TITLE

Wideband phase-locked loop circuit with real-time phase correction for frequency modulation atomic force microscopy

AUTHOR(S)
Fukuma, Takeshi; Yoshioka, Shunsuke; Asakawa, Hitoshi
PUB. DATE
July 2011
SOURCE
Review of Scientific Instruments;Jul2011, Vol. 82 Issue 7, p073707
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We have developed a wideband phase-locked loop (PLL) circuit with real-time phase correction for high-speed and accurate force measurements by frequency modulation atomic force microscopy (FM-AFM) in liquid. A high-speed operation of FM-AFM requires the use of a high frequency cantilever which, however, increases frequency-dependent phase delay caused by the signal delay within the cantilever excitation loop. Such phase delay leads to an error in the force measurements by FM-AFM especially with a low Q factor. Here, we present a method to compensate this phase delay in real time. Combined with a wideband PLL using a subtraction-based phase comparator, the method allows to perform an accurate and high-speed force measurement by FM-AFM. We demonstrate the improved performance by applying the developed PLL to three-dimensional force measurements at a mica/water interface.
ACCESSION #
63502309

 

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