The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 07, 2013
Filed:
Jul. 12, 2012
Sang Ton Ngo, San Jose, CA (US);
Thomas O'brien, Powell, OH (US);
Sridhar Kotikalapoodi, Santa Clara, CA (US);
M Abid Hussain, Los Altos, CA (US);
Sang Ton Ngo, San Jose, CA (US);
Thomas O'Brien, Powell, OH (US);
Sridhar Kotikalapoodi, Santa Clara, CA (US);
M Abid Hussain, Los Altos, CA (US);
Qualcomm Incorporated, San Diego, CA (US);
Abstract
Embodiments of the present invention include circuits and methods for calibrating position displacement in a voltage controlled actuator. In one embodiment, a calibration circuit comprises an actuator having a control terminal for receiving a programmable control voltage to set a displacement, a switch that selectively decouples said programmable voltage from said control terminal and couples a reference current to said control terminal when the control terminal is decoupled from said control voltage, a comparator that senses a voltage difference between said control voltage and said control terminal, and a timer coupled to an output of the comparator. The timer measures a time period required to increase the control terminal voltage. The capacitance of the actuator may be determined and used to calibrate the position of the actuator.