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| 型號(hào)： | 5962-9752001MPA |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1 CHANNEL, VIDEO AMPLIFIER, CDIP8 |
| 封裝： | CERDIP-8 |
| 文件頁(yè)數(shù)： | 3/18頁(yè) |
| 文件大?。?/td> | 509K |
| 代理商： | 5962-9752001MPA |
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Application Division (Continued)
dBm is the power in mW, at the load, expressed in dB.
Realized third-order output distortion is highly dependent
upon the external circuit. Some of the common external
circuit choices that improve 3
rd order distortion are:
short and equal return paths from the load to the
supplies.
de-coupling capacitors of the correct value.
higher load resistance
a lower ratio of the output swing to the power supply
voltage.
Dynamic Range (Noise)
In RF applications, noise is frequently specified as Noise
Figure (NF).
Figure 7 plots NF for the CLC449 at a gain of
10, with a feedback resistor R
f of 100, and with no input
matching resistor. The minimum Noise Figure (2.5dB) for
these conditions occurs when the source resistance equals
700
.
The CLC449 noise model in
Figure 8 is used to develop the
equation below.
The equation for Noise Figure (NF) is:
NF
10LOG
e
i R
4 TR
i
R ||R
4 T R ||R
4TR
ni
bn s
2
s
bi
f
g
2
f
g
s
2
=
+
() ++
() +
kk
k
Where:
R
s is the source resistance at the non-inverting input.
There is no matching resistor from the input to ground.
e
ni,ibn,ibi are the voltage and current noise density terms
(see in the Distortion and Noise Response sub-section
of the Electrical Characteristics section).
4kT = 16 x 10
21J, T= 290K.
R
f is the feedback resistor and Rg is the gain setting
resistor.
Printed Circuit Board Layout
High Frequency op amp performance is strongly dependent
on proper layout, proper resistive termination and adequate
power supply decoupling. The most important layout points
to follow are:
Use a ground plane
Bypass power supply pins with monolithic:
ceramic capacitors of about 0.1F placed less than 0.1”
(3mm) from the pin
tantalum capacitors of about 6.8F for large signal
current swings or improved power supply noise rejection;
we recommend a minimum of 2.2 F for any circuit
Minimize trace and lead lengths for components between
the inverting and output pins
Remove ground plane underneath the amplifier package
and 0.1” (3mm) from all input/output pads
If parts must be socketed, always use flush-mounted
socket pins instead of high profile sockets.
Evaluation boards are available for proto-typing and
measurements. Additional layout information is available in
the evaluation board literature.
Low Noise Composite Amp With Input Matching
The composite circuit shown in
Figure 9 eliminates the need
for a matching resistor to ground at the input. By connecting
two amplifiers in series, the first non-inverting and second
inverting, an overall inverting gain is realized. The feedback
resistor (R
f)
connected from the output of the second
amplifier to the non-inverting input of the first amplifier closes
the loop, and generates a set input resistance (R
in) that can
be matched to R
s. This resistor generates less noise than a
matching resistor to ground at the input.
The input resistance and DC voltage gain of the amplifier
are:
R
1G
, where G
1
R
V
G
R
RR
in
ff 1
g1
f2
g2
o
s
in
s
=
+
=+
=
+
Match the source resistance by setting: R
in =Rs
Noise voltage produced by R
f, referred to the source Vs is:
Noise
Figure
(dB)
Source Resistance (
)
20
15
0
10
100
10000
10
5
1000
DS012715-38
FIGURE 7. Noise Figure Plot
+
-
CLC449
en
Vo
Rs
ibn
+
-
Vs
Rf
Rg
*
ibi
*
DS012715-39
FIGURE 8. CLC449 Noise Model
+
-
CLC449
Rf
Vo
Rg2
-
+
20
CLC449
Rf2
Rf1
Rg1
Rin
Vs
Rs
+
-
DS012715-41
FIGURE 9. Composite Amplifier
CLC449
www.national.com
11
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