Are your questions focusing on very specific vendor's simulator, Cadence Spectre ?
If so, post to simulator's board not design's board.
purplewolf wrote on Jun 22nd, 2010, 3:40am:I sweep the input power from -60dbm to 30 dbm whereas my amplifier inout referred one db (Pin 1dB) is at 20 dbm.
So, according to theory my IIP3 must be 20+9.6 or greater than that factor but I am getting IIP3 of 14 dBm ???
What scheme do you use for input and output in Class-B amplifier ?
Class-B Push-Pull using 180deg-Hybrid or transformer ?
If so, your result of IIP3 is relative reasonable, since 20+9.6-12=17.6dBm is close to 14dBm.
purplewolf wrote on Jun 22nd, 2010, 3:40am:while moderate or small signal means analysis interms of volterra series expansion (weakly non-linear)..
No. Both moderate and small signals are not volterra series expansion.
And small signal in PSS/PAC or QPSS/QPAC is pure linear analysis around periodical or quasi-periodical steady state operation points.
purplewolf wrote on Jun 22nd, 2010, 3:40am:Do i need to provide different power levels if i choose one tone as large while other as moderate??
No.
But valid signal level for small signal in PSS/PAC and QPSS/QPAC is 10dB smaller than P1dBin(Input Refered 1dB Gain Compression Point) as Class-A amplifer.
You had better set level of moderate signal in QPSS smaller than P1dBin(Input Refered 1dB Gain Compression Point) as Class-A amplifer especially for Shooting-Newton QPSS.
See threads after following.
http://www.designers-guide.org/Forum/YaBB.pl?num=1262828862/18#18