Current mirror and self-starting reference current generator

Details Current mirror and self-starting reference current generator Current mirror and self-starting reference current generator

1995-10-05

1997-03-18

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

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

323314, G05F 316

Patent

active

056126140

ABSTRACT:
A current mirror (100) has an input stage (104) and an output stage (106), both preferably employing FET's. (Field Effect Transistors) An amplifier (102) equalizes drain-to-source voltages between FET's in the input and output stages to provide a higher output impedance. A resistance (R1), coupled in series with an FET in the output stage (106), provides degenerative feedback. A reference current generator (400) is constructed of two such current mirrors, one being the compliment of the other, to provide one or more stable reference currents. Loop gain of the reference current generator (400) is greater than one at start-up, but degenerative feedback reduces the loop gain to one at a predetermined stable operating point.

REFERENCES:
patent: 5545972 (1996-08-01), Kiehl
patent: 5559425 (1996-09-01), Allman
patent: 5563502 (1996-08-01), Akioka et al.
patent: 5581174 (1996-12-01), Fronen

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