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Precision variable current source question

Category: Hardware
Product Number: AD549

This circuit diagram is from Keithley's Model 220 programmable current source. Its principle is to generate a precise current source by applying an input voltage to the Rs resistor, leaving the current source over the load RL. The maximum voltage at both ends of RL is ± 125V. I have a few questions that I don't quite understand. Can you help me answer them?
1. The purpose of Part A is to establish frequency compensation for AD549, but I am not quite sure how it is established. How should it be analyzed?
2. How is the voltage of section B implemented as RL boost, with a voltage of ± 125 volts?
3. How is the connection between high voltage ground and low voltage ground established

sim_ltspice_model220.asc

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[edited by: Miaowazhongzi at 2:11 PM (GMT -4) on 16 Jul 2024]