A simple amplifier as example for Harmonic Balance.

examples/hb/amp2n2222/2N2222A.txt

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+**************************************
+*      Model Generated by MODPEX     *
+*Copyright(c) Symmetry Design Systems*
+*         All Rights Reserved        *
+*    UNPUBLISHED LICENSED SOFTWARE   *
+*   Contains Proprietary Information *
+*      Which is The Property of      *
+*     SYMMETRY OR ITS LICENSORS      *
+*Commercial Use or Resale Restricted *
+*   by Symmetry License Agreement    *
+**************************************
+* Model generated on Feb 28, 13
+* MODEL FORMAT: PSpice
+.MODEL Q2n2222a npn
++IS=3.88184e-14 BF=929.846 NF=1.10496 VAF=16.5003
++IKF=0.019539 ISE=1.0168e-11 NE=1.94752 BR=48.4545
++NR=1.07004 VAR=40.538 IKR=0.19539 ISC=1.0168e-11
++NC=4 RB=0.1 IRB=0.1 RBM=0.1
++RE=0.0001 RC=0.426673 XTB=0.1 XTI=1
++EG=1.05 CJE=2.23677e-11 VJE=0.582701 MJE=0.63466
++TF=4.06711e-10 XTF=3.92912 VTF=17712.6 ITF=0.4334
++CJC=2.23943e-11 VJC=0.576146 MJC=0.632796 XCJC=1
++FC=0.170253 CJS=0 VJS=0.75 MJS=0.5
++TR=1e-07 PTF=0 KF=0 AF=1
+

examples/hb/amp2n2222/amp2n2222_mod.cir

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+.title KiCad schematic
+.include "D:/Spice_general/KiCad-1000/HB/amp2n2222/2N2222A.txt"
+.param freq=1.5Meg
+.csparam freq={freq}
+R4 Net-_Q1-B_ 0 2.2k
+C1 in Net-_Q1-B_ 10u
+R3 Net-_R1-Pad1_ Net-_Q1-B_ 10k
+V2 in 0 DC 0 SIN( 0 50m {freq} 0 0 0 ) AC 1  
+R1 Net-_R1-Pad1_ out1 560
+V1 Net-_R1-Pad1_ 0 DC 12 
+R5 out2 0 3.3k
+C2 out1 out2 10u
+R2 Net-_Q1-E_ 0 180
+Q1 out1 Net-_Q1-B_ Net-_Q1-E_ Q2n2222a
+
+.control
+*tran 1n 10u
+*pyplot in out2
+*ac dec 10 1 100Meg
+*pyplot db(out2)
+*destroy all
+*set hb_verbose
+hb $&freq 8
+display
+set xbrushwidth=3
+plot db(out2) combplot ylimit -200 0
+*pyplot db(out1) db(out2) combplot
+*gnuplot gout db(out1) db(out2) combplot
+print hbfrequency db(out1) db(out2)
+*quit
+.endc
+
+.end