How to Connect and Switch Between Two Current Amplifiers?

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SUMMARY

This discussion focuses on connecting two current amplifiers simultaneously and switching between them. Stella provides an LTSpice circuit diagram featuring two operational amplifiers connected in series to a single floating current source set at 1 microamp DC. The analysis reveals that Vout1 is +0.1 volts and Vout2 is -0.1 volts, with the option to use a unity gain inverter to invert either voltage output. The feedback resistor for each op amp can be adjusted independently, provided the output remains within +/- 10 volts.

PREREQUISITES
  • Understanding of operational amplifiers and their configurations
  • Familiarity with LTSpice simulation software
  • Knowledge of feedback resistor effects in amplifier circuits
  • Basic principles of current sources and voltage outputs
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  • Research the design and implementation of unity gain inverters
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Stellad
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Hello,

I want to connect 2 current amplifiers the same time and I want to be able to switch between them. How should I connect them? in series?

Thanks in advance,
//Stella
 
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I attach an LTSpice circuit diagram (Fig 1) for two operational amplifiers, both simultaneously attached in series to a single floating current source. The current source is set to 1 microamp DC. Both op amps have a 100 kohm feedback resistor. The Spice DC operating point analysis (Fig 2) shows that Vout1 is +0.1 volts, and Vout2 is -0.1 volts. A unity gain inverter could be used to invert either voltage output. The feedback resistor in either op amp circuit can be changed without affecting the other circuit, unless either op amp output exceeds about +/- 10 volts.
 

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