Digital Q control for enhanced measurement capability in cantilever-based instruments
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United States of America Patent
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Oct 25, 2011
Grant Date -
Oct 9, 2008
app pub date -
Jun 17, 2008
filing date -
Aug 25, 2003
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Abstract
A digital system for controlling the quality factor in a resonant device. The resonant device can be any mechanically driven resonant device, but more particularly can be a device that includes a cantilever within its system, such as an atomic force microscope. The quality factor can be digitally controlled to avoid noise effect in the analog components. One of the controls can use a direct digital synthesizer implemented in a way that provides access to the output of the phase accumulator. That output is a number which usually drives eight lookup table to produce a cosine or sign output wave. The output wave is created, but the number is also adjusted to form a second number of the drives a second lookup table to create an adjustment factor. The adjustment factor is used to adjusts the output from the cosine table, to create an adjusted digital signal. The adjusted digital signal than drives a DA converter which produces an output drive for the cantilever.
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