**** 11/14/100 10:22:52 ******** NT Evaluation PSpice (July 1997) ************
* Kathleen Williams, ps2t2, ece 202
****     CIRCUIT DESCRIPTION  ************************************************

* Student ID# 0194633

* Varying voltages for the opamps
Vpos 10 0 dc 20
Vneg 20 0 dc -20

* Opamp #1
Is = 0 1 0.0001
r1 1 2 10000
x1 0 3 5 10 20 3000 200 604 kewopamp

* Opamp #2
r2 2 3 5000
r3 3 4 10000
r4 4 0 36300
r5 4 5 10000
x2 0 3 10 20 5 LM324

* Opamp #3
r6 5 5a 4700
r7 6 7 10000
r8 6 0 3300
x3 6 5a 7 10 20 40000 200 37 kewopamp

.lib a:\kewps1t20.lib
.lib a:\Eval.lib

* control statements to supress output:
.options nopage, nobias
* control statement to do d.c analysis:
.dc Is list 0.0001
* print resultant outputs:
.print dc V(2,0),V(5,0),V(7,0)


  Is          V(2,0)      V(5,0)      V(7,0)      

   1.000E-04   5.000E-01  -2.277E+00  -9.175E+00


Library File

* subcircuit kewopamp.cir - dkg f00
.subckt kewopamp v_plus v_minus v_out V_pos V_neg Rin Eamp Rout
*
* An "almost ideal" opamp with the output voltage 
*  limited to the power supply rails V_pos & V_neg
* v_plus  = "+" terminal input
* v_minus = "-" terminal input
* v_out   = output terminal
* V_pos   = positive supply voltage node
* V_neg   = negative supply voltage node

Rin  v_plus v_minus 2.e+5
Eamp v_1 0 v_plus v_minus 2.e+5
Rout v_1 v_out 75
Dpos v_out V_pos Dmod
Dneg V_neg v_out Dmod
.model Dmod D (N=1u)
.ends
.end