Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1997-02-28
1998-09-15
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327540, 327541, 327543, H03H 304
Patent
active
058085076
ABSTRACT:
A reference voltage source comprises a first current branch (16, 36) and a second current branch (30, 34, 12). The voltage on a first terminal (6) in the first current branch (16, 26) is one junction voltage higher than the voltage on a second terminal (8) in the second current branch (30, 34, 12) owing to the presence of a transistor (80). The ratio between the current I.sub.1 through the first current branch (16, 36) and the current I.sub.2 through the second current branch (30, 34, 12) is thus determined by two non-linear characteristics having opposite temperature coefficients. A reference voltage (v.sub.z) with a small temperature coefficient and with a value which can be chosen freely can be generated by an appropriate choice of the resistance values for the resistors (58, 30, 16, 12) and by scaling the emitter areas of the transistors (34, 36, 70, 80).
REFERENCES:
patent: 3979610 (1976-09-01), Gordon
patent: 4309627 (1982-01-01), Tabata
patent: 5038053 (1991-08-01), Djenguerian et al.
patent: 5198701 (1993-03-01), Davies et al.
patent: 5357149 (1994-10-01), Kimura
"A Precision Reference Voltage Source", Karel E. Kuijk, IEEE Journal of Solid State Circuits, vol., SC8, No.3, Jun. 1973.
Halberstadt Johan C.
Janssen Hendrikus J.
Melse Abraham L.
Callahan Timothy P.
Franzblau Bernard
Luu An T.
U.S. Philips Corporation
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