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. 19, 2021
Filed:
Dec. 10, 2019
Sumitomo Electric Industries, Ltd., Osaka, JP;
Tatsuya Hashinaga, Osaka, JP;
SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka, JP;
Abstract
A multistage amplifier includes: N amplifiers (N≥2), a (k+1)amplifier cascaded to a kamplifier (1≤k≤N−1), and each amplifier being configured to amplify a multicarrier signal; and an extraction circuit including an input and an output, the input being connected to an output of a jamplifier (1≤j≤N−1), and the output providing a compensation signal to an input of a (j+1)amplifier or an output of the (j+1)amplifier. The extraction circuit includes a filter circuit connected to the output of the jamplifier that extracts a distortion frequency component of n times a differential frequency f2−f1 (n≥1), a phase shifter cascaded to the filter circuit that shifts a phase of the component, and a gain adjustment circuit cascaded to the phase shifter that adjusts an amplitude of the component and generates the compensation signal.