*EL2125C  Model Rev.A 
*SR, voltage noise and current noise are modeled.
*Ultra low noise, low power, widebanc amplifier
*
* connections:        +input
*                       |  -input
*                       |    | +Vsupply
*                       |    |    | -Vsupply
*                       |    |    |    |  output
*                       |    |    |    |    |
.subckt EL2125C         3    2    7    4    6
*
* Input stage
*
vos 9 5 0.6mV
ios 5 500 0.4uA
iee 34 10 100mA
e1 34 0 7 0 1
e2 35 0 4 0 1
r1 12 35 10
r2 11 35 10
q1 12 2 10 qp
q2 11 9 10 qp

* voltage noise generator
ie 0 30 3.121mA
ca 30 31 1GF
v1 31 0 dc 0V
de 30 0 den
h1 5 3 v1 12

* current noise generator
iin 0 32 3.121mA
di 32 0 din
cb 32 33 1GF
v2 33 0 dc 0V
f1 2 9 v2 1

*Gain stage
g1 13 500 11 12 1.18e-3
r3 13 500 1.11Meg
c1 13 500 4pF

*E3 and E4 stage
e3 14 500 13 500 1
r4 14 15 200
r5 15 16 200
c2 15 500 2pF
c3 16 500 2pF
e4 17 500 16 500 1
r6 17 18 200
r7 18 19 200
c4 18 500 2pF
c5 19 500 2pF
* pole stage
e5 20 500 19 500 3
r14 20 21 796
r8 21 500 398
c6 20 21 2pF
e6 22 500 21 500 2.65
r9 22 23 704
r10 23 500 426
c7 22 23 2pF
*E7 stage
e7 24 500 23 500 1
r11 24 25 150
c8 25 500 2pF
*
* Output Stage
*
ios1 7 26 1.5mA
ios2 27 4 1.5mA
q3  4 25 26 qp
q4  7 26 29 qn
q5  7 25 27 qn
q6  4 27 28 qp
r12 28 6 25
r13 6 29 25
*
* Power Supply Current
*
ips 7 4 7mA
*
*voltage reference
eref 500 0 poly(2) (34,0) (35,0) 0 0.5 0.5
* Models
*
.model qn  npn(bf=2.08e3)
.model qp pnp(bf=2.08e3)
.model din d(kf=1.922e-16 af=1)
.model den d(kf=6.408e-17 af=1)
.ends EL2125C
*$