Current source circuit
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United States of America Patent
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Jun 7, 1994
Grant Date -
N/A
app pub date -
Nov 14, 1992
filing date -
Feb 12, 1992
priority date (Note) -
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status (Latency Note)
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Abstract
A current source consists of a transistor having an emitting electrode connected to one end of a first resistor and a first operational amplifier that compares the voltage of the emitting electrode with a control voltage and controls a control electrode of the transistor through a second resistor. The voltage at the emitting electrode of the transistor is kept at a predetermined voltage by a second operational amplifier that compares the voltage at the emitting electrode with the predetermined voltage and controls the voltage at the other end of the first resistor. The control voltage source has a known source resistance. A third resistor is inserted between the non-inverting input and output terminals of the first operational amplifier. The second operational amplifier serves to make the maximum output voltage at the collecting electrode of the transistor high so that a power voltage usage efficiency of an electronic load is improved. The second resistor detects as a voltage the current of the control electrode or the base of the transistor and the detected voltage is applied to the first operational amplifier via a divider network comprising an appropriate ratio of the source resistance and third resistor so as to compensate an error in the output current.
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