公开(公告)号：US09726702B2

公开(公告)日：2017-08-08

申请号：US13626434

申请日：2012-09-25

Applicant: Analog Devices, Inc.

Inventor： Dermot O'Keeffe ,  Donal Bourke ,  David Harty ,  Tudor Vinereanu ,  Colin Lyden

IPC: G01R31/28 ,  H03F1/26 ,  H03B19/00 ,  G01R27/28

CPC classification number: G01R27/28

Abstract: A digital sine wave may be converted to an analog signal at a digital to analog converter (DAC). The converted analog signal may be supplied to a device and an analog return signal from the device may be passed through a relaxed anti-aliasing filter and converted to digital code words at an analog to digital converter (ADC). An impedance may be calculated from the results of a Fourier analysis of the digital code words. The ADC and DAC clock frequencies may be asynchronous, independently variable, and have a greatest common factor of 1. The clock frequencies of the ADC and/or DAC may be adjusted to change a location of images in the ADC spectrum. By using these different, adjustable clock frequencies for the ADC and the DAC, an analog signal may have increased aliasing without introducing signal errors at a frequency of interest.

公开(公告)号：US10025276B2

公开(公告)日：2018-07-17

申请号：US14303896

申请日：2014-06-13

Applicant: Analog Devices, Inc.

Inventor： Colin Lyden ,  Javier Calpe-Maravilla ,  Mark Murphy ,  Eoin English ,  Denis Martin O'Connor ,  Tudor Vinereanu ,  Alan Cahill ,  Sean Brennan

IPC: H02P5/00 ,  H02N2/00 ,  G05B11/01 ,  G05B13/00 ,  G05B11/32 ,  G05B13/02 ,  G05B5/01 ,  H02P25/034

Abstract: 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 DTH required to move the mechanical system from the starting mechanical stop position. System manufacturers often do not know the resonant frequency and DTH of their mechanical systems precisely. Therefore, the calculation of the specific mechanical system's resonant frequency and DTH rather 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.