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An analysis of a scanning tunnelling microscope (STM) control system using root locus and Nichols' approaches is given. The response characteristic of the control loop, incorporating an integrator and a single-pole low-pass filter, is measured. Analysis shows that such a compensation scheme provides near optimal behaviour of the control loop and deals with mechanical resonance in a particularly satisfactory manner.
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Ping et al. (1993) studied this question.
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