MC3403, MC3303

http://onsemi.com

7

1

2

1

2

1

2

pRC

Figure 13. Bi−Quad Filter

-

+

R2

C1

R

100 k

100 k

R2

R1

R3

C1

Bandpass

Output

R = 160 k

W

C = 0.001

mF

R1 = 1.6 M

W

R2 = 1.6 M

W

R3 = 1.6 M

W

= center frequency gain

= passband notch gain

R1 = QR

R2 =

C1 = 10 C

Q

R1

R

C

C

Notch Output

1/2

MC3403

1/2

MC3403

1/2

MC3403

1/2

MC3403

-

-

-

+

+

+

1

2

Figure 14. Function Generator

Triangle Wave

Output

Square Wave

Output

R2

R3

75 k

300 k

R1

100 k

C

-

f =

if R3 =

R2 R1

R2 +R1

+

1/2

MC3403

1/2

MC3403

-

+

Q

Figure 15. Multiple Feedback Bandpass Filter

1/2

MC3403

-

+

R1

C

C

R3

R2

Given:

Then:

R3 =

R2 =

R1 =

For less than 10% error from operational amplifier

If source impedance varies, filter may be preceded with

voltage follower buffer to stabilize filter parameters.

R3

R1 R5

< 0.1

BW

For:

= 1.0 kHz

= 10

= 1

= 1

Where: