公开(公告)号：EP2005601A1

公开(公告)日：2008-12-24

申请号：EP07712624.1

申请日：2007-03-16

申请人： Nokia Corporation

发明人： ALANEN, Marko, J. ,  VILHONEN, Sami ,  VILANDER, Ari ,  HEIKKINEN, Jari

IPC分类号： H04B1/04 ,  H04B1/40 ,  H03H19/00

CPC分类号： H04B1/0475 ,  H03H19/008

摘要： A filtering method, a transceiver and a transmitter are provided. The transmitter comprises a power amplifier amplifying an RF signal and having multiple stages, and a local oscillator, the power amplifier comprising between at least two stages of the power amplifier an impedance circuitry for forming an impedance at a frequency related to the frequency of the local oscillator, and a switch for switching the impedance of the impedance circuitry means to RF frequency.