OP181/OP281/OP481

–14–

REV. 0

ECM1 11 98

POLY(2)

(1, 98) (2, 98) 0 .5 .5

R1

11 12

1.59E6

C1

11 12

100E-12

R2

12 98

283

*

* POLE AT 900kHz

*

EREF 98

0

(90, 0)

1

G1

98 20

(4, 6)

1E-6

R3

20 98

1E6

C2

20 98

177E-15

*

* POLE AT 500kHz

*

E2

21 98

(20, 98)

1

R4

21 22

1E6

C3

22 98

320E-15

*

* GAIN STAGE

*

CF

45

40

8. 5E-12

R5

40

98

65. 65E6

G3

98

40

(22, 98)

4.08E-7

D3

40

41

DX

D4

42

40

DX

V3

99

41

DC 0.5

V4

42

50

DC 0.5

*

* OUTPUT STAGE

*

ISY

99

50

1.375E-6

RS1

99

90

10E6

RS2

90

50

10E6

M1

45

46

99

99

POX L=1.5u

W=300u

M2

45

47

50

50

NOX L=1.5u

W=300u

EG1

99

46

POLY(1)

(98, 40)

0.77

1

EG2

47

50

POLY(1)

(40, 98)

0.77

1

*

* MODELS

*

.MODEL POX PMOS (LEVEL=2, KP=25E-6, VTO=-0.75, LAMBDA=0.01)

.MODEL NOX NMOS (LEVEL=2, KP=25E-6, VTO=0.75, LAMBDA=0.01)

.MODEL PIX

PNP

(BF=200)

.MODEL DX D(IS=1E-14)

.ENDS