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. 13, 2008
Filed:
Dec. 15, 2006
Bin Xu, Cupertino, CA (US);
Bin Xu, Cupertino, CA (US);
Other;
Abstract
An ADC and method comprises a hybrid-type sigma-delta modulator comprising a digital delta-stage and an analog sigma-stage, wherein the analog sigma-stage comprises an analog low-pass filter adapted to only pass a low frequency audio band between 0-20 khz of a PWM wave, and wherein the digital delta-stage comprises a PWM wave generator; a pair of MOSFETs; and a power supply unit outputting voltage to the pair of MOSFETs. The ADC comprises a comparator attached to the hybrid-type sigma-delta modulator; a low-pass filter configured in a digital domain and for receiving a signal output of the comparator and remove high-frequency components of the comparator output above the audio band; a PWM back converter adapted to receive the filtered signal output and translate the digital low-pass filtered signal output to a power supply transient value in a digital format; and a dither signal source for injecting a dither signal to the digital delta-stage.