Agilent Technologies 93000 SOC Series Training Manual page 286

Lesson 7 – Executing the DAC Distortion Test
The I column shows the type and origin of the resulting
NFO
harmonic frequencies. The harmonics for two fundamentals are
calculated according to:
Abbrev. Meaning
F Fundamentals (generated
signal frequencies)
D 2 2nd order distortion
D 3 3rd order distortion
I 2 2nd order intermodulation
I 3 3rd order intermodulation
Harmonics Calculation for 2 Fundamentals
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Formula for 2 Fundamentals
F1 , F2
2 * F1 , 2 * F2
3 * F1 , 3 * F2
| F1 ± F2 |
| F1 ± 2 * F2 |, | 2 * F1 ± F2 |