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參數(shù)資料
| 型號(hào)： | LPV531 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Programmable Micropower CMOS Input, Rail-to-Rail Output Operational Amplifier |
| 中文描述： | 可編程微CMOS輸入，軌到軌輸出運(yùn)算放大器 |
| 文件頁(yè)數(shù)： | 16/17頁(yè) |
| 文件大?。?/td> | 955K |
| 代理商： | LPV531 |
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Typical Application
(Continued)
For simplicity, the op amp is modelled as an ideal integrator
with a unity gain frequency ofA
. Hence, its transfer function
(or gain) in the frequency domain is A
/s. Solving the circuit
equations in the frequency domain, ignoring C
for the mo-
ment, results in the following equation for the gain:
(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:
(2)
Equation (2)
shows that as the values of R
and R
are
increased, the magnitude of the poles is reduced, and hence
the bandwidth of the amplifier is decreased. Furthermore, R
1
and R
2
are related by the gain of the amplifier.
A
V
= R
2
/R
1
, or alternatively
R
2
= A
V
R
1
It is the presence of pairs of poles in
Equation (2)
that causes
gain peaking. In order to eliminate this effect, the poles
should be placed in Butterworth position, since poles in
Butterworth position do not cause gain peaking. To achieve a
Butterworth pair, the quantity under the square root in Equa-
tion 2 should be set to equal 1. Using this fact and the
relation between R
and R
, the optimum value for R
can be
found. This is shown in
Equation (3)
. If R
is chosen to be
larger than this optimum value, gain peaking will occur.
(3)
In
Figure 9
, C
is added to compensate for input capacitance
and to increase stability. In addition, C
reduce or eliminates
the gain peaking that can be caused by having a larger
feedback resistor.
L
www.national.com
16
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