction voltage and the compensation voltage yields a reference voltage with a specific temperature coefficient, the presence of the voltage divider (R3, R4) inter alia enabling a reference voltage with a temperature coefficient of zero volts per temperature unit to be obtained at comparatively low supply voltages.

REFERENCES:
patent: 4249122 (1981-02-01), Widlar
patent: 4380728 (1983-04-01), Kearney
patent: 4590418 (1986-05-01), Moriarty, Jr.
patent: 4590419 (1986-05-01), Moriarty, Jr.
patent: 4675593 (1987-06-01), Minakuchi
patent: 4833344 (1989-05-01), Moon et al.
patent: 5053640 (1991-10-01), Yum

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