Soft-db SPM PLL User Guide Manuel d'utilisateur télécharger pdf (Page 9)

SPM - PLL User’s Manual

4 PLL User Interface

PLL interface: Main Tab

4.1 Phase Detector Time Cst (s)

This control adjusts the time constant of the phase detector. We suggest keeping time constant to 20us

(fast set-up), which allows a bandwidth of about 8 kHz. Note that the auto-adjustment functions for the

PI gains of both controllers (amplitude and phase) automatically set the time constant to 20us. This

way, the bandwidth of the controller is only limited by the PI gains and the LP filter.

4.2 Resonator Sweep

The Resonator Sweep button performs a frequency scan of the resonator. A sweep over a limited

frequency range is used to measure the frequency response. The following figure presents the

measurement interface:

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Soft-db SPM PLL User Guide Manuel d'utilisateur Page 9