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The transfer function of a compensating network is of the form
(1 + αTs) . (1 + Ts)
If this is a phase-lag network, the value of α should be
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- exactly equal to 0
- between 0 and 1
- exactly equal to 1
- greater than 1
Correct Option: B
The output leads the input by an angle
φ = tan– 1 T
If α is > 1 ; φ is positive and if 0 < α < 1, then output will lag the input by φ. Since the given function is to represent a phase lag network, α should be between 0 and 1.
