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Digital feedback control loops for scanning tunneling microscopes

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2 Author(s)
Morgan, B.A. ; Electronics Technology Center, The Aerospace Corporation, El Segundo, California 90245 ; Stupian, G.W.

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Many circuit functions can now be realized using digital rather than analog techniques. The application of digital signal processing (DSP) technology for the implementation of the feedback control loop of a scanning tunneling microscope is discussed. A system that utilizes a commercially available PC AT‐compatible plug‐in card based on the Texas Instruments TMS320 series of digital processing chips to implement a loop controller of the proportional‐integral‐differential type is described. The advantages afforded by DSP in comparison to analog systems include greater flexibility in the choice of the signal processing algorithm and greater ease of control of loop parameters by the host computer.

Published in:

Review of Scientific Instruments  (Volume:62 ,  Issue: 12 )

Date of Publication:

Dec 1991

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