User guide

Open Source SPM Controller & PLL

Model Mk3-PLL

The Open Source SPM Controller & PLL can be used as:

a SPM controller

a controller with an embedded PLL, or

a stand alone PLL

This MK3-PLL model is fully compatible with the SPM control software

developed by the GXSM Group. This model has more computational power and

memory than the MK2-A810 model for further developments and improvements

of the next generation of the GXSM control code.

One of the great innovation of this model is an embedded PLL function.

KEY FEATURES OF THE PLL MODULE

This highly optimized software PLL module is based on an innovative

phase/amplitude detector. This module is embedded in the SPM controller

firmware code.

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“Si(111)-7x7 reconstruction

Image provided by, D.v.Vörden,

M.Lange and R. Möller”

“Ultrathin Bi(111) ﬁlm on

a Si(111)-7x7 substrate

Images provided by, C.A. Bobisch,

M.C. Cottin, J. Schaffert and R. Möller”

“Schematic Diagram

of the PLL”

The analog I/O board of this SPM controller Mk3-PLL model also includes a TCXO (temperature compensated crystal

oscillator), which greatly improves the PLL’s thermal stability and reduces its noise at low frequencies.

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Open Source SPM Controller & PLL Model Mk3-PLL The Open Source SPM Controller & PLL can be used as: ü a SPM controller ü a controller with an embedded PLL, or ü a stand alone PLL This MK3-PLL model is fully compatible with the SPM control software developed by the GXSM Group. This model has more computational power and memory than the MK2-A810 model for further developments and improvements of the next generation of the GXSM control code.
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Key Features of the PLL Module • The PLL module is based on an innovative (patent-pending) phase/amplitude measurement technique. This technique does not rely on narrow-band filtering like traditional demodulation techniques. The result is signal capture and tracking capabilities that encompass the whole frequency range, with better noise and precision/time-constant trade-offs that are independent of frequency range. • Allows the control of both the phase and amplitude of the resonator signal.
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Open Source SPM Controller & PLL Model Mk3-PLL PLL MODULE SPECIFICATIONS Input Range ± 10 V Output Range ± 10 V (external 1/100 and 1/1000 attenuators provided) Frequency Range 3.2 kHz to 75 kHz Resonator Test Board An active resonator board is included with the SPM controller for easy testing and setup of the PLL module PLL Output Signal Ranges (Stand-Alone Operation) Excitation Frequency Excitation Amplitude Resonator Phase Resonator Amplitude ± 2.85 mHz ± 1.19 μV ± 6.83 μ degree ± 1.