Switched capacitor temperature independent bandgap reference

Details Switched capacitor temperature independent bandgap reference Switched capacitor temperature independent bandgap reference

1981-02-03

1983-03-01

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307299A, 307310, 307490, 323314, H03K 301, H03K 326

Patent

active

043755950

ABSTRACT:
A temperature stable bandgap voltage reference source utilizing two substrate bipolar transistors biased at different emitter current densities is provided. Switched capacitors are used to input the V.sub.be and the .DELTA.V.sub.be of the transistors (NTC and PTC voltages, respectively) into an amplifier to provide a reference voltage proportional to the weighted sum of the PTC and NTC voltages. Proper selection of the ratio of the switched capacitors renders the reference voltage substantially independent of temperature. In a modified form of the reference, the reference amplifier is implemented by an auto-zeroed operational amplifier which uses switched capacitor techniques and an integrated capacitor to achieve the auto-zeroing function.

REFERENCES:
patent: 4071813 (1978-01-01), Dobkin
patent: 4210872 (1980-07-01), Gegorian
patent: 4249122 (1981-02-01), Widlar
patent: 4263519 (1981-04-01), Schade, Jr.
patent: 4287439 (1981-09-01), Leaschmer
patent: 4295089 (1981-10-01), Cooperman
patent: 4317054 (1982-02-01), Caruso et al.
patent: 4325018 (1982-04-01), Schade, Jr.
IEEE Journal of Solid State Circuits, "A Simple Three-Terminal IC Bandgap Reference", by A. P. Brokaw, vol. scq, No. 6, 12/74, pp. 388-393.
IEEE Journal of Solid State Circuits, "MOS Sampled Data Recursive Filters Using Switched Capacitor Integrators", by B. J. Hosticka et al., vol., SC12, No. 6, 12/77, pp. 600-604.
"Potential of MOS Technologies for Analog Integrated Circuits", Reprint IEEE Solid State Circuits, vol. SC13, pp. 285-295, 6/78 by Hodges.

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