Current reference circuit having both a PTAT subcircuit and an i

Details Current reference circuit having both a PTAT subcircuit and an i Current reference circuit having both a PTAT subcircuit and an i

1997-05-29

1999-11-23

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

External effect

Temperature

327538, 327530, 323312, 323315, H01L 3500

Patent

active

059907274

ABSTRACT:
A current reference circuit is capable of operation at a very low supply voltage, such as 1 volt. The current reference circuit is composed of a current mirror circuit, serving as an inverse PTAT (i.e., inversely proportional to absolute temperature) subcircuit, and a PTAT subcircuit for driving the current mirror circuit. The current mirror circuit and the PTAT subcircuit are mutually biased to each other. First and second constant currents produced by the PTAT subcircuit are supplied to the current mirror circuit as its reference and mirror currents, thereby cancelling the temperature coefficients of the first and second constant currents.

REFERENCES:
patent: 4507573 (1985-03-01), Nagano
patent: 5034626 (1991-07-01), Pirez et al.
patent: 5038053 (1991-08-01), Djenguerian et al.
patent: 5357149 (1994-10-01), Kimura
patent: 5438296 (1995-08-01), Kimura
patent: 5481224 (1996-01-01), Kimura
patent: 5500623 (1996-03-01), Kimura
patent: 5512855 (1996-04-01), Kimura
patent: 5581211 (1996-12-01), Kimura
patent: 5604427 (1997-02-01), Kimura
patent: 5744999 (1998-04-01), Kim et al.
K. Kimura, "Low Temperature Coefficient CMOS Voltage Reference Circuits," IEICE Trans. Fundamentals, vol. E77-A, No. 2, Feb. 1994.

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