Designing a 0-20uA High Precision Voltage to Current Converter Circuit

The discussion focuses on designing a high precision voltage-to-current converter circuit with an output current range of 0-20µA, intended to replace photodiode sensors in a position control application. The user requires a voltage-controlled current sink or source to simulate photodiode outputs for testing purposes. Suggested solutions include constant current source circuits and voltage-controlled current sink designs using operational amplifiers. Key advice highlights using the MC33172 dual op-amp for implementing two current sources, with attention to input offset voltage (approximately 2.0mV) and component selection based on the input voltage range (assumed 0-2V). Reference circuits and simulation tools were provided to aid design and verification. Offset compensation may be necessary if operating near the 20nA resolution level.
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