- Title
- Direct design of closed-loop demodulators for amplitude modulation atomic force microscopy
- Creator
- Ruppert, Michael G.; Harcombe, David M.; Moore, Steven I.; Fleming, Andrew J.
- Relation
- 2018 Annual American Control Conference (ACC). Proceedings of the ACC2018: 2018 Annual American Control Conference (Milwaukee, WI 27-29 June, 2018) p. 4336-4341
- Publisher Link
- http://dx.doi.org/10.23919/ACC.2018.8430896
- Publisher
- Institute of Electrical and Electronics Engineers (IEEE)
- Resource Type
- conference paper
- Date
- 2018
- Description
- A fundamental component of the z-axis feedback loop in amplitude modulation atomic force microscopy is the demodulator. It dictates both bandwidth and noise in the amplitude and phase estimate of the cantilever deflection signal. In this paper, we derive a linear time-invariant model of a closed-loop demodulator with user definable tracking bandwidth and sensitivity to other frequency components. A direct demodulator design method is proposed based on the reformulation of the Lyapunov filter as a modulated-demodulated controller in closed loop with a unity plant. Simulation and experimental results for a higher order Lyapunov filter as well as Butterworth and Chebyshev type demodulators are presented.
- Subject
- demodulation; bandwidth; transfer functions; frequency modulation; sensitivity; filtering theory; Chebyshev approximation
- Identifier
- http://hdl.handle.net/1959.13/1392163
- Identifier
- uon:33360
- Identifier
- ISBN:9781538654286
- Rights
- © 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
- Language
- eng
- Full Text
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