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TS615IPWT Datasheet(PDF) 31 Page - STMicroelectronics

Part # TS615IPWT
Description  DUAL WIDE BAND OPERATIONAL AMPLIFIER WITH HIGH OUTPUT CURRENT
PDF  36 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TS615IPWT Datasheet(HTML) 31 Page - STMicroelectronics

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Choosing the Feedback Circuit
TS615
31/36
10.2 Active filtering
From the resistors Rfb and RG we can directly calculate the gain of the filter in a classical, non-inverting
amplification configuration:
We assume the following expression as the response of the system:
The cutoff frequency is not gain-dependent and so becomes:
The damping factor is calculated by the following expression:
The higher the gain the more sensitive the damping factor is. When the gain is higher than 1, it is
preferable to use some very stable resistor and capacitor values. In the case of R1=R2:
Figure 72. Low-pass active filtering. Sallen-Key
+
_
RG
IN
Rfb
910
Ω
TS615
25
Ω
OUT
R1
R2
C2
C1
+
_
RG
IN
Rfb
910
Ω
TS615
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
--------------
++
---------------------------------------------
==
ω
c
1
R1R2C 1C2
--------------------------------------
=
ζ
1
2
---
ω
c
C
1
R
1
C
1
R
2
C
2
R
1
C
1
R
1
g
–
++
()
=
ζ
2C
2
C
1
R
fb
R
g
----------
–
2C
1
C
2
------------------------------------
=



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