The important figures of merit to the system in frequency domain are :

Stability in Frequency Domain topics include: Mathematical preliminaries, nyquist stability creation, closed loop frequency and time domain analysis. Stability in the frequency domain is a system's ability to remain stable when subjected to sinusoidal inputs of varying frequencies. A stable system is one that can maintain a steady-state output when subjected to such inputs.  Frequency stability is the degree to which an oscillating signal produces the same frequency for a specified interval of time. Some devices have good short-term stability while others have good long-term... Show more

Stability in Frequency Domain topics include: Mathematical preliminaries, nyquist stability creation, closed loop frequency and time domain analysis.

Stability in the frequency domain is a system's ability to remain stable when subjected to sinusoidal inputs of varying frequencies. A stable system is one that can maintain a steady-state output when subjected to such inputs. 

Frequency stability is the degree to which an oscillating signal produces the same frequency for a specified interval of time. Some devices have good short-term stability while others have good long-term stability. 
Frequency stability is affected by the amount of power system inertia, along with the response of controllable frequency reserves and the amount of power imbalance. 
 

Related Test: Control Systems Practice Test: Frequency Response Analysis

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