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:
Aug. 05, 2008
Filed:
Mar. 20, 2007
Brian B. North, Los Gatos, CA (US);
Brian B. North, Los Gatos, CA (US);
Leadis Technology, Inc., Sunnyvale, CA (US);
Abstract
An improved Class G type amplifier which switches between multiple power rails depending upon the instantaneous amplitude of the input signal versus the power rails. The low voltage (inner) amplifier includes a plurality of parallel amplifier devices, and the high voltage (outer) amplifier includes a plurality of parallel amplifier devices. A plurality of switches each couples the input signal to either a respective one of the inner amplifier devices or a respective one of the outer amplifier devices. The switches are activated sequentially, such that the switching from inner to outer amplifier devices or vice versa is staggered over some period of time. This avoids having a single, large glitch in the output, and spreads multiple smaller glitches over enough time that some of the glitch energy can fall within the frequency range where the amplifier's feedback circuitry can eliminate its noise. The switches are sequentially activated by a series of delay elements.