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參數(shù)資料
| 型號(hào)： | LMV721 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 10MHz, Low Noise, Low Voltage, and Low Power Operational Amplifier |
| 中文描述： | 10MHz的，低噪聲，低電壓，低功耗運(yùn)算放大器 |
| 文件頁數(shù)： | 10/15頁 |
| 文件大?。?/td> | 459K |
| 代理商： | LMV721 |
Application Notes
(Continued)
4.3 Single-Supply Inverting Amplifier
There may be cases where the input signal going into the
amplifier is negative. Because the amplifier is operating in
single supply voltage, a voltage divider using R
and R
is
implemented to bias the amplifier so the input signal is within
the input common-common voltage range of the amplifier.
The capacitor C
is placed between the inverting input and
resistor R
1
to block the DC signal going into the AC signal
source, V
. The values of R
1
and C
1
affect the cutoff fre-
quency, fc =
1
2
π
R
1
C
1
.
As a result, the output signal is centered around mid-supply
(if the voltage divider provides V
+
/2 at the non-inverting in-
put). The output can swing to both rails, maximizing the
signal-to-noise ratio in a low voltage system.
4.4 Active Filter
4.4.1 Simple Low-Pass Active Filter
The simple low-pass filter is shown in Figure 9 Its low-pass
frequency gain (
ω →
o) is defined by R
/R
. This allows
low-frequency gains other than unity to be obtained. The fil-
ter has a 20dB/decade roll-off after its corner frequency fc.
R
should be chosen equal to the parallel combination of R
1
and R
to minimize error due to bais current. The frequency
response of the filter is shown in Figure 10
Note that the single-op-amp active filters are used in to the
applications that require low quality factor, Q(
≤
10), low fre-
quency (
≤
5KHz), and low gain (
≤
10), or a small value for the
product of gain times Q(
≤
100). The op amp should have an
open loop voltage gain at the highest frequency of interest at
least 50 times larger than the gain of the filter at this fre-
quency. In addition, the selected op amp should have a slew
rate that meets the following requirement:
Slew Rate
≥
0.5 x (
ω
H
V
OPP
) X 10
6
V/μsec
Where
ω
is the highest frequency of interest, and V
OPP
is
the output peak-to-peak voltage.
DS100922-22
FIGURE 7. Two-op-amp Instrumentation Amplifier
DS100922-23
FIGURE 8. Single-Supply Inverting Amplifier
DS100922-24
FIGURE 9. Simple Low-Pass Active Filter
DS100922-25
FIGURE 10. Frequency Response of Simple Low-pass
Active Filter in
Figure 9
www.national.com
10
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