Trimmable current source

Details Trimmable current source Trimmable current source

1986-12-24

1988-04-05

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307310, 307580, 323907, H03K 17687, H03K 326

Patent

active

047361263

ABSTRACT:
A JFET circuit generates an adjustable current having a temperature coefficient proportional to I.sub.DSS where I.sub.DSS is the drain current of a JFET when its source and gate are shorted. The JFET has a source terminal coupled to a source of supply voltage. An adjustable resistor is coupled between the gate and source terminals of the JFET. A reference current is supplied to the resistor, which reference current is proportional to the JFET's pinch-off voltage. The desired current appears at the drain of the JFET.

REFERENCES:
patent: 3638049 (1972-01-01), Bom
patent: 3700934 (1972-10-01), Swain
patent: 4283641 (1981-08-01), Skingley
patent: 4347476 (1982-08-01), Tam
patent: 4453121 (1984-06-01), Noufer
IEEE Journal of Solid-State Circuits, vol. SC14, No. 6, "Temperature Compensated Quad Analog Switch", Adib R. Hamade, Dec. 1979, pp. 944-952.

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