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参数资料
| 型号： | 5962F0723201VXC |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 运算放大器 |
| 英文描述： | OP-AMP, 550 MHz BAND WIDTH, CDFP8 |
| 封装： | ROHS COMPLIANT, HERMETIC SEALED, CERAMIC, FP-8 |
| 文件页数： | 8/20页 |
| 文件大小： | 397K |
| 代理商： | 5962F0723201VXC |
Active filtering
RHF350
16/20
Doc ID 15604 Rev 2
7
Active filtering
Figure 29.
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 is the response of the system.
The cut-off 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 very stable resistor and capacitor values. In the case of R1=R2=R:
Due to a limited selection of capacitor values in comparison with resistor values, we can set
C1=C2=C, so that:
+
_
R
G
IN
R
fb
100
Ω
OUT
R1
R2
C2
C1
AM00840
A
V
g1
R
fb
R
g
--------
+
==
T
j
ω
Vout
j
ω
Vin
j
ω
-----------------
g
12
ζ
j
ω
c
-----
j
ω
()
2
ω
c
2
------------
++
-----------------------------------------
==
ω
c
1
R1R2C1C2
-------------------------------------
=
ζ
1
2
---
ω
c C1R1
C
1R2
C
2R1
C
1R1g
–
++
()
=
ζ
2C
2
C
1
R
fb
R
g
--------
–
2C
1C2
---------------------------------
=
ζ
2R
2
R
1
R
fb
R
g
--------
–
2R
1R2
---------------------------------
=
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