Reference current circuit capable of preventing occurrence of a

Details Reference current circuit capable of preventing occurrence of a Reference current circuit capable of preventing occurrence of a

1994-12-06

1997-05-06

Krishnan, Aditya

Electricity: power supply or regulation systems

Self-regulating

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

G06F 7556

Patent

active

056274610

ABSTRACT:
A reference current circuit comprises transistors Q.sub.1, Q.sub.2, Q.sub.3, and Q.sub.4 and resistors R.sub.1 and R.sub.2. The resistor R.sub.1 is connected between base and collector electrodes of the transistor Q.sub.1. The resistor R.sub.2 is connected between base and collector electrodes of the transistor Q.sub.3. Emitter electrodes of the transistors Q.sub.1 and Q.sub.2 are connected to ground. The collector of the transistor Q.sub.1 is connected to a base electrode of the transistor Q.sub.2. The base electrode of the transistor Q.sub.1 is connected to the collector electrode of the transistor Q.sub.4. The collector electrode of the transistor Q.sub.2 is connected to the base electrode of the transistor Q.sub.3. Emitter electrodes of the transistors Q.sub.3 and Q.sub.4 are connected to a power supply terminal V.sub.CC which is supplied with a power supply voltage. Each of the transistors Q.sub.1 and Q.sub.3 has a first emitter area. Each of the transistors Q.sub.2 and Q.sub.4 has an emitter area which is equal to e times as large as the first emitter area, where e represents the base of natural logarithm. The reference current circuit may comprise four MOS transistors M.sub.1, M.sub.2, M.sub.3, and M.sub.4 instead of the resistors Q.sub.1 to Q.sub.4. In this event, each of the MOS transistors M.sub.1 and M.sub.3 has a first transconductance. Each of the MOS transistors M.sub.2 and M.sub.4 has a transconductance which is equal to four times as large as the first transconductance.

REFERENCES:
patent: 5465070 (1995-11-01), Koyama et al.
patent: 5481218 (1996-01-01), Nordholt et al.
patent: 5488329 (1996-01-01), Ridgers
patent: 5489868 (1996-02-01), Gilbert
patent: 5521544 (1996-05-01), Hatanaka
by A.G. Van Lienden et al., "Special Correspondence", IEEE Journal of Solid-State Circuits, vol. SC-22, No. 6, Dec. 1987, pp. 1139-1143.

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