Soft dB SPM PLL User Guide - Manual (Page 14)

SPM - PLL User’s Manual 14
Phase controller test interface (Resonator Phase Tab)
In the first tab (Resonator Phase Tab), the top curve presents the step response and the bottom curve
is the closed-loop frequency response of the derivative of the step response (i.e. the spectrum of the
closed-loop impulse response). This curve allows the evaluation of the controller bandwidth.
The second tab presents the excitation frequency response. This is the output of the phase controller. If
saturations appear on this curve it means that the output of the controller reaches the maximum or the
minimum of the operation range. If required, the operation range can be increased to avoid this non-
linear behaviour, or a smaller step excitation can be used to insure a linear behaviour.
4.8 Phase, Output Amplitude and Excitation Frequency Indicators
These indicators present: