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參數(shù)資料
| 型號： | LMV771MGX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運(yùn)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)： | 16/21頁 |
| 文件大?。?/td> | 844K |
| 代理商： | LMV771MGX |
Application Note
(Continued)
STATE VARIABLE ACTIVE FILTER
State variable active filters are circuits that can simulta-
neously represent high pass, band pass, and low pass fil-
ters. The state variable active filter uses three separate
amplifiers to achieve this task. A typical state variable active
filter is shown in
Figure 9
. The first amplifier in the circuit is
connected as a gain stage. The second and third amplifiers
are connected as integrators, which means they behave as
low pass filters. The feedback path from the output of the
third amplifier to the first amplifier enables this low frequency
signal to be fed back with a finite and fairly low closed loop
gain. This is while the high frequency signal on the input is
still gained up by the open loop gain of the 1st amplifier. This
makes the first amplifier a high pass filter. The high pass
signal is then fed in to a low pass filter. The outcome is a
band pass signal, meaning the second amplifier is a band
pass filter. This signal is then fed into the third amplifiers
input and so the third amplifier behaves as a simple low pass
filter.
The transfer function of each filter needs to be calculated.
The derivations will be more trivial if each stage of the filter is
shown on its own.
The three components are:
20039680
20039681
For A
1
the relationship between input and output is:
20039662
FIGURE 8.
20039674
FIGURE 9.
L
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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(yùn)算放大器 - 運(yùn)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(bǔ)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(fēng)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(yùn)算放大器 - 運(yùn)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(bǔ)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(fēng)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(yùn)算放大器 - 運(yùn)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(bǔ)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(fēng)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(yùn)算放大器 - 運(yùn)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(bǔ)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(fēng)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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