# Need help for ADS equation reprentation...

1. ## Need help for ADS equation reprentation...

I want to convert the output plot from dBm to mV

But I don't know how to express exponential equation in ADS as Eqn
I'd checked it out from ADS help, but only find the exp() ...

P[dBm] = 10*lg (Po[mW]/1mW]), & consider Lload=50-Ohm

For example: how can we express a^b in ADS Equation ?

Thanks !

This table shows the relationship between Power in [dBm] or [Watts] and Voltage in RMS, peak, peak-to-peak for sinusoidal signals in 50-Ohm systems. http://wera.cen.uni-hamburg.de/DBM.shtml

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2. ## Re: Need help for ADS equation reprentation...

Hi,

My hint:

dBm refers to 1mW.

Now you want to refer it to the voltage on a 50 Ohms resistor.

This leads to the question: How much voltage on a 50 Ohms resistor do you need to cause 1mW?

Klaus

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3. ## Re: Need help for ADS equation reprentation...

Originally Posted by coolpixs4
But I don't know how to express exponential equation in ADS as Eqn
I'd checked it out from ADS help, but only find the exp() ...
In ADS help, search for function dbmtov()

Originally Posted by coolpixs4
For example: how can we express a^b in ADS Equation ?
That is function pow()

You can find a list of functions here:
Help > Simulation > Equations and Expressions > Measurement Expressions

1 members found this post helpful.

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4. Originally Posted by volker@muehlhaus
In ADS help, search for function dbmtov()

That is function pow()

You can find a list of functions here:
Help > Simulation > Equations and Expressions > Measurement Expressions
You're so sweet, Thank you @volker. I got it.

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This might be help someone need for references: https://www.rfcafe.com/references/el.../pwr2volts.htm

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