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參數(shù)資料
| 型號： | LMV771MGX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運算放大器 |
| 英文描述： | Single/Dual/Quad, Low Offset, Low Noise, RRO Operational Amplifiers |
| 中文描述： | OP-AMP, 1000 uV OFFSET-MAX, 3.5 MHz BAND WIDTH, PDSO5 |
| 封裝： | SC-70, 5 PIN |
| 文件頁數(shù)： | 15/21頁 |
| 文件大小： | 844K |
| 代理商： | LMV771MGX |
Application Note
(Continued)
HIGH PASS FILTER
In a similar approach, one can derive the transfer function of
a high pass filter. A typical first order high pass filter is shown
below:
Writing the KCL for this circuit :
(V
1
denotes the voltage between C and R
1
)
(12)
(13)
Solving these two equations to find the transfer function and
using:
(high frequency gain)
Which results:
and
(14)
Looking at the transfer function, it is clear that when f/f
O
is
small, the capacitor is open and hence no signal is getting in
to the amplifier. As the frequency increases the amplifier
starts operating. At f = f
O
the capacitor behaves like a short
circuit and the amplifier will have a constant, high frequency,
gain of H
O
. The bode plot of the transfer function follows:
BAND PASS FILTER
Combining a low pass filter and a high pass filter will gener-
ate a band pass filter. In this network the input impedance
forms the high pass filter while the feedback impedance
forms the low pass filter. Choosing the corner frequencies so
that f
1
<
f
2
, then all the frequencies in between, f
1
≤
f
≤
f
2
, will
pass through the filter while frequencies below f
1
and above
f
2
will be cut off.
The transfer function can be easily calculated using the
same methodology as before.
(15)
Where
The transfer function is presented in the following figure.
20039654
FIGURE 5.
20039658
FIGURE 6.
20039660
FIGURE 7.
L
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMV771MGX/NOPB | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMV772 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Single/Dual/Quad, Low Offset, Low Noise, RRO Operational Amplifiers |
| LMV772MA | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMV772MA/NOPB | 功能描述:運算放大器 - 運放 Low Noise,Dual Prec Op Amp RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMV772MAX | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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