Temperature compensated voltage regulator and reference circuit

Details Temperature compensated voltage regulator and reference circuit Temperature compensated voltage regulator and reference circuit

1989-09-15

1991-06-11

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

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

323907, 3072967, G05F 320

Patent

active

050235435

ABSTRACT:
The temperature compensated reference circuit has a first common emitter BJT whose base is connected to a first JFET current source and through a JFET resistor to a voltage output. The JFET resistor is biased in the linear region and the JFET current source is biased in the saturation region in an operating condition. The voltage across the JFET resistor is selected to be approximately equal to the pinch-off voltage of the JFET current source. The temperature co-efficient of the first BJT and JFET resistor will cancel one another to produce a generally temperature invariant voltage at the output. The voltage regulator incorporates the reference circuit and has a second BJT current source driving the reference circuit. A feedback system includes a second JFET current source between the collector of the first BJT and the connection between the voltage output and the collector of the second BJT. The second JFET current source drives the base of a common emitter third BJT. The collector of the third BJT is connected through a resistor to the base of the second BJT. The feedback system regulates the amount of current necessary to drive the reference circuit and the load.

REFERENCES:
patent: 3899693 (1975-08-01), Gaudreault
patent: 4100478 (1978-07-01), Tam
patent: 4716356 (1987-12-01), Vyne et al.
patent: 4843303 (1989-06-01), Shoji

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