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From: Rick Lyons on 12 Sep 2006 06:28
On Thu, 24 Aug 2006 10:45:58 +0200, "Gery" <gery(a)ddd.com> wrote:

>Now I have a working MATLAB file that generates the same amplitude response:
>
>==============================================================
>
>OSR = 32768;
>
>fCLK = 9e6;
>Fs1 = fCLK/5;
>Fs2 = Fs1/OSR;
>Fs3 = Fs2/4;
>Fs4 = Fs3/2;
>
>f = linspace(0,240,10000);
>
>H1 = ( ( 1 - exp(1).^(-j*OSR*2*pi*f/Fs1) ) ./ ( OSR*(1 -
>exp(1).^(-j*2*pi*f/Fs1))) ).^4;
>H1_amp = 20*log10(abs(H1));
>H1_phase = unwrap(angle(H1))*180/pi;
>
>H2 = 0.5*(1 + exp(-j*2*pi*f/Fs3));
>H2_amp = 20*log10(abs(H2));
>H2_phase = unwrap(angle(H2))*180/pi;


(snipped)

Hi Gery,

Can you tell me how you determined
what expressions to use to define
H1 and H2?

Looking at the LTC2440 Data Sheet, I
didn't see any way to arrive at your
H1 and H2 expressions.

Thanks,
[-Rick-]

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