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A system has the transfer function (1 – s)/ (1 + s). It is a—
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- non-minimum phase system
- minimum phase system
- low-pass system
- second order system
- non-minimum phase system
Correct Option: A
A system with
| T.F = | |
| T + s |
is a non-minimum phase system because a non-minimum phase system have at least one pole and/or zero in the R.H. side plane for nonminimum phase system as ω → ∞, phase angle φ ≠ – 90° (n – m). In this case, phase is – tan–1 ωT – tan–1 ωT
= – 2 tan–1 ωT = – 180° as ω → ∞.
