Voltage controllable current source
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United States of America Patent
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Dec 5, 1989
Grant Date -
N/A
app pub date -
Apr 26, 1989
filing date -
Apr 26, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In the voltage controlled current source disclosed herein, temperature compensation is provided by offsetting base emitter voltage drops in a pair of bipolar transistors of complementary conductivity types. The control voltage is applied through a resistor to the emitter of a first transistor connected in common base mode. The base voltage of the first transistor is obtained from the emitter of a transistor of complementary conductivity type, the base of which is connected to a stable voltage source. The collector current of the first transistor is then applied to a current mirror to obtain an output current which is highly proportional to the control voltage.
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