THD Analysis

Thu Jun 10, 2010 9:42 am   

Dear All,

I am doing linearity analysis through the Fourier Analyzer component
of analogLib. After the analysis the results get written in
spectre.out file as below:



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=====================
Fourier Analysis `FA'
=====================

Fundamental frequency = 1 kHz.
Fundamental period = 1 ms.

Fourier components of V(a18) for the interval from 1 ms to 2 ms:
DC = 899.885 mV.

Harm: Absolute Absolute Relative Relative
Magnitude Phase Magnitude Phase
1: 739.851 mV -90.0827 Deg 0.000 dB 0 Deg <-
normalizer
2: 37.4673 uV 179.792 Deg -85.910 dB 269.875 Deg
3: 8.99541 mV -90.1928 Deg -38.302 dB -110.107 mDeg
4: 28.0017 uV -425.261 mDeg -88.439 dB 89.6574 Deg
5: 7.14442 mV 89.6791 Deg -40.304 dB 179.762 Deg
6: 15.4169 uV 179.322 Deg -93.623 dB 269.405 Deg
7: 4.87799 mV -90.4481 Deg -43.618 dB -365.424 mDeg
8: 3.29339 uV -1.24389 Deg -107.030 dB 88.8388 Deg
9: 2.64496 mV 89.4268 Deg -48.935 dB 179.509 Deg
10: 5.30079 uV -788.303 mDeg -102.896 dB 89.2944 Deg
11: 828.951 uV -90.688 Deg -59.012 dB -605.3 mDeg
12: 8.78719 uV 178.805 Deg -98.506 dB 268.888 Deg
13: 342.614 uV -90.8714 Deg -66.687 dB -788.678 mDeg
14: 7.47167 uV -1.59393 Deg -99.915 dB 88.4888 Deg
15: 835.565 uV 89.0308 Deg -58.943 dB 179.114 Deg
16: 3.18807 uV 177.568 Deg -107.312 dB 267.651 Deg
17: 785.723 uV -91.0857 Deg -59.478 dB -1.00297 Deg
18: 1.56208 uV 179.976 Deg -113.509 dB 270.059 Deg
19: 429.241 uV 88.8079 Deg -64.729 dB 178.891 Deg
20: 4.64 uV -1.68464 Deg -104.053 dB 88.3981 Deg
21: 14.3466 uV -90.392 Deg -94.248 dB -309.313 mDeg
22: 5.02109 uV 177.615 Deg -103.367 dB 267.698 Deg
23: 274.702 uV -91.5095 Deg -68.606 dB -1.42682 Deg
24: 3.01993 uV -3.49596 Deg -107.783 dB 86.5867 Deg
25: 358.535 uV 88.394 Deg -66.292 dB 178.477 Deg
Total harmonic distortion = 1.73757 % (-35.2012 dB).
RMS value of computed spectrum (excluding DC) = 739.963 mV.
RMS value of computed spectrum (including DC) = 1.16505 V.
Nonperiodicity (first/last point mismatch) = -33.8149 nV (-4.5705 u%).

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My question is: I want to access the value of Total harmonic
distortion through an OCEAN script. How can I do that? Does anybody
have ever worked with the Fourier Analyzer component?


Regards
Sam

Mon Jul 12, 2010 5:48 pm   

Samiran wrote, on 06/10/10 07:42:

Hi Sam,

There's a CCR, 725021, asking for just this. I don't think it's available right
now. The CCR is planned, but not released yet.

Regards,

Andrew.