*EL2227C  Model Rev.A 7/30/2002
*This is a single amplifier model for the EL2227
*The AC response for this model is based on Rf=620. Vs= +/-12V
*SR, voltage noise and current noise are modeled.
* connections:        +input
*                       |  -input
*                       |    | +Vsupply
*                       |    |    | -Vsupply
*                       |    |    |    |  output
*                       |    |    |    |    |
.subckt EL2227C         3    2    7    4    6
*
*Input Stage
vos 9 5 0.2mV
ios 5 500 0.06uA
is1 7 10 1mA
r1 11 4 800
r2 12 4 800
q1 11 9 10 qp
q2 12 2 10 qp
*
* Input bias current
ibp 500 3 1.8uA
ibn 500 2 1.8uA
*
* voltage noise generator
ie 0 30 2.121uA
ca 30 31 1GF
v1 31 0 dc 0V
de 30 0 den
h1 5 3 v1 1500
*
* current noise generator
iin 0 32 1uA
di 32 0 din
cb 32 33 1GF
v2 33 0 dc 0V
f1 2 9 v2 1.5
*
*Gain Stage
g1 13 500 11 12 5e-4
rp 13 500 3.25e6
vb 13 14 0V
cp 14 500 8p
*
*Slew rate stage
*rising limit
d1 14 499 dx
d2 14 50 dx
d3 50 499 dx
fp1 50 499 poly(1) vb -30.8e-1 1
*falling limit
d4 498 14 dx
d5 51 14 dx
d6 498 51 dx
fn1 498 51 poly(1) vb -30.8e-1 -1
*E1 stages
e1 15 500 14 500 1
r3 15 16 200
r4 16 17 300
c1 16 500 2.5p
c2 17 500 2p
*
*Output satage
is2 7 21 1.5mA
is3 19 4 1.5mA
r5 22 6 45
r6 23 6 45
q3 7 17 19 qn
q4 4 17 21 qp
q5 7 21 22 qn
q6 4 19 23 qp
*
*voltage reference
eref 500 0 poly(2) (7,0) (4,0) 0 0.5 0.5
esp 499 500 poly(1) (7,4) 0 0.5
esn 498 500 poly(1) (4,7) 0 0.5 
Iss 7 4 0.23mA
*models
.model qn npn ( bf=300)
.model qp pnp ( bf=300)
.model din d(kf=2.24e-16 af=1)
.model den d(kf=6.408e-17 af=1)
.model dx d(N=0.001)
.ends EL2227C
*$