G - Physics – 05 – F
Patent
G - Physics
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G05F 1/56 (2006.01) G05F 3/30 (2006.01)
Patent
CA 1043420
Application for Patent of Robert C. Dobkin for INPUT SUPPLY INDEPENDENT CIRCUIT ABSTRACT OF THE DISCLOSURE A circuit includes a plurality of transistors which are biased by a supply to provide an output which is independent of that supply and dependent only on the summation of the base- emitter voltages of the transistors, if any. A first pair of transistors are connected in series with one another between the supply and a second pair of transistors are connected in series with one another between the supply. The base-emitter junctions of the transistors are connected in a series loop, such that a voltage is developed between the base-emitter junc- tions of two adjacent transistors which is equal to the base- emitter voltage summation. The base-emitter voltages of any series connected transistors oppose one another in the series loop. Since the collector currents of the series connected transistors are equal to one another and their base-emitter voltages oppose one another in the series loop, the base-emitter voltage summation will be independent of collector currents and, therefore, independent of the input supply. The circuit can be employed as either a voltage or current regulator. As a regu- lator circuit, the emitter area of one transistor is different than the emitter area of another transistor, such that the sum- mation of the base-emitter voltages will be other than zero and independent of the input supply. The circuit can also be em- ployed as a buffer amplifier by making the emitter areas of the transistors equal to one another.
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