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5962-9325901 Datasheet

  • 5962-9325901

  • Ultra Low Noise Wideband Op Amp

  • NSC

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R
s =
75鈩?/div>
C
in
39pF
R
in
75鈩?/div>
I
cc
=5mA
75鈩?/div>
CLC425
R
f =
124鈩?/div>
75鈩?/div>
C
f
+V
cc
R
f
CLC425
R
g =
124鈩?/div>
C
f =
10pF
R
b
A
v
= 鈭?/div>
I
in
鈭?/div>
R
f
Figure 8: External Shunt Compensation
Figure 11: Transimpedance Amplifier Configuration
Inverting Gains Less Than 10V/V
The lag compensation of Figure 9 will achieve stability
for lower gains. Placing the network between the two
input terminals does not affect the closed-loop nor noise
gain, but is best used for the invering configuration
because of its affect on the non-inverting input imped-
ance.
V
in
R
g
R
f
V
out
R
C
R
b
CLC425
R
out
R
L
Figure 12: Transimpedance Amplifier Frequency Response
Figure 9: External Lag Compensation
Single-Supply Operation
The CLC425 can be operated with single power supply
as shown iin Figure 10. Both the input and output are
capacitively coupled to set the dc operating point.
V
cc
R
V
ac
C
R
CLC425
C
R
out
R
L
R
f
R
g
C
V
cc
2
V
cc
V
out
= V
cc
+ A
v
V
ac
2
Figure 13: Current Noise Density vs. Feedback Resistance
Figure 10: Single Supply Operation
錚?/div>
e
n
錚?/div>
4
kT
2
i
ni
=
i
n
+
錚?/div>
+
錚?/div>
R
f
錚?/div>
R
f
錚?/div>
2
Low Noise Transimpedance Amplifier
The circuit of Figure 11 implements a low-noise transim-
pedance amplifier commonly used with photo-diodes.
The transimpedance gain is set by R
f
. The simulated
frequency response is shown in Figure 12 and shows
the influence C
f
has over gain flatness. Equation 4
provides the total input current noise density (i
ni
) equa-
tion for the basic transimpedance configuration and is
plotted against feedback resistance (R
f
) showing all
contributing noise sources in Figure 13. This plot indi-
cates the expected total equivalent input current noise
density (i
ni
) for a given feedback resistance (R
f
). The total
equivalent output voltage noise density (e
no
) is i
ni
鈭桼
f
.
7
Equation 4: Total Equivalent Input Refered Current
Very Low Noise Figure Amplifier
The circuit of Figure 14 implements a very low Noise
Figure amplifier using a step-up transformer combined
with a CLC425 and a CLC404. The circuit is configured
with a gain of 35.6dB. The circuit achieves measured
Noise Figures of less than 2.5dB in the 10-40MHz
region. 3
rd
order intercepts exceed +30dBm for frequen-
cies less than 40MHz and gain flatness of 0.5dB is measured
in the 1-50MHz pass bands. Application Note OA-14 provides
greater detail on these low Noise Figure techniques.
http://www.national.com

5962-9325901 PDF文件相關(guān)型號

CLC425,CLC425A8B,CLC425AJE,CLC425AJM5,CLC425AJP,CLC425ALC,CLC425AMC

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