Elliptical Filter
|
Components |
|
|
Operational amplifiers:3(Opamp 2) |
OA2_1-OA2_3 |
|
Resistors:15 |
R1-R15 |
|
Capacitors:7 |
C1-C7 |
Elliptical filter frequency
response with nominal component values.
|
Component variations |
Nominal value |
Variation at 1s |
|
R1 |
19.6KW |
1.0KW |
|
R2 |
196.0KW |
9.8KW |
|
R3 |
147.0KW |
7.4KW |
|
R4 |
1.0KW |
50 W |
|
R5 |
71.5 W |
3.6 W |
|
R6 |
37.4KW |
1.9KW |
|
R7 |
154.0KW |
7.7KW |
|
R8 |
260.0 W |
13.0 W |
|
R9 |
740.0 W |
37.0 W |
|
R10 |
402.0 W |
20.0 W |
|
R11 |
110.0KW |
5.0KW |
|
R12 |
110.0KW |
5.0KW |
|
R13 |
27.4KW |
1.4KW |
|
R14 |
40.0 W |
2.0 W |
|
R15 |
960.0 W |
48.0 W |
|
C1-C7 |
2.67nF |
0.13nF |
Elliptical filter frequency response
with component variation.
|
Hard fault table |
Faults |
No. of faults |
|
OA2_1-OA2_3 |
Opamp faults |
3x20=60 |
|
R1-R15 |
Stuck-open/short |
15x2=30 |
|
C1-C7 |
Stuck-open/short |
7x2=14 |
|
Total no. of faults: |
|
104 |
|
Soft fault table |
Nominal value |
-6s |
+6s |
|
R1 |
19.6KW |
13.6KW |
25.6KW |
|
R2 |
196.0KW |
137.2KW |
254.8KW |
|
R3 |
147.0KW |
102.6KW |
191.4KW |
|
R4 |
1.0KW |
700 W |
1.3KW |
|
R5 |
71.5 W |
49.9 W |
93.1 W |
|
R6 |
37.4KW |
27.8KW |
47.0KW |
|
R7 |
154.0KW |
107.8KW |
200.2KW |
|
R8 |
260.0 W |
182.0 W |
338.0 W |
|
R9 |
740.0 W |
518.0 W |
962.0 W |
|
R10 |
402.0 W |
282.0 W |
522.0 W |
|
R11-R12 |
110.0KW |
80.0KW |
140.0KW |
|
R13 |
27.4KW |
19.0KW |
35.8KW |
|
R14 |
40.0 W |
28.0 W |
52.0 W |
|
R15 |
960.0 W |
672.0 W |
1248 W |
|
C1-C7 |
2.67nF |
1.89nF |
3.45nF |
Elliptical Filter
.Subckt opamp 4 5 8 1 11
.MODEL mosn
NMOS
+ vto=1 kp=17u gamma=1.3 lambda=0.01 phi=0.7
+pb=0.8 mj=0.5 mjsw=.3 cgso=350p cgdo=350p cgbo=200p
+cj=300u cjsw=500p ld=0.8u tox=80n
.MODEL mosp
PMOS
+ vto=-1 kp=8u gamma=.6 lambda=0.02 phi=0.6
+pb=0.5 mj=0.5 mjsw=.25 cgso=350p cgdo=350p cgbo=200p
+cj=150u cjsw=400p ld=0.8u tox=80n
R1a 6 66 1
R1b 66 3 100meg
m1 66 4 3 3 mosp w=20u l=10u
R2a 7 77 1
R2b 77 3 100meg
m2 77 5 3 3 mosp w=20u l=10u
R3a 6 67 1
R3b 67 11 100meg
m3 67 6 11 11
mosn w=36u l=10u
R4a 7 78 1
R4b 78 11 100meg
m4 78 6 11 11
mosn w=36u l=10u
R5a 3 33 1
R5b 33 1 100meg
m5 33 2a 1 1 mosp w=30u l=10u
R6a 8 88 1
R6b 88 11 100meg
m6 88 7 11 11
mosn w=100u l=10u
R7a 8 89 1
R7b 89 1 100meg
m7 89 2 1 1 mosp w=42u l=10u
R8a 2 22 1
R8b 22 11 100
m8 22 6 11 11
mosn w=60u l=10u
R9a 2 23 1
R9b 23 1 100meg
m9 23 2 1 1 mosp w=30u l=10u
Rc 7 76 1
cc 76 8 6p
Rs 76 8 100meg
vbias 2a 0 .1
.ends
**Capacitor Block:
.SUBCKT CNET 1 2 3 4 5 6 7 8 9 10 11 12
13 14
CM1 1 2 2.6667NF
CM2 3 4 2.6667NF
CM3 5 6 2.6667NF
CM4 7 8 2.6667NF
CM5 9 10 2.6667NF
CM6 11 12 2.6667NF
CM7 13 14 2.6667NF
.ENDS CNET
*Capacitor fault block:
.SUBCKT RNET 1 2 3 4 5 6 7 8 9 10 11 12
13 14
RF1 1 2 1.0e8
RF2 3 4 1.0e8
RF3 5 6 1.0e8
RF4 7 8 1.0e8
RF5 9 10 1.0e8
RF6 11 12 1.0e8
RF7 13 14 1.0e8
.ENDS RNET
*MAIN CIRCUIT
vin 1 0 AC 1
X1 2 0 3 77 44 opamp
R1 1 2 19.6K
R2 2 3 196.0K
X2 9 7 9 77 44 opamp
R3 3 5 147.0K
R7 5 7 154.0K
R4 3 10 1.0K
R5 10 0 71.5
R6 6 8 37.4K
X3 15 14 15 77 44 opamp
R11 9 11 110.0K
R12 11 14 110.0K
R8 9 8 260.0
R9 8 4 740
R13 12 13 27.4K
R14 15 13 40.0
RM11 4 0 402.0
R15 13 0 960.0
V2 44 0 -15
V3 77 0 15
X4 2 3 10 6 5 8 6 7 4 12 13 11 12 14
CNET
X5 2 3 10 6 5 8 6 7 4 12 13 11 12 14
RNET
.ac dec 20 10
1g
.plot v(1) vdb(15)
.options list node post=2
.END