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:
Oct. 24, 2017
Filed:
Mar. 30, 2015
Qualcomm Incorporated, San Diego, CA (US);
Jingxue Lu, San Diego, CA (US);
QUALCOMM Incorporated, San Diego, CA (US);
Abstract
Embodiments contained in the disclosure provide a method of cancelling power supply noise that affects the output of a class-D audio amplifier. The method begins when an alternating current (AC) coupled signal is input into an inverting amplifier. That signal is then amplified in the inverting amplifier. The amplified AC coupled signal is then feed through a resistor capacitor (RC) network, and from the RC network to an inverting input of the inverting amplifier. The output of a high pass filter is used to cancel the power supply ripple signal as the output of the high pass filter is injected into a supply voltage line. The cancelling signal is opposite in magnitude to the power supply ripple signal. The apparatus includes an inverting amplifier, a capacitor for coupling to an AC signal, and a resistor, in combination with the capacitor.