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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-] |