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:
Sep. 27, 2005
Filed:
Jan. 29, 2001
Steven R. Ring, Bristol, GB;
Steven R. Ring, Bristol, GB;
Andrew Corporation, Orland Park, IL (US);
Abstract
The input and output of amplifier () are sampled and downconverted in frequency and filtered at (and) to produce sub-band signals. The input signal sub-band () is then subtracted from the output signal sub-band () at () to produce a residual signal () containing any distortion present in the sub-band selected by the downconversion oscillator (). Signal analyser () compares the input and output signal energy to deduce the amount of distortion in the output signal, to provide signals for controlling a distortion reduction mechanism such as a predistorter operating on amplifier (). Alternatively, the input signal sub-band () and the output signal sub-band () are Fourier transformed (and) to produce spectrums which can be analysed to determine the presence of distortion in the output of amplifier ().