Post subject: LINC Transmitter -> Output Combiner Posted:
Thu Jul 19, 2007 8:56 am
Joined: Sun Mar 06,
2005 8:02 am
I was reading about the LINC
transmitter topology, in which a varying-envelope signal is converted
into two constant envelope signals that can be amplified using two nonlinear
amplifiers, and then combined to the orignal, but amplified signal.
I read in several places that this method is not commonly used
due to the lack of appropriate combiner for the output signals. Why
is that? What is the requirement for such a combiner, that a regular
passive combiner (i.e. wilkinson), does not fulfil?
Post subject: Posted: Mon
Jul 23, 2007 1:10 pm
Joined: Mon Jun 27,
2005 2:02 pm
toplology is mainly used for wideband modulation schemes such as OFDM
and WCDMA. It is required that the combiner will be wideband. Wilkinson
combiners/splitters are everything but wideband, therefore, they can't
be used in LINC transmitters.