G - Physics
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F
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G05F 1/56 (2006.01) G05F 3/26 (2006.01) H03F 3/347 (2006.01)
Patent
CA 1068336
Abstract A pair of similar conductivity transistors operated at substantially the same temperature T are connected as a current divider. A common terminal to which their emitter electrodes are each connected receives an input current to be apportioned between the emitter-to-collector paths of the transistors, these separate currents flowing to respective branch terminals at the respective collector electrodes of this transistor. The base electrodes of the transistors are connected to opposite ends of a resistive element. A current responsive to T is caused to flow through the resistive element to cause a potential drop substantially proportionally responsive to T between its opposite ends, biasing the transistors relative to each other so as to apportion the input current to the branch terminals in an invariant ratio. The means for developing the temperature responsive current may include a current regulator comprising a regenerative feedback loop connection of a pair of current amplifiers, one of which exhibits decreasing gain with increased level of current supplied to its input circuit.
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