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. 01, 2018
Filed:
Jun. 27, 2016
Applicant:
Dialog Semiconductor (Uk) Limited, London, GB;
Inventors:
Assignee:
Dialog Semiconductor (UK) Limited, London, GB;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03F 3/45 (2006.01); H03F 3/185 (2006.01); H03F 3/217 (2006.01);
U.S. Cl.
CPC ...
H03F 3/45932 (2013.01); H03F 3/185 (2013.01); H03F 3/2173 (2013.01); H03F 2200/171 (2013.01); H03F 2200/351 (2013.01); H03F 2200/462 (2013.01); H03F 2200/481 (2013.01);
Abstract
A system is disclosed which allows for canceling high frequency rail to rail common mode swing at pulse-width modulation (PWM) frequency for a Class-D, H and G audio amplifier or a Linear Resonance Actuator (LRA) driver. This allows wide bandwidth current sensing without the need of external components, or large on-chip resistor-capacitor (RC) networks, facilitating integration of the sense resistor. In addition, the sense amplifier DC input common mode and audio band common mode swing is reduced, allowing a sense resistor high frequency common mode swing of a least twice the MOSFET gate break down voltages.