- Title
- A high-bandwidth amplitude estimation technique for dynamic mode atomic force microscopy
- Creator
- Karvinen, K. S.; Moheimani, S. O. R.
- Relation
- Review of Scientific Instruments Vol. 85, Issue 2
- Publisher Link
- http://dx.doi.org/10.1063/1.4865841
- Publisher
- American Institute of Physics
- Resource Type
- journal article
- Date
- 2014
- Description
- While often overlooked, one of the prerequisites for high-speed amplitude modulation atomic force microscopy is a high-bandwidth amplitude estimation technique. Conventional techniques, such as RMS to DC conversion and the lock-in amplifier, have proven useful, but offer limited measurement bandwidth and are not suitable for high-speed imaging. Several groups have developed techniques, but many of these are either difficult to implement or lack robustness. In this contribution, we briefly outline existing amplitude estimation methods and propose a new high-bandwidth estimation technique, inspired by techniques employed in microwave and RF circuit design, which utilizes phase cancellation to significantly improve the performance of the lock-in amplifier. We conclude with the design and implementation of a custom circuit to experimentally demonstrate the improvements and discuss its application in high-speed and multifrequency atomic force microscopy.
- Subject
- amplifiers; atomic force microscopy; low pass filters; mixers; atomic force microscopes
- Identifier
- http://hdl.handle.net/1959.13/1067393
- Identifier
- uon:18397
- Identifier
- ISSN:0034-6748
- Language
- eng
- Full Text
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