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LS204CN 数据表(PDF) 10 Page - STMicroelectronics

部件名 LS204CN
功能描述  High performance dual operational amplifier
Download  16 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

LS204CN 数据表(HTML) 10 Page - STMicroelectronics

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Application information for active low-pass filters
LS204
10/16
4.5
Example
Figure 14.
5th order low-pass filter (Butterworth) with unity gain configuration
In the circuit of Figure 14, for Fc = 3.4 kHz and Ri = R1 = R2 = R3 = 10 kW, we obtain:
The attenuation of the filter is 30 dB at 6.8 kHz and better than 60 dB at 15 kHz.
The same method, referring to Table 7 and Figure 15 is used to design high-pass filters.
In this case the damping factor is found by taking the reciprocal of the numbers in Table 7.
For Fc = 5 kHz and Ci = C1 = C2 = C3 = 1 nF we obtain:
Figure 15.
5th order high-pass filter (Butterworth) with unity gain configuration
C2
R2
R1
C1
Ri
Ci
C4
R4
R3
C3
Ci = 1.354
1
R
----
1
2
πfc
------------ = 6.33nF
C1 = 0.421
1
R
----
1
2
πfc
------------ = 1.97nF
C2 = 1.753
1
R
----
1
2
πfc
------------ = 8.20nF
C3 = 0.309
1
R
----
1
2
πfc
------------ = 1.45nF
C4 = 3.325
1
R
----
1
2
πfc
------------ = 15.14nF
Ri =
1
0.354
---------------
1
C
----
1
2
πfc
------------ = 25.5k
Ω
R1 =
1
0.421
---------------
1
C
----
1
2
πfc
------------ = 75.6k
Ω
R2 =
1
1.753
---------------
1
C
----
1
2
πfc
------------ = 18.2k
Ω
R3 =
1
0.309
---------------
1
C
----
1
2
πfc
------------ = 103k
Ω
R4 =
1
3.325
---------------
1
C
----
1
2
πfc
------------ = 9.6k
Ω
R2
C2
C1
R1
Ri
Ci
R4
C3
R3
C4


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