Help me in frequency response

[coolstuff07]

Hello,

Please any one explain in an opamp how you are saying that at any given node poles and zeros are in left half or right half plan.

Bye.

 

[aibrahim]

hello,

you can recognize that from plotting frequency responce magnitude and phase for pole in RHP( right half plane) you reconize increase in phase for pole in LHP (you recognize decrease in phase.
and the opposite case for zeros.

Best Regards,

 

[LvW]

Hello,

Please any one explain in an opamp how you are saying that at any given node poles and zeros are in left half or right half plan.
Bye.

The answer is easy and logical:
1.) Left hand plane means: Real part of s has negative sign (real part is σ)
2.) This parameter σ appears as a factor of time t in the time domain solution (step response) in the exponent of an e-function. This is the interesting property of system theory and gives the relation between time and frequency domain.
3.) Now: This factor σ.t must be negative for a decreasing step response, which is the definition of a stable system. Otherwise the step response would continuolsly rise (unstable).