Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1990-09-19
1991-10-22
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
3072968, 307491, 307240, 323314, H03K 301, H03K 1756
Patent
active
050598201
ABSTRACT:
Time multiplexing two or more current sources to source current to a single bipolar transistor achieves a more stable Vbe input for a switched capacitor bandgap reference circuit. With the proper selection of switched capacitor sizes and current sources values to establish a Vbe voltage at the input of a differential amplifier, an output reference voltage can be achieved that is substantially independent of processing and temperature variations as well as circuit aging characteristics. The invention reduces, and in some cases, eliminates the need for trimming values of capacitance or resistance to achieve the desired output reference voltage.
REFERENCES:
patent: 3976896 (1976-08-01), Ryder
patent: 4355285 (1982-10-01), Kelley et al.
patent: 4375595 (1983-03-01), Ulmer et al.
patent: 4714843 (1987-12-01), Smith
patent: 4742292 (1988-05-01), Hoffman
patent: 4902959 (1990-02-01), Brokaw
"A Precision Curvature-Compensated CMOS Bandgap Reference", IEEE Journal of Solid State Circuits, vol. SC-18, No. 6, Dec. 1983, pp. 634-643.
King Robert L.
Miller Stanley D.
Motorola Inc.
Roseen Richard
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