waseda-rfic wrote on May 22nd, 2009, 1:54am:what abot the am-am am-pm means? for in-band or out-band?
AM/AM and AM/PM affects both in-band and out-band characteristics.
waseda-rfic wrote on May 22nd, 2009, 1:54am:the simulation am-am and am-pm of the two pa are nearly similar.
but the simulaton im3 has 10 dbc difference. why the im3 has so lage difference?
You described too few informations, so I can't say something surely.
The following is one possiblity for your case.
Maybe AM/AM characteristics of one PA is dominated by output nonlinearity rather than input nonlinearity.
On the other hand, AM/AM characteristics of the other PA is dominated by input nonlinearity.