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. 27, 2008
Filed:
Jul. 09, 2002
James C. Strickland, Mesa, AZ (US);
Carlos A. Castrejon, Phoenix, AZ (US);
James C. Strickland, Mesa, AZ (US);
Carlos A. Castrejon, Phoenix, AZ (US);
Rockford Corporation, Tempe, AZ (US);
Abstract
An improved Class BD amplifier provides an amplified output signal by pulse width modulation techniques by sampling a carrier wave, usually a triangular or saw tooth waveform, according to an input signal to be amplified, as in a conventional class D amplifier. The resulting sampling waveform controls the connectivity of the potential suppliesto the power railsvia the first switchso that a first potential and a second potential are alternately supplied to the first power railand so that a third potential and fourth potential are alternately supplied to the second power railAs shown in FIG.the first potential is positive, the second and third potentials are at ground, and the fourth potential is negative. In addition, a constant potential difference is maintained between the first and second power railsThe power rails are alternately connected to a Class AD output stageby another switchthe connectivity of which is controlled by a second sampling waveform, PWM. This second sampling waveform PWMmay also be derived by sampling a triangular or saw tooth carrier wave by the input signal.