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Analisis Rangkaian Listrik Rangkaian Listrik - Ee-cafe.org

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R<br />

v<br />

2<br />

o1 = − v1<br />

R<br />

(11.10)<br />

1<br />

Jika v 1 dimatikan maka terminal inversi mendapat tegangan yang<br />

besarnya adalah<br />

v R<br />

+<br />

Tegangan di terminal non-inversi<br />

=<br />

1<br />

vo2<br />

R1<br />

R<br />

(11.11)<br />

2<br />

R<br />

v P<br />

+<br />

=<br />

4<br />

v2<br />

R3<br />

R<br />

(11.12)<br />

4<br />

Karena v = v P maka dari (11.11) dan (11.12) kita peroleh<br />

R1<br />

R4<br />

⎛ R4<br />

⎞⎛ R1<br />

+ R2<br />

⎞<br />

vo2<br />

= v2<br />

atau vo2<br />

=<br />

v2<br />

R1<br />

R2<br />

R3<br />

R<br />

⎜<br />

4<br />

R3<br />

R<br />

⎟<br />

⎜<br />

4 R<br />

⎟<br />

+ +<br />

⎝ +<br />

(11.13)<br />

⎠⎝<br />

1 ⎠<br />

Keluaran total adalah<br />

⎛ R2<br />

⎞ ⎛ R4<br />

⎞ ⎛ R1<br />

+ R2<br />

⎞<br />

vo<br />

= vo1<br />

+ vo2<br />

= −<br />

⎜ v1<br />

v2<br />

R<br />

⎟ +<br />

⎜<br />

1 R3<br />

R<br />

⎟<br />

⎜<br />

4 R<br />

⎟<br />

⎝ ⎠ ⎝ + ⎠ ⎝ 1 ⎠<br />

= −K1v1<br />

+ K2v2<br />

(11.14)<br />

Dalam keadaan khusus, jika kita buat R 1 = R 2 = R 3 = R 4 maka v o =<br />

v 2 − v 1 .<br />

COTOH 11.7:<br />

Carilah v o pada rangkaian di bawah ini.<br />

v 1<br />

R 2R v o<br />

R/2 −<br />

v<br />

B<br />

2 +<br />

R<br />

A<br />

Penyelesaian :<br />

Persamaan tegangan untuk simpul A dan B memberikan<br />

213

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