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Introduction to Scanning Tunneling MicroscopySecond Edition$
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C. Julian Chen

Print publication date: 2007

Print ISBN-13: 9780199211500

Published to Oxford Scholarship Online: September 2007

DOI: 10.1093/acprof:oso/9780199211500.001.0001

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Electronics and Control

Electronics and Control

(p.283) Chapter 11 Electronics and Control
Introduction to Scanning Tunneling Microscopy

C. Julian Chen

Oxford University Press

This chapter discusses electronics and computer interfaces for STM and AFM. For STM, the detection of the minute tunneling current is of paramount importance. Thus, the basic concepts and analysis of the current amplifier, or more accurately speaking, the transimpedence amplifier, is discussed. It includes the typical circuits and an analysis of the gain, noise, frequency response, microphone effect due to the coaxial cable, and the logarithmic amplifier to make the distance dependence of the output signal linear. the feedback system is then discussed, including a typical circuit, as well as the analyses of the steady-state response and the transient response. Finally, the architecture of the computer interface system with the algorithm of automatic approaching is discussed.

Keywords:   tunneling current, current amplifier, transimpedence amplifier, gain, noise, frequency response, microphone effect, logarithmic amplifier, feedback system, steady-state response

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