- Divide Vin by Vref with a Divide block or a Gain block. The block output is Vin/Vref.
- Take the log of the output with a Log block. The block output is ln(Vin/Vref).
- Multiply by K with a Gain block. The block output is K*ln(Vin/Vref).
Logartihmic Amplifier in Simulink
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Daniel
2023-3-27
If you just want to implement this generically, it shouldn't be hard to build up from the mathematical definition.
If you want that to look pretty, you can package it in a subsystem, and perhaps create a mask to define K and Vref.
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Daniel
2023-3-28
You can use a Gain block in that case, which has one input and one parameter.
You can also use Constant blocks to create non-varying signals.
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