1 difpair ckt - simple differential pair
2 * modified from Spice-3 examples
4 *>.opt rstray cstray outwidth=80
7 vin 1 0 sin(0 0.1 5meg) ac 1 dc 0
19 .model qnl npn(bf=80 rb=100 va=50 tr=.01)
30 *>.plot tran v(5)(0,12)
34 *>.plot ac vm(5)(0,100) vp(5)(-180,180)