[SI-LIST] target impedance profile
- From: "ZHENGGANG CHENG" <zhenggang.cheng@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Sat, 24 May 2008 14:27:03 -0700
Hi all,
It seems many SI engineers are using the method described below to define
the target impedance profile for PSD:
Z(f) = 0.05*V_DC/I(f) or Z_target=0.05*V_DC/Imax(f)
Z(f)---target impedance profile at freq f;
Z_target---target impedanace at all freq;
0.05---allowed tolerance;
V_DC---power raill;
I(f) ---current profile;
Imax(f)---max I(f)---generallt 0.5Imax(t).
But this setup does not guarantee the overall noise is 5%. All it does is
making sure noise at each of the frequency of interest is less than 5%. In
time domain, the combined content has the possibility of bigger than 5%.
So is there a better way to define target impedance profile?
Thanks,
Zhenggang Cheng
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