Sallen-Key Band-Pass Filter

low-pass

R

1

10000

Ω

R

2

10000

Ω

C

1

10

μF

C

2

10

μF

R

4



R

3

0

0.5

1

10

100

stages

1

high-pass

R

1

10000

Ω

R

2

10000

Ω

C

1

10

μF

C

2

10

μF

R

4



R

3

0

0.5

1

10

100

Stages

1

plot settings

center freq

1

10

100

BW (decades)

2

4

6

autoscale

max

0

min

-50

Bode plots

single high-pass

single low-pass

overall

Sallen–Key topology filters are second-order active filters whose simplicity makes them a popular choice for general filtering applications. In this Demonstration, Bode plots are produced for single-stage low-pass and high-pass filters or a combination of these filters, up to 10 stages each.