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IEVref:561-03-15ID:
Language:enStatus: Standard
Term: linearity of frequency modulation deviation
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Definition: measure of the transfer characteristic of a modulation system as compared to an ideal (straight line) function, usually expressed as an allowable non-linearity in per cent of the specified full range deviation

Note 1 to entry: Modulation linearity can also be expressed in terms of the permissible distortion of base-band signals produced by the modulation device (for example, intermodulation and harmonic distortion products shall not exceed –40 dB relative to the total modulating signal power).

Note 2 to entry: Figureá19 is a plot of the output frequency of a typical modulated oscillator specified to have a modulation characteristic of 133,3 Hz/V over a range of ▒ 3 V, with an allowed non-linearity of ▒ 5 %. CurveáD is the actual characteristic compared with the ideal (curve A) and the limits (curves B and C).

Figure 19 – Typical frequency fluctuation characteristics


Publication date:2014-11
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Internal notes:2016-02-22: Figures replaced by newly generated smaller versions. JGO
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