Miscellaneous active electrical nonlinear devices – circuits – and – External effect – Temperature
Patent
1993-08-05
1996-08-13
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
External effect
Temperature
327513, 327509, 327514, 327538, 307650, 323315, H03K 1700
Patent
active
055460410
ABSTRACT:
A circuit for sensing a parameter, such as temperature, has a single current source and a mismatched differential pair for providing two different currents at a desired current ratio. Each current is provided to a current control element and a sensing element, each of which may be diodes. An operational amplifier closes the loop and feeds back a signal from the input of the current control elements to the differential pair to hold the desired current ratio constant. Chopper circuitry is employed with the amplifier to reduce the offset and low frequency noise contribution of the amplifier.
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An Integrated Micropower Low-Voltage Temperature-Controlled Oscillator, David Van Maaren, Jan Klijn, and Gerard C. M. Meijer, IEEE Journal of Solid-State Circuits, vol. SC-17, No. 6, pp. 1197-1201, Dec. 1982.
Callahan Timothy P.
Le Dinh T.
Massachusetts Institute of Technology
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