Noise Generator and Distortion Simulator SMIQ
1125.5555.03 2.390 E-9
2.24.4 Calculation of the Distortion Characteristic from Polynomial
Equations
A characteristic can be defined by entering polynomial coefficients in submenu POLYNOMIAL instead of
transferring reference values via the IEC/IEEE bus. The characteristic is calculated and loaded from the
four polynomial coefficients for AM-AM and AM-PM using the equations specified under section 2.24.1.
An IEC/IEEE-bus transfer is not required in this case.
It is possible to compensate the distortion of an amplifier connected after the SMIQ using the INVERSE
FUNCTION.
The characteristic entered via polynomial coefficients should be identical to the distortion characteristic
of the amplifier.
The level correction described in section 2.24.3 can be directly entered in the POLYNOMIAL menu. If
the polynomial is activated, this value can be displayed and set in the NOISE/DIST menu under LEVEL
CORRECTION. The determination by measurement of the level correction is performed as described in
section 2.24.3.
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