Instrumentation Amplifier

• Instrumentation AmplifierOne drawback of the differential amplifier is that its input impedance () may not be high enough if the output impedance of the previous stage is not low enough. To overcome this problem, two non-inverters with high input resistance can be used each for one of the two inputs to the differential amplifier. The resulting circuit is shown below:
  
  The analysis of this circuit is very simple. As the output impedance of the non-inverter is low, the three op-amp circuit can be considered as three independent circuits. The outputs of the two non-inverters are:
  
  
  
  
  
  The output voltage of the differential amplifier is:
  
  
  
  
  
  Of course the two resistors  can be combined to become , i.e., , then the output can be written as:
  
  
  
  
  
  Alternatively, we consider the current going from  to :
  
  
  
  
  
  From the equation of the first two terms we get:
  
  
  
  
  
  From the equation of the second two terms we get:
  
  
  
  
  
  Using the equation of the differential amplifier above, we get the same result as above:
  
  
  

sumber : http://fourier.eng.hmc.edu/e84/lectures/opamp/node3.html

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Jadwal Semester II

Hari / Jam	Mata Kuliah
Senin	Nama
7.00 - 7.50		T
7.50 - 8.40	Elektronika	T
8.40 - 9.30	Elektronika	T
9.30 - 10.20	Elektronika	T
10.40 - 11.30	Kimia Terapan	T
11.30 - 12.20	Kimia Terapan	T
13.00 - 13.50	Kimia Terapan	P
13.50 - 14.40	Kimia Terapan	P
14.40 - 15.30	Kimia Terapan	P
15.50 - 16.40	Kimia Terapan	P
16.40 - 17.30
17.30 - 18.20
Selasa
7.00 - 7.50	Bahasa Indonesia	T
7.50 - 8.40	Bahasa Indonesia	T
8.40 - 9.30	Bahasa Indonesia	T
9.30 - 10.20	Elektronika	P
10.40 - 11.30	Elektronika	P
11.30 - 12.20	Elektronika	P
13.00 - 13.50	Elektronika	P
13.50 - 14.40
14.40 - 15.30	Mekanika Teknik	T
15.50 - 16.40	Mekanika Teknik	T
16.40 - 17.30
17.30 - 18.20
Rabu
7.00 - 7.50	Matematika Terapan II	T
7.50 - 8.40	Matematika Terapan II	T
8.40 - 9.30	Matematika Terapan II	T
9.30 - 10.20
10.40 - 11.30	Gambar Teknik II	P
11.30 - 12.20	Gambar Teknik II	P
13.00 - 13.50	Gambar Teknik II	P
13.50 - 14.40	Gambar Teknik II	P
14.40 - 15.30	Gambar Teknik II	P
15.50 - 16.40
16.40 - 17.30
17.30 - 18.20
Kamis
7.00 - 7.50	Termodinamika Teknik	T
7.50 - 8.40	Termodinamika Teknik	T
8.40 - 9.30	Termodinamika Teknik	T
9.30 - 10.20
10.40 - 11.30
11.30 - 12.20	Instrumentasi dan Pengukuran	P
13.00 - 13.50	Instrumentasi dan Pengukuran	P
13.50 - 14.40	Instrumentasi dan Pengukuran	P
14.40 - 15.30	Instrumentasi dan Pengukuran	P
15.50 - 16.40	Instrumentasi dan Pengukuran	P
16.40 - 17.30	Instrumentasi dan Pengukuran	P
17.30 - 18.20
Jumat
7.00 - 7.50
7.50 - 8.40
8.40 - 9.30
9.30 - 10.20
10.20 - 11.10
11.10 - 12.40
12.40 - 13.30
13.30 - 14.20
14.20 - 15.10
15.30 - 16.20
16.20 - 17.10
17.10 - 18.00

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