*version 9.1 3829625701
u 432
INTEG? 5
V? 10
E? 3
MULT? 7
SIN? 3
COS? 3
DIFF? 3
SUM? 7
GAIN? 2
? 6
PM? 3
*?? 2
TABLE? 2
R? 2
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n 0 103:06:29:09:45:02;1059464702 e 
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port 134 GND_ANALOG 490 430 h
port 238 GND_ANALOG 600 360 h
port 60 GND_ANALOG 240 300 h
port 9 GND_ANALOG 410 440 h
port 8 GND_ANALOG 110 230 h
port 31 GND_ANALOG 190 220 h
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part 3 INTEG 430 190 h
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part 211 MULT 540 420 h
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part 392 SUM 310 440 u
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part 7 VDC 410 400 h
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a 1 u 13 0 -21 3 hcn 100 DC=3.14159
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part 120 EVALUE 440 420 h
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a 0 u 13 0 -5 49 hln 100 EXPR=2/V(%IN+, %IN-)
part 59 VDC 240 260 h
a 0 sp 0 0 22 37 hln 100 PART=VDC
a 0 x 0:13 0 0 0 hln 100 PKGREF=i
a 1 xp 9 0 24 7 hcn 100 REFDES=i
a 1 u 13 0 -6 -2 hcn 100 DC=1
part 403 VSIN 300 250 h
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a 1 u 0 0 0 0 hcn 100 AC=0
a 1 u 0 0 0 0 hcn 100 VOFF=0
a 1 u 0 0 0 0 hcn 100 VAMPL=0
a 0 x 0:13 0 0 0 hln 100 PKGREF=noise_ni
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a 1 u 0 0 0 0 hcn 100 FREQ=1
part 404 VSIN 300 450 h
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a 1 u 0 0 0 0 hcn 100 AC=0
a 1 u 0 0 0 0 hcn 100 VOFF=0
a 1 u 0 0 0 0 hcn 100 VAMPL=0
a 0 x 0:13 0 0 0 hln 100 PKGREF=noise_phi
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a 1 u 0 0 0 0 hcn 100 FREQ=2
part 246 VSIN 600 310 h
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a 1 u 0 0 0 0 hcn 100 FREQ=.001
a 1 u 0 0 0 0 hcn 100 AC=0
a 1 u 0 0 0 0 hcn 100 VOFF=.78539
a 1 xp 9 0 -10 -10 hcn 100 REFDES=PHIa
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part 6 VDC 110 190 h
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a 0 x 0:13 0 0 0 hln 100 PKGREF=BETAc
a 1 xp 9 0 29 -8 hcn 100 REFDES=BETAc
a 1 u 13 0 4 -7 hcn 100 DC=0.3
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a 0 sp 0 0 16 32 hln 100 PART=MULT
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part 32 MULT 230 190 U
a 0 sp 0 0 16 32 hln 100 PART=MULT
a 0 a 0:13 0 0 0 hln 100 PKGREF=MULT1
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part 20 EVALUE 140 210 h
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@graphics
t 14 t 6 510 180 480 160 0 2
ni
t 16 t 6 390 180 360 160 0 6
dni/dt
t 15 t 6 510 350 480 330 0 3
phi
t 18 t 6 390 350 360 330 0 7
dphi/dt
t 19 t 6 300 330 250 350 0 9
d2phi/dt2
t 17 t 6 260 160 300 180 0 8
d2ni/dt2
t 416 t 6 200 510 100 260 0 367
Numerical solution of
the DC-SQUID
Langevin equations
Using 
   PSPICE STUDENT

Reference paper:

SQUID Magnetometers
for Low-Frequency
Applications.
T. Ryhanen and H Seppa.

Journal of Low temperature Physics, Vol 76 Nos 5/6, 1989
This example reproduces results in
pag 321 fig 14b.

Copyright.

Giorgio Fontana (2003)
University of Trento
ITALY