SIMPLE DIFFERENTIAL PAIR


VIN 1 0 DC 0V AC 1V sin(0 100mV 5MegHz)
VCC 8 0 12V
VEE 9 0 -12V
Q1 4 2 6 MOD1
Q2 5 3 6 MOD1
RS1 1 2 1k
RS2 3 0 1k
RC1 4 8 10k
RC2 5 8 10k
Q3 6 7 9 MOD1
Q4 7 7 9 MOD1
RBIAS 7 8 20k

.MODEL MOD1 NPN (BF=80 RB=100 CCS=2pF TF=0.3ns TR=6ns CJE=3pF CJC=2pF VA=50)

.OP
.DC VIN -250mV 250mV 5mV
.AC DEC 10 1 10GHz
.TRAN 5ns 2000ns
.TF V(5) VIN

*.plot dc V(5)
*.plot ac Vdb(5)
*.plot ac Vp(5)
*.plot tran V(5) V(4)
*.print transfer_function

.END