Two Simple Constant Ic/Id,BJT/FET Measurement Circuits

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locky_z

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1. Constant Ic/Id but not constant Vce/Vds
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Bridge rectifier + constant current circuit is a bi-directional constant current source.
2. Constant Ic/Id and constant Vce/Vds
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Bridge rectifier + JFET also is a bi-directional constant current source.
The Vicomm of OP07 is Vee+2 ~ Vcc-1.5,So the bridge rectifier circuit on the right produces 1.4 and 4V voltage drops, in order to match the Vicomm range of the OP07.
The C1,C3,R2,R4 is the oscillation compensation circuit.
 

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