Reference current source for low supply voltage operation

Details Reference current source for low supply voltage operation Reference current source for low supply voltage operation

1993-08-12

1996-05-14

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

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

323901, 323907, 323312, G05F 320

Patent

active

055171036

ABSTRACT:
A circuit for providing a reference current comprises first and second matched transistors, each of which has a control node and a controllable path and each of which is connected so that a current setting resistor is in the controllable path of the second matched transistor, the current setting resistor having a value, current set in the controllable path of the second matched transistor is related to a difference in voltage characteristics between the first and second matched transistors and to the value of the current setting resistor, and third and fourth matched transistors, each of the third and fourth matched transistors having a controllable path connected respectively to the controllable paths of the first and second matched transistors, and control electrodes of the third and fourth matched transistors connected together; a set of output transistors connected to the circuit to supply the reference current in dependence on a set current; and a fifth transistor having a controllable path between a bias node related to a first supply voltage level and a node set at one voltage characteristic relative to a second supply voltage level so as to maintain a voltage across one of the third and fourth matched transistors at a value which is independent of the first supply voltage level to reduce a magnitude of changes in the reference current as a function of the first supply voltage, the fifth transistor having a control electrode connected to the conductive path of the first matched transistor.

REFERENCES:
patent: 4119924 (1978-10-01), Ahmed
patent: 4260945 (1981-04-01), Ahmed
patent: 4412186 (1983-10-01), Nagano
patent: 4558272 (1985-12-01), Grosch
patent: 4879524 (1989-11-01), Bell
patent: 5293112 (1994-03-01), Takahashi
patent: 5349286 (1994-09-01), Marshall et al.

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