Digital linearization and cancellation of capacitive coupling for a scanning tunneling microscope
作者:
Bruno Paillard,
Ran Tang,
Paul Rowntree,
期刊:
Review of Scientific Instruments
(AIP Available online 1998)
卷期:
Volume 69,
issue 4
页码: 1770-1780
ISSN:0034-6748
年代: 1998
DOI:10.1063/1.1148840
出版商: AIP
数据来源: AIP
摘要:
This article describes the development and test of a digital control loop, to control the tip-to-specimen distance in a scanning tunneling microscope. This digital controller performs a frequency-independent linearization of the gap-to-current relationship, as well as the compensation of the undesirable capacitive coupling between the electrodes of the scan tube and the input of the current-to-voltage converter, two difficulties normally associated with analog controllers. In the described work, the control loop is implemented on an inexpensive fixed-point DSP, processing the signals at a 25 kHz sampling rate. ©1998 American Institute of Physics.
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