Two Lags in Series - Answers

What is the relationship between the Amplitude Ratios and Phase Angles for the two lags when separate and when they are joined in series?

When two lags are joined in series:

• The amplitude ratio is equal to the product of the amplitude ratios for the two separate lags
• AR_{1 and 2 in series} = AR₁ * AR₂

• The phase angle is equal to the sum of the phase angles for the two separate lags
• PA_{1 and 2 in series} = PA₁ + PA₂

What value does the Phase Angle approach with two lags in series?

As expected the phase angle approaches -180 for two lags in series

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