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參數(shù)資料
| 型號(hào)： | LMV791 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 運(yùn)算放大器 |
| 英文描述： | 17 MHz, Low Noise, CMOS Input, 1.8V Operational Amplifier |
| 中文描述： | 17兆赫，低噪聲，CMOS輸入，1.8V的運(yùn)算放大器 |
| 文件頁(yè)數(shù)： | 13/16頁(yè) |
| 文件大?。?/td> | 1005K |
| 代理商： | LMV791 |
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Application Notes
(Continued)
For simplicity, the op amp is modelled as an ideal integrator
with a unity gain frequency ofA
0
. Hence, its transfer function
(or gain) in the frequency domain is A
0
/s. Solving the circuit
equations in the frequency domain, ignoring C
for the mo-
ment, results in an expression for the gain shown in
Equation
(1)
.
(1)
It can be inferred from the denominator of the transfer func-
tion that it has two poles, whose expressions can be ob-
tained by solving for the roots of the denominator and are
shown in
Equation (2)
(2)
Equation (2)
shows that as the values of R
1
and R
2
are
increased, the magnitude of the poles, and hence the band-
width of the amplifier, is reduced. This theory is verified by
using different values of R
1
and R
2
in the circuit shown in
Figure 1
and by comparing their frequency responses. In
Figure 3
the frequency responses for three different values
of R
and R
are shown. When both R
and R
are 1 k
, the
response is flattest and widest; whereas, it narrows and
peaks significantly when both their values are changed to 10
k
or 30 k
. So it is advisable to use lower values of R
and
R
to obtain a wider and flatter response. Lower resistances
also help in high sensitivity circuits since they add less noise.
A way of reducing the gain peaking is by adding a feedback
capacitance C
in parallel with R
. This introduces another
pole in the system and prevents the formation of pairs of
complex conjugate poles which cause the gain to peak.
Figure 4
shows the effect of C
on the frequency response of
the circuit. Adding a capacitance of 2 pF removes the peak,
while a capacitance of 5 pF creates a much lower pole and
reduces the bandwidth excessively.
AUDIO PRE-AMPLIFIER WITH BANDPASS FILTERING
With low input referred voltage noise, low supply voltage and
low supply current, and a low harmonic distortion, the
LMV791 is ideal for audio applications. Its wide unity gain
bandwidth allows it to provide large gain for a wide range of
frequencies and it can be used to design a pre-amplifier to
drive a load of as low as 600
with less than 0.01% distor-
tion. Two amplifier circuits are shown in
Figure 5
and
Figure
6
.
Figure 5
is an inverting amplifier and provides a gain of
10, while
Figure 6
is a non-inverting amplifier and provides
a gain of 11. In either of these circuits, the coupling capacitor
C
decides the lower frequency at which the circuit starts
providing gain, while the feedback capacitor C
F
decides the
20116864
FIGURE 2.
20116859
FIGURE 3.
20116860
FIGURE 4.
L
www.national.com
13
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| LMV791MK | 17 MHz, Low Noise, CMOS Input, 1.8V Operational Amplifier |
| LMV791MKX | 17 MHz, Low Noise, CMOS Input, 1.8V Operational Amplifier |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMV791MK | 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 |
| LMV791MK/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 |
| LMV791MKX | 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 |
| LMV791MKX/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 |
| LMV792 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:17 MHz, Low Noise, CMOS Input, 1.8V Operational Amplifiers |
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