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TECHNICAL PAPERS

Heterodyne Digital Control of a High-Frequency Micromechanical Oscillator

[+] Author and Article Information
Thomas E. Kriewall

 Intel Corporation, 2501 NW 229th Ave., Hillsboro, OR 97124thomas.e.kriewall@intel.com

Joseph L. Garbini

Department of Mechanical Engineering, University of Washington, Box 352600, Mechanical Engineering Building, Seattle, WA 98195garbini@u.washington.edu

John A. Sidles

Department of Orthopaedics, University of Washington, Box 352600, Mechanical Engineering Building, Seattle, WA 98195sidles@u.washington.edu

Jonathan P. Jacky

Department of Orthopaedics, University of Washington, Box 352600, Mechanical Engineering Building, Seattle, WA 98195jon@u.washington.edu

J. Dyn. Sys., Meas., Control 128(3), 577-583 (Oct 23, 2005) (7 pages) doi:10.1115/1.2229258 History: Received January 26, 2005; Revised October 23, 2005

In this paper we present heterodyne control as a technique for digital feedback control of a high-frequency, narrowband micromechanical oscillator. In this technique, isolated and synchronized hardware downconversion and upconversion components are used in conjunction with digital signal processing (DSP) to control the oscillator. Heterodyne control offers reduced computational effort for the digital control of high-frequency, narrow band system, the reduction of noise outside the pass-band, and the generation of lock-in amplifier signals. We present heterodyne control with design criteria in the context of magnetic resonance force microscopy (MRFM) cantilever control. Finally, we present experimental results of heterodyne control applied to an emulated radio-frequency microcantilever system.

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Copyright © 2006 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Downconversion block diagram

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Figure 2

Upconversion block diagram

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Figure 3

MRFM cantilever under conventional control

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Figure 4

MRFM cantilever under heterodyne control

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Figure 5

Cantilever with input upconverter and output downconverter for formulation of IF domain cantilever model

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Figure 6

IF frame cantilever root locus

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Figure 7

Intermediate frequency domain closed-loop system model

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Figure 8

Simulated open-loop controller frequency response

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Figure 9

Closed-loop root locus

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Figure 10

Phase correction scheme

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Figure 11

Simulated closed-loop frequency response error as a function of δω

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Figure 12

Larmor-frequency cantilever emulation

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Figure 13

Pentek digital signal processing system

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Figure 14

Closed-loop experimental results and theoretical predictions

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