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fundamentals of engineering supplied-reference handbook - Ventech!

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First-Order Low-Pass Filters<br />

P<br />

H ( jω)<br />

0 ωc ω<br />

1<br />

H( jω c ) = H (0)<br />

2<br />

Frequency Response<br />

V2<br />

RP<br />

1<br />

H()<br />

s = = •<br />

V R 1+<br />

sR C<br />

R<br />

1 1 P<br />

RR<br />

1<br />

= ω =<br />

R R R C<br />

1 2<br />

c<br />

1+ 2 P<br />

V2<br />

R2<br />

1<br />

H()<br />

s = = •<br />

V R 1+<br />

sL R<br />

1 S S<br />

RS<br />

RS = R1+ R2<br />

ω c =<br />

L<br />

I2<br />

RP<br />

1<br />

H()<br />

s = = •<br />

I R 1+<br />

sR C<br />

R<br />

P<br />

1 2 P<br />

RR<br />

1<br />

= ω =<br />

R R R C<br />

1 2<br />

c<br />

1+ 2 P<br />

179<br />

ELECTRICAL AND COMPUTER ENGINEERING (continued)<br />

ANALOG FILTER CIRCUITS<br />

Analog filters are used to separate signals with different frequency content. The following circuits<br />

represent simple analog filters used in communications and signal processing.<br />

First-Order High-Pass Filters<br />

H ( jω)<br />

0 ωc ω<br />

H( jω c ) =<br />

1<br />

H ( j∞)<br />

2<br />

Frequency Response<br />

V2<br />

R2<br />

sRSC H()<br />

s = = •<br />

V R 1+<br />

sR C<br />

1 S S<br />

1<br />

RS = R1+ R2<br />

ω c =<br />

RC<br />

V2<br />

RP<br />

sL RP<br />

H()<br />

s = = •<br />

V R 1+<br />

sL R<br />

i1<br />

R<br />

P<br />

P<br />

S<br />

1 1 P<br />

RR R<br />

= ω =<br />

R R L<br />

1 2 P<br />

c<br />

1+ 2<br />

R1<br />

R 2<br />

I2<br />

RP sL RP<br />

H()<br />

s = = •<br />

I R 1+<br />

sL R<br />

R<br />

1 2 P<br />

RR R<br />

= ω =<br />

R R L<br />

1 2 P<br />

c<br />

1+ 2<br />

i2

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