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| 型号： | MF6 |
| 厂商： | National Semiconductor Corporation |
| 英文描述： | 6th Order Switched Capacitor Butterworth Lowpass |
| 中文描述： | 6阶巴特沃斯低通开关电容 |
| 文件页数： | 16/20页 |
| 文件大小： | 878K |
| 代理商： | MF6 |
2.0 Designing with the MF6
(Continued)
2.3 IMPLEMENTING A “NOTCH” FILTER WITH THE MF6
A “notch” filter with 60 dB of attenuation can be obtained by
using one of the Op-Amps, available in the MF6, and three
external resistors. The circuit and amplitude response are
shown in Figures 15, 16
The frequency where the “notch” will occur is equal to the
frequency at which the output signal of the MF6 will have the
same magnitude but be 180 degrees out of phase with its in-
put signal. For a sixth order Butterworth filter 180 phase
shift occurs where f = f
= 0.742 f
. The attenuation at this
frequency is 0.12 dB which must be compensated for by
making R
1
= 1.014 x R
2
.
Since R
does not equal R
there will be a gain inequality
above and below the notch frequency. At frequencies below
the notch frequency (f
<<
f
), the signal through the filter
has a gain of one and is non-inverting. Summing this with the
input signal through the Op-Amp yields an overall gain of two
or +6 dB. For f
>>
f
, the signal at the output of the filter is
greatly attenuated thus only the input signal will appear at
the output of the Op-Amp. With R
=R
=1.014 R
the over-
all gain is 0.986 or 0.12 dB at frequencies above the notch.
DS005065-25
FIGURE 12. Cascading Two MF6s
DS005065-26
FIGURE 13. One MF6-50 vs. Two MF6-50s Cascaded
DS005065-27
FIGURE 14. Phase Response of
Two Cascaded MF6-50s
www.national.com
16
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相关代理商/技术参数 |
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|---|---|
| MF6. 3FD101MD13TP | 制造商:nippon chemicon 功能描述: |
| MF6.3FC101MD13TP | 制造商:UCC 功能描述: 制造商:United Chemi-Con Inc 功能描述: |
| MF6.3FC22RMD6TP | 制造商:United Chemi-Con Inc 功能描述: |
| MF60 | 制造商:RIEDON 制造商全称:Riedon Powertron 功能描述:Film Resistors |
| MF6000-04 | 制造商:KAYNAR (ALCOA) 功能描述: |
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