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TS616IDW Datasheet(PDF) 29 Page - STMicroelectronics

No. de pieza TS616IDW
Descripción Electrónicos  Dual wide band operational amplifier with high output current
PDF  36 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TS616IDW Datasheet(HTML) 29 Page - STMicroelectronics

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TS616
Choosing the feedback circuit
29/36
9.1
The bias of an inverting amplifier
A resistance is necessary to achieve good input biasing, such as resistance R, shown in
Figure 66.
The magnitude of this resistance is calculated by assuming the negative and positive input
bias current. The aim is to compensate for the offset bias current, which could affect the
input offset voltage and the output DC component. Assuming Ib-, Ib+, Rin, Rfb and a zero
volt output, the resistance R is:
R = Rin // Rfb
Figure 66.
Compensation of the input bias current
9.2
Active filtering
Figure 67.
Low-pass active filtering - Sallen-Key
From the resistors Rfb and RG, we can directly calculate the gain of the filter in a classic non-
inverting amplification configuration:
We assume the following expression as the response of the system:
R
Load
Output
Rfb
Rin
Ib-
Ib+
Vcc+
Vcc-
TS616
+
_
R
Load
Output
Rfb
Rin
Ib-
Ib+
Vcc+
Vcc-
TS616
+
_
+
_
RG
IN
Rfb
910
Ω
TS616
25
Ω
OUT
R1
R2
C2
C1
+
_
RG
IN
Rfb
910
Ω
TS616
25
Ω
OUT
R1
R2
C2
C1
A
V
g1
R
fb
R
g
--------
+
==
T
j
ω
Vout
j
ω
Vin
j
ω
-----------------
g
12
ζ
j
ω
ω
c
-----
j
ω
()
2
ω
c
2
------------
++
-----------------------------------------
==



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