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From: awesome2999 jacob on 14 Apr 2010 10:28
Hi there,

I am completely new to matlab and don't know how to draw a waveform of

matlab code
VT=0.0252;
vin=1.5+cos(2*pi*100*t);
R=2000;
Is = 1/10000000000000000;
t=linspace(0,0.03,1000);
Vout=-VT*log(vin/R*Is);
plot(t,Vout);

i don't know how to get the right answer because the Vout should be around 0.72 to .76
sinewave form
note: vin=1.5+cos(2*pi*100*t); means that peak value is 2.5 and lowest values is 0.5
which should be sub in Vout equations.

please help me to get the right code
thank-you for your help

cheers
From: Greg Heath on 15 Apr 2010 05:53
On Apr 14, 10:28 am, "awesome2999 jacob" <samnz2...(a)yahoo.co.nz>
wrote:
>  Hi there,
>
>  I am completely new to matlab and don't know how to draw a waveform of
>
> matlab code
> VT=0.0252;
> vin=1.5+cos(2*pi*100*t);
> R=2000;
> Is = 1/10000000000000000;
> t=linspace(0,0.03,1000);
> Vout=-VT*log(vin/R*Is);
> plot(t,Vout);
>
> i don't know how to get the right answer because the Vout should be around 0.72 to .76
> sinewave form
> note: vin=1.5+cos(2*pi*100*t); means that peak value is 2.5 and lowest values is 0.5
> which should be sub in Vout equations.
>
> please help me to get the right code
> thank-you for your help

1. What do the symbols VT, R and ls represent?
2. Why are you taking the log?
3. How can you define vin in terms of t before t is defined?

Greg
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