Electricity: power supply or regulation systems – Self-regulating – Using a three or more terminal semiconductive device as the...
Patent
1994-04-18
1996-11-05
Nguyen, Matthew V.
Electricity: power supply or regulation systems
Self-regulating
Using a three or more terminal semiconductive device as the...
323316, G05F 316, G05F 320
Patent
active
055721141
ABSTRACT:
A semiconductor integrated circuit for performing a current mirror function and capable of operating stably at a low supply voltage to yield an output current nearly equal to the reference current. The current mirror circuit includes a pair of horizontal type pnp transistors and a vertical type npn transistor having an area almost equal to that of either of the pair of horizontal transistors, the vertical type npn transistor being used as a reverse transistor. A current source supplies the base current of the horizontal transistors as well as the collector current of the vertical transistor. Because of its structure, it is possible for the vertical transistor to have a base area and static forward current transfer ratio greater than those of the horizontal transistors. Since the emitter area of the vertical transistor is large, even when it is used to function as a reverse transistor, its static forward current transfer ratio is high. Through using this vertical transistor as a reverse transistor, the effect of the base current of the horizontal transistors on the reference current is reduced.
REFERENCES:
patent: 4857864 (1989-08-01), Tanaka
patent: 4937515 (1990-06-01), Yoshino
patent: 5164658 (1992-11-01), Kuwahara
patent: 5376822 (1994-01-01), Taguchi
patent: 5394079 (1995-02-01), Llewellyn
Donaldson Richard L.
Hiller William E.
Nguyen Matthew V.
Texas Instruments Incorporated
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