Analog Devices,inc.

Analog Devices International Unlimited Company

Analog Devices Global

Alan Patrick Cahill

Colin Gerard Lyden

Eoin Edward English

Javier Calpe Maravilla

Mark Murphy

John Anthony Cleary

Gary Casey

Tudor M Vinereanu

Denis Martin O'Connor

Sharad Vijaykumar

Javier Calpe-Maravilla

Christian Jimenez

Michal Brychta

Sean B Brennan

Thomas F Roche

Techniques are provided for an integrated circuit, current loop interface that can receive and extract a high-frequency digital communication signal from a low-frequency analog current signal using a complex impedance circuit. The complex impedance circuit can allow for low input impedance at the lower frequencies of the analog current signal and high input impedance at the higher frequencies of the digital communication signal.

Communication receiver interface for current loop circuit

Embodiments of the present invention provide a motor-driven mechanical system with a detection system to measure properties of a back channel and derive oscillatory characteristics of the mechanical system. Uses of the detection system may include calculating the resonant frequency of the mechanical system and a threshold drive Drequired to move the mechanical system from the starting mechanical stop position. System manufacturers often do not know the resonant frequency and Dof their mechanical systems precisely. Therefore, the calculation of the specific mechanical system's resonant frequency and Drather than depending on the manufacturer's expected values improves precision in the mechanical system use. The backchannel calculations may be used either to replace or to improve corresponding pre-programmed values.

Control techniques for motor driven systems

A method and apparatus for automatic resonance detection is disclosed for a motor-driven mechanical system such as a voice coil motor (VCM) in which a resonance detector and driver are provided. The automatic resonance detector is implemented on the same integrated circuit as the driver, and dynamically determines the natural resonant frequency of the VCM driven by the driver. The resonant frequency is determined by measuring the back electromotive force (BEMF) of the VCM, detecting the slope of the BEMF signal, and determining the resonant frequency from the slope of the BEMF signal.

Control techniques for motor driven systems utilizing back-EMF measurement techniques

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Edinburgh, United Kingdom

Alan Patrick Cahill