Patent · US Expired

Harmonic suppression in dual band mobile phones

US6400963B1 · kind B1 · utility

111Cited by

3References

32Claims

0Family size

Assignee

Telefonaktiebolaget LM Ericsson (Publ) · SE

Inventors

Roman Glöckler · Achern, DE
Alexander Herold · Erlangen, DE
Paul David Johansson · Wellington, US

Key dates

Filing date	May 21, 1999
Grant date	Jun 4, 2002
Priority date	—
Expiry date	May 21, 2019

Classification

Technology area (CPC H)Electricity
CPC primaryH04B1/48
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

Abstract

To effectively suppress harmonics in a dual band mobile phone with a power amplifier (10) outputting transmitting signals for different frequency bands (GSM; PCS, DCS) via a single output as described a power amplifier output circuit in which harmonics are filtered through impedance transformation of a turn-off impedance of a transmitter/receiver change over unit (36, 38). Hereby the desired filtering of harmonics may be achieved without almost no additional expenditure.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.