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, 2000
Filed:
Mar. 23, 1998
Pallab Midya, Schamburg, IL (US);
Ronald Gene Myers, Scottsdale, AZ (US);
Motorola, Inc., Schamburg, IL (US);
Abstract
A radio frequency EER-type power amplifier is described in which pulse width modulation is utilized. Input rf signals are split into phase and amplitude paths by a delay line (210). The phase path is coupled to a power amplifier (260). The amplitude path includes an envelope detector (220) coupled to a class S amplifier (270). The class S amplifier is coupled to the power amplifier (260) via a transmission line implemented low pass filter (290). The low pass filter uses strip line transmission lines (410, 510) which may utilize magnetic material (520, 720) to enhance the operation of the low pass filter. The class S amplifier and a transmission line filter provide an amplified, high fidelity replica of the input rf signal.