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:
Jul. 26, 2016
Filed:
May. 16, 2014
Knowles Electronics, Llc, Itasca, IL (US);
Michael Jennings, Plano, TX (US);
Craig Stein, Naperville, IL (US);
Dean Badillo, New Lenox, IL (US);
KNOWLES ELECTRONICS, LLC, Itasca, IL (US);
Abstract
A buffer is coupled to an acoustic motor. The buffer has an input and an output. The input has an input voltage and the output has an output voltage. The buffer is coupled to a load. The buffer includes an input transistor and push-pull transistor circuitry. The input transistor has a gate, a source, and a drain, a gate-to-source capacitance, and an area. The push-pull transistor circuitry is coupled to the input transistor. Under a first set of operating conditions, the gate to source voltage of the input transistor remains constant and the output voltage is a buffered copy of the input voltage. Under a second set of operating conditions, the push-pull transistor circuitry selectively sinks or sources additional current to the load so that linearity of buffer operation is provided. A gate-to-drain capacitance of the input transistor is buffered allowing the area of the input transistor to be increased without reducing the gain of the motor.