  In the current paper, we have developed an analytical apparatus, allowing to
calculate the phase error, produced by miscalibration of modulation parameters.
The case of harmonic modulation is considered, the analysis is performed for
cases of two parameters miscalibration: amplitude and start phase. Two
demodulation algorithms are considered: conventional 4-point algorithm, based
on ordinary least squares approach and previously developed 4+1 algorithm with
high immunity to phase error, induced by change of target phase on demodulation
interval. Predictions, given by developed analytical equations are verified by
means of numeric modeling.
