Apparatus and method for extending analog front end sense range of a high-Q MEMS sensor
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United States of America Patent
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Dec 5, 2017
Grant Date -
Sep 24, 2015
app pub date -
Mar 18, 2015
filing date -
Mar 18, 2014
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Abstract
Apparatus and methods for interfacing with a micro-electromechanical system (MEMS) sensor are provided. In an example, an apparatus can interface circuit including an integrator circuit, a sample switch circuit, a saturation detector and a controller. The saturation detector can be configured to receive a signal indicative of an integration of charge of the sensor, to compare the signal indicative of the integration of charge to an integrator saturation threshold and to modulate a divide parameter using the comparison of the signal indicative of the integration of charge and the integrator saturation threshold. The controller can be configured to receive a clock signal and to control the sample switch circuit based on a phase of the clock signal and the divide parameter.
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