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:
Jun. 07, 2016
Filed:
Mar. 03, 2014
Tdk Corporation, Tokyo, JP;
Dev V. Gupta, Concord, MA (US);
Zhiguo Lai, Acton, MA (US);
TDK Corporation, Tokyo, JP;
Abstract
A multi-stage signal handling circuit. Operating as a combiner or splitter, first stage transformers match low input impedance at a first set of differential terminals, and second stage transformers match expected higher impedance at second terminal(s). Transformer windings are mirror image, vertically aligned, meandering conductive tracks disposed on opposite sides of a PCB. Air columns above or below the conductive tracks reduce ground plane effects. A capacitor provided across the differential input terminals of each transformer is chosen to further match the power amplifier output, including consideration of inherent inductance presented by the circuit tracks and vias between transformer sections.