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Op Amp Applications from Analog Devices - Get a Free Blog

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IN<br />

V O<br />

V IN<br />

-<br />

LOWPASS<br />

R<br />

IN OUT<br />

V O<br />

V IN<br />

Rin<br />

=<br />

=<br />

F o =<br />

C<br />

Rf<br />

Rin<br />

1<br />

sC R + 1<br />

1<br />

sC R2 + 1<br />

Rf<br />

Ho = -<br />

Rin<br />

Rf<br />

H o = -<br />

Rin<br />

F o =<br />

1<br />

2π R C<br />

-<br />

+<br />

1<br />

2π Rf C<br />

SINGLE POLE<br />

C<br />

Rf<br />

IN<br />

OUT<br />

V O<br />

V IN<br />

Figure 5-66: Single pole filter design equations<br />

-<br />

ANALOG FILTERS<br />

FILTER REALIZATIONS<br />

HIGHPASS<br />

C<br />

IN OUT<br />

F o =<br />

sC R<br />

sC R + 1<br />

Rf<br />

Rin<br />

R<br />

sC R1<br />

sC R1 + 1<br />

Rf<br />

H - o = - o =<br />

Rin<br />

F o =<br />

1<br />

2π R C<br />

C Rin Rf<br />

V O<br />

V IN<br />

=<br />

=<br />

-<br />

+<br />

1<br />

2π Rin C<br />

OUT<br />

5.81

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