Apparatus for generating a current varying with temperature

Details Apparatus for generating a current varying with temperature Apparatus for generating a current varying with temperature

1975-11-13

1977-06-14

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307297, 307310, 307299A, 323 9, H03K 100, H01V 300, H01L 3500

Patent

active

040299740

ABSTRACT:
A digital-to-analog converter of the type formed with a plurality of current source transistors arranged to carry different levels of current according to a predetermined weighting pattern, e.g., a binary weighting pattern. In the converter, a plurality of identically sized current source transistors carry the different levels of current and thus operate at different current densities with different base-to-emitter voltages subject to temperature drift. Stable emitter voltages, providing accurate levels of weighted current, are developed by means of resistances between the bases of successive current source transistors and a current source for developing across the interbase resistances a voltage linearly varying with absolute temperature, corresponding to the difference between base-to-emitter voltages of the successive current source transistors.
The apparatus for generating a current linearly varying with absolute temperature is formed with first and second transistors forced to carry the same current at different current densities to produce different base-to-emitter voltages, and means such as an emitter resistor responsive to the difference in the base-to-emitter voltages for developing a current, corresponding to the difference in base-to-emitter voltages, which varies linearly with temperature.

REFERENCES:
patent: 3766543 (1973-10-01), Winkel et al.
patent: 3842412 (1974-10-01), Spofford, Jr.
patent: 3911353 (1975-10-01), DEPlassche

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