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:
Feb. 12, 2002
Filed:
May. 22, 2000
Pekka Kangaslahti, Espoo, FI;
Sami Kalajo, Helsinki, FI;
Ylinen Electronics Oy, Kauniainen, FI;
Abstract
A predistortion linearizer circuit comprising an amplitude distorting part (AM/AM) and a phase distorting part (AM/PM). At least the phase distorting part (AM/PM) comprises broadband biasing means ( ) and a non-linear transmission line (L /D to L /D ) responsive to them. The biasing means ( ) are arranged to bias the non-linear transmission line (L /D to L /D ) to a substantially phase distorting area. The characteristics of the circuit can be changed by adjusting a biasing voltage (VB ) or by switching some of the diodes (D D ) inactive by activation signals (VA VA ). The amplitude distorting part (AM/AM) and the phase distorting part (AM/PM) can be similar in structure, but the diodes (D to D ) are partly forward-biased, whereby the losses caused by them decrease the amplitude of the signal.