MC3303 - MC3403 - MC3503

7/10

MULTIPLE FEEDBACK BANDPASS FILTER

TYPICAL PERFORMANCE CURVES

1/4

MC3403

V

CC

C

O

C

O

= 10C

C

R3

R2

R1

1

2

V

CC

=

C

Given f = center frequency ; chosse valuesf,C than

A (f ) = gain at center frequency

For less than 10% error from operational amplifier

QF

BW

If source impedance varies, filter may be preceded with voltage

follower buffer to stabilize filter parameters

o

o

o

oo

< 0.1 where f and BW are expressed in Hz

o

R3 =

R1 =

R2 =

Q

fC

p

o

R3

2A (f )

o

R1 R5

4Q R1-R5

2