Reference circuit and method

Details Reference circuit and method Reference circuit and method

1997-08-15

1999-06-08

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

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

323907, 323314, G05F 320

Patent

active

059107260

ABSTRACT:
A reference circuit (200') has bipolar transistors (216, 226) providing a voltage difference .DELTA.V of base-emitter voltages .vertline.V.sub.BE .vertline. and has resistors (210/R.sub.1, 220/R.sub.2) for adding a current I.sub.R1 resulting from .DELTA.V and a current I.sub.R2 resulting from of base-emitter voltage .vertline.V.sub.BE .vertline. of one bipolar transistor (216 or 226) so that a resulting temperature coefficient TC.sub.TOTAL of said currents I.sub.R1 and I.sub.R2 is compensated. The circuit (200') has voltage transfer units (260, 270) which transfer .DELTA.V to the resistors (210/R.sub.1, 220/R.sub.2) so that the resistors (210/R.sub.1, 220/R.sub.2) do not substantially load the bipolar transistors (216, 226). The voltage transfer units (260, 270) have input stages with n-channel FETs. A control unit (241) which is coupled to the bipolar transistors (216, 226) adjusts input voltages (.vertline.V.sub.CE .vertline.) at the voltage transfer units (260, 270) to temperature changes, so that the n-channel FETs operate in an active region. The control unit (241) has a voltage source (290) providing a voltage V.sub.DS REF which is similary temperature and process depending as a drain-source voltage of the n-FETs.

REFERENCES:
patent: 4375595 (1983-03-01), Ulmer et al.
patent: 5424628 (1995-06-01), Nguyen
patent: 5479092 (1995-12-01), Pigott et al.
Motorola Technical Developments, "CMOS Bandgap circuit" by Andreas Rusznyak, vol. 30, pp. 101-103, Mar. 1997.
IEEE Journal of solid state circuits "A programmable CMOS dual channel interface processor for telecommunications applications", Bhupendra K. Ahuja, Paul R. Gray, Wayne M. Baxter and Gregory T. Uehara, vol. SC19, No. 6, Dec. 1984.
Song, B.S., Gray P.R. A precision curvature-compensated CMOS bandgap reference, IEEE Journal of solid state circuits, vol. SC-18, No. 6, Dec. 1983, pp. 634-643.
Horowitz P. Hill W., "The art of electronics", second edition, Cambridge University Press, chapter 6.15, Bandgap (V.sub.Be) reference, pp. 335-341, 1989.

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