JFET pinch off voltage proportional reference current generating

Details JFET pinch off voltage proportional reference current generating JFET pinch off voltage proportional reference current generating

1986-12-19

1987-12-29

Salce, Patrick R.

Electricity: power supply or regulation systems

Self-regulating

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

307491, G05F 308

Patent

active

047163569

ABSTRACT:
A circuit for generating a reference current proportional over temperature to the pinch-off voltage of a first JFET includes second and third JFETS and first and second resistors. The second JFET has its gate coupled to its source and produces a current which drives the first JFET. Since the width-to-length ratio of the second JFET is greater than that of the first, a negative gate-to-source voltage of the first JFET is produced across the first resistor. The third JFET has a source coupled via the second resistor to the gate of the first JFET and has a gate coupled to the drain of the first JFET for setting the voltage thereat. The reference current appears at the drain of the third JFET.

REFERENCES:
patent: 4449067 (1984-05-01), Nishikawa
patent: 4645998 (1987-02-01), Shinohara et al.

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