Current reference circuit using PTAT and inverse PTAT subcircuit

Details Current reference circuit using PTAT and inverse PTAT subcircuit Current reference circuit using PTAT and inverse PTAT subcircuit

1995-10-24

1997-02-18

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

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

323907, G05F 330

Patent

active

056044275

ABSTRACT:
A current reference circuit producing a reference current without temperature dependence and operating at a low supply voltage, which includes a first current source for producing a first constant current having a positive temperature coefficient, a second current source for producing a second constant current having a negative temperature coefficient, and an adder for adding the first and second constant currents to cancel their positive and negative temperature coefficients. The second current source contains first and second bipolar transistors and a resistor connected between a base and an emitter of the first bipolar transistor, and a bias subcircuit for supplying the reference current to the first bipolar transistor. The emitter of the first bipolar transistor is connected to an emitter of the second bipolar transistor, and a collector of the first bipolar transistor is connected to a base of the second bipolar transistor. The resistor is supplied with a current having a negative temperature coefficient. The second bipolar transistor is driven by a driving current having a negative temperature coefficient. A collector current of the second bipolar transistor acts as the second constant current.

REFERENCES:
patent: 4628248 (1986-12-01), Birrittella et al.
patent: 5029295 (1991-07-01), Bennett et al.
patent: 5258703 (1993-11-01), Pham et al.
Y. Deval et al., "Ratiometric Temperature Stable Current Reference", Electronics Letters, vol. 29, No. 14, Jul. 8, 1993, pp. 1284-1285.
A. G. Van Lienden et al., "Latch-Up in Bipolar Low-Voltage Current Sources", IEEE Journal of Solid-State Circuits, vol. SC-22, No. 6, Dec. 1987, pp. 1139-1143.
K. Kimura, "Low Temperature Coefficient CMOS Voltage Reference Circuits", IEICE Trans. Fundamentals, vol. E77-A, No. 2, Feb. 1994, pp. 398-402.

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