G - Physics – 05 – F
Patent
G - Physics
05
F
323/4
G05F 1/44 (2006.01) G05F 3/22 (2006.01)
Patent
CA 1133592
D-21,851 TEMPERATURE COMPENSATED CURRENT SOURCE by Tom L. Blackburn ABSTRACT OF THE DISCLOSURE An integrated current source comprising a plurality of NPN transistors and a discrete resistor having one side thereof electrically connected through a PNP transistor to a first DC supply voltage and through series connected base-emitter junction diodes of a prescribed number of ones of the NPN tran- sistors to a temperature stable DC supply voltage. The other side of the resistor is electrically connected to a temperature stable reference potential through series connected base-emitter junction diodes of the same prescribed number of others of the NPN tran- sistors, with the base-emitter junction diodes of one and other NPN transistors being poled in opposite directions. Each of the one transistors is also paired with an associated other transis- tor. Considering each pair individually, the transistors thereof are caused to pass collector currents of substantially the same values so that their base-emitter junction voltages are also substantially the same values. This causes the temperature stable supply voltage to be established across the resistor in order to set a reference current in it and one of the other transistors that is substantially constant and independent of temperature.
345276
Gte Automatic Electric Laboratories Incorporated
R. William Wray & Associates
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