4

510 - 12 - 08

7

100k

3

2

VC

4

5

6

1

0µ1 5k6

10

R

9

56

R

C

-

E

V = 1.3 V DC

B

8

B

-

GT

R

0µ22

1µ0

R

MPO

0µ1

50k

ED1913

100k

21k

3k9

0µ1

R

GT

R

VC

RL

AC

//21K

R

S

5.6 k

56//R

E

Gain of Stage A = 20 log

Gain of Stage B = 20 log

Gain of Stage C = 20 log

4

0

-4

-8

-12

-16

-20

20

200

2k

20k

FREQUENCY (Hz)

Fig. 5 I/O Curves at Various R

MPO

Values

R

R

R

R

R

R

R

Fig. 6 Closed Loop Frequency Response

with Various C

S

Values

-140

-120

-100

-80

-60

-40

INPUT (dBV)

-90

-80

-70

-60

-50

-40

INPUT (dBV)

R

R

R

Fig. 4 I/O Curves at Various R

VC

Settings

All resistors in ohms, all capacitors in farads unless otherwise stated.

Fig 3 Typical Hearing Instrument Application

5

-5

-15

-25

-35

-45

-55

-65

-75

≈

0.7

0.8

0.9

1

1.1

1.2

1.3

1.4

SUPPLY VOLTAGE (V)

Fig. 7 Gain vs Supply Voltage

0

-2

-4

-6

-8

-10

-12

-14

-16

-18

-20

5

0

-5

-10

-15

-20

-25

-30

C

C

C

C