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Simulating basic Log Amplifier and Antilog Amplifier using diode as well as transistor

Pavan Garate
I'm learning the basics of Cadence OrCAD 16.6 Lite. I want to design and simulate the basic Log Amplifier and Antilog Amplifier circuits both using diode as well as transistor. I'm able to design these circuits. What values should be provided to the diode and transistor? In order to verify the simulation output, I have to calculate the output voltage theoretically, which needs the values of saturation currents for the diode and transistor. How to find these values? I have used the component DIODE from DISCRETE library and NPN BCE from TRANSISTOR library. Also tell me if I have chosen the correct components or not.
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  • The attached contains a couple of trivial samples for LOG based on a quick web search. Start an Analog / Mixed AD project and use parts from the EVAL library for the Lite version, parts from other libraries will likely not be suitable for simulation. A DC Sweep for V3 of 0 to 30u at 1u per step will sweep the input voltage. You will need to check the datasheets for the respective components to get the actual device parameters to evaluate the expected behaviour.

    logAmp.zip
Reply

  • The attached contains a couple of trivial samples for LOG based on a quick web search. Start an Analog / Mixed AD project and use parts from the EVAL library for the Lite version, parts from other libraries will likely not be suitable for simulation. A DC Sweep for V3 of 0 to 30u at 1u per step will sweep the input voltage. You will need to check the datasheets for the respective components to get the actual device parameters to evaluate the expected behaviour.

    logAmp.zip
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