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Re: Using BV exp(), log() for numerical compression ,wrong result ?


 

You know, if my window could tolerate a swing of 100, this method will help avoiding ruin my window. Since the swing could minimize from 1Mega to thirteen degree.
Wouldn't you like to know the answer, possible or impossible ?

Or still the old problem, LTspice could see the complex (imaginary) part. Which does exist in the real world.

Best regards.

---In LTspice@..., <ericsson.sunshine@...> wrote :

Hi, :

Please help, do you know how much powerful this will help, it could minimize the numerical value from 120dB to number '13.8155'. Which help to plot/sketch them in a single graph. Where stores much info and without distort it.

thank you very much.

---In LTspice@..., <ericsson.sunshine@...> wrote :

Hi, :


While I am thinking using a mathematical compression (limit the numerical values to a scaled range, then revert them) algorithm, I found that in the BV device, the exp(), log() (natural algorithm) couldn't work as expect, normally I wish to use the math equation, x = log ( exp(x) ) or x = exp( log(x) ), but the waveform output disappointed me, the result from BV makes the 'x ' won't be the source of the signal.


Does anyone know why ? Can it be fixed ? Do I need any bias in LTspice ? I pretty sure some tools didn't need bias.


I have uploaded a file '20181126_20181126_BV_exp_log_convert.zip' at the temp folder.


Thank you very much.


Best regards.

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