Electricity: power supply or regulation systems – Self-regulating – Using a three or more terminal semiconductive device as the...
Patent
1997-08-11
1998-11-10
Berhane, Adolf
Electricity: power supply or regulation systems
Self-regulating
Using a three or more terminal semiconductive device as the...
323907, 327539, G05F 316
Patent
active
058349260
ABSTRACT:
In a bandgap reference circuit (200), a base-emitter voltage V.sub.BE with a first temperature coefficient TC.sub.1 is added to a voltage difference .DELTA.V with a second, opposite temperature coefficient TC.sub.2 by two resistors (210,220). The bandgap reference circuit (200) comprises current sources (271-276) and bipolar transistors Q(1) to Q(K) (281-286) of pnp-type and npn-type. Current densities in Q(1) to Q(6) are distributed so that some base-emitter voltages V.sub.BEk in Q(1) to Q(6) are different. The bases and emitters of Q(1) to Q(6) are serially coupled so that pn-junctions are arranged in a alternative directions, thus adding only the differences of V.sub.BEk but not adding their absolute values. This feature makes the circuit (200) applicable in a low voltage environment. The ratio between the two resistors (210,220) can have a value which minimizes noise voltages V.sub.N so that external filtering capacitors are not required.
REFERENCES:
patent: 4375595 (1983-03-01), Ulmer et al.
patent: 4795961 (1989-01-01), Neidorff
patent: 4896094 (1990-01-01), Greaves et al.
patent: 4926138 (1990-05-01), Castello et al.
patent: 4939442 (1990-07-01), Carvajal et al.
patent: 4994729 (1991-02-01), Taylor
patent: 5391980 (1995-02-01), Thiel et al.
patent: 5453679 (1995-09-01), Rapp
patent: 5471131 (1995-11-01), King et al.
patent: 5479091 (1995-12-01), Chlovper
patent: 5563504 (1996-10-01), Gilbert et al.
patent: 5629612 (1997-05-01), Schaffer
Motorola Technical Developments, "CMOS Bandgap circuit" by Andreas Rusznyak, vol. 30, pp. 101-103 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 pp. 870-899.
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 1980.
Berhane Adolf
Handy Robert M.
Motorola Inc.
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