How to Connect and Switch Between Two Current Amplifiers?

[Stellad]

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

 

[Bob S]

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.

 

[oswaler]

Hello Stella,

Thank you for your question. To connect two current amplifiers, you can either connect them in series or in parallel. Connecting them in series means that the output of one amplifier is connected to the input of the other, essentially creating a chain. This will increase the overall gain of the two amplifiers. However, connecting them in parallel will allow the two amplifiers to work independently and the output will be the sum of the outputs of each amplifier.

In order to switch between the two amplifiers, you will need to use a switch or a multiplexer. This will allow you to select which amplifier's output you want to use at a given time. It is important to consider the specifications and compatibility of the amplifiers when connecting them in series or parallel, as well as the voltage and current requirements of your circuit.

I hope this helps and please let me know if you have any further questions.

Best,