Penguat Instrumentasi

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    Penguat Instrumentasi

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    Operational Amplifier (Op-Amp)

    Sifat Op-Amp Ideal

    Resistansi input ( Rin=)

    Resistansi output 0 (Rout=0)

    Penguatan tegangan loop terbuka ( A=)

    Bandwidth ( f= )

    Tegangan offset 0

    Jika V-= V+maka Vout= 0

    Vin= V+- V-

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    Inverting Amplifier

    VinVout

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    Inverting Amplifier

    =

    + =

    =

    = 0

    =0

    =

    =

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    Summing Amplifier

    V-

    =

    +

    + 3

    =

    +

    +

    3

    3

    0

    =

    0

    +

    0

    +

    3 0

    3

    =

    +

    +

    33

    Vout

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    Non-inverting Amplifier

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    Non-inverting Amplifier

    = 0

    + =

    0

    =

    =

    =

    = 1 +

    =

    =

    IF

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    Differential Amplifier

    3=

    + 3

    =3

    + 3 +

    0

    4=

    0

    + 4

    =4

    + 4

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    Differential Amplifier

    =

    3

    + 3 + =

    4

    + 4

    3

    + 3+

    + 3 =

    4

    + 4

    = 3

    + (

    + 3

    )(

    4

    + 4)

    Jika = dan 3 = 4

    =3

    =

    3

    One stage

    instrumentation

    amplifier

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    Instrumentation Amplifier

    Va

    Vb

    RG

    R1

    R2

    R3

    R4

    R5

    R6

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    Instrumentation Amplifier

    Penguatan pada input buffer

    + + =

    =+ +

    Jika R1= R2

    =2

    + 1

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    Instrumentation Amplifier

    Penguatan pada differential amplifier 0

    4+ 6=

    6

    =6

    4+ 6

    3+ 5=

    5

    5

    3+ 5+

    3

    3+ 5 =

    6

    4+ 6

    5

    3 (

    3+ 5

    3 )(

    6

    4+ 6) =

    Jika R3= R4 dan R5= R6

    =5

    3

    ( )

    =5

    3

    2

    + 1

    =5

    3

    2

    + 1

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    Instrumentation Amplifier

    Va

    Vb

    R1

    mR1

    nR1

    R/a

    R/a

    R

    R