difpair ckt - simple differential pair
* modified from Spice-3 examples

*>.opt rstray cstray outwidth=80
*.tf v(5) vin
*.dc vin -0.25 0.25 0.005
*.ac dec 10 1 10ghz

vin 1 0 sin(0 0.1 5meg) ac 1 dc 0
vcc 8 0 12
vee 9 0 -12
q1 4 2 6 0 qnl
q2 5 3 6 0 qnl
rs1 1 2 1k
rs2 3 0 1k
rc1 4 8 10k
rc2 5 8 10k
q3 6 7 9 0 qnl
q4 7 7 9 0 qnl
rbias 7 8 20k
*.model qnl npn(bf=80 rb=100 ccs=2pf tf=0.3ns tr=6ns cje=3pf cjc=2pf
*+   va=50)
.model qnl npn(bf=80 rb=100 va=50 ccs=2pf tf=0.3ns tr=6ns cje=3pf cjc=2pf)

*>.print op v(1,2,3,4,5,6,7,8,9)
*>.op
*>.print op vb(q*)
*>.op
*>.print op vbi(q*)
*>.op
*>.print op i(v*)
*>.op
*>.print op ic(q*)
*>.op
*>.print op ice(q*)
*>.op
*>.print op ib(q*)
*>.op
*>.print op ipi(q*)
*>.op
*>.print op imu(q*)
*>.op
*>.print op ie(q*)
*>.op
*>.print op vbe(q*)
*>.op
*>.print op vbei(q*)
*>.op
*>.print op vbc(q*)
*>.op
*>.print op vbci(q*)
*>.op
*>.print op gm(q*)
*>.op
*>.print op gpi(q*)
*>.op
*>.print op gmu(q*)
*>.op
*>.print op gx(q*)
*>.op
*>.print op go(q*)
*>.op
*>.print op cpi(q*)
*>.op
*>.print op cmu(q*)
*>.op
*>.print op cbx(q*)
*>.op
*>.print op ccs(q*)
*>.op
*>.print op i(r*)
*>.op
*>.print op p(r*)
*>.op
*>.print op i(v*)
*>.op
*>.print op p(v*)
.op
*>.status notime
.end