BJT Example

.OPTION 	$ The options are listed below:
+ ingold=1	$ Use fixed-point and exponential form on output
+ numdgt=4	$ print 4 digits 
+ co = 132	$ 132-column output
+ post

.INC /nfs/guille/analog/m/moon/ece323/npn322.inc

Vcc	vcc	0	DC=7.5
Q1	c	b	e	npn322	
Rb1	vcc	b	50K
Rb2	b	0	25K
Rc	vcc	c	2.5K
Re	e	0	1K
Cin	vi	b	1u
Vin	vi	0	AC=1 SIN 0 amp 10K 0 0 180

.OP

.AC DEC 10 1 1G
.NET V(c) Vin
.PRINT AC Vdb(c)

.MEASURE AC A0 FIND VR(c) AT=10K		$ Measure the gain at 10kHz.
.MEASURE AC AdB FIND VdB(c) AT=10K		$ Measure the gain at 10kHz.
.MEASURE AC mzi FIND PAR('v(vi)/i(vin)') AT=10K $ Measure the input impedance.
.MEASURE AC mzo FIND ZOUT(M) AT=10K		$ Measure the out. imp. @10kHz.
.MEASURE AC fl WHEN VM(c)='.707*ABS(A0)'	$ Find the lower 3dB frequency.
.MEASURE AC fu WHEN VM(c)='.707*ABS(A0)' TD=1e5	$ Find the upper 3dB frequency.

.TRAN 1u 200u SWEEP amp POINTS 2 10m 30m
.PRINT TRAN V(c)

.END