For Electronics Oscillator Among, Phase noise and Amplitude noise, which noise level is greater when measure practically and theoretically for the following conditions:

1) If input signal amplitude is perturbed (by noise) and kept phase constant throughout time

*A(t) * COS(2*pi*f*t+phi)*

2) If input signal amplitude is constant throughout time and phase is perturbed (by noise)

*A * COS(2*pi*f*t+phi(t))*

*Consider any measurement system which is appropriate to measure both amplitude and phase noise*

*3) when Amplitude is perturbed at any time can phase noise is less compare to amplitude noise ? or in other words*

*can Phase be affected by amplitude perturbation?*