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參數(shù)資料
| 型號： | SA5204AD |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 衰減器 |
| 英文描述： | Wide-band high-frequency amplifier |
| 中文描述： | 0 MHz - 350 MHz RF/MICROWAVE WIDE BAND LOW POWER AMPLIFIER |
| 文件頁數(shù)： | 8/14頁 |
| 文件大?。?/td> | 190K |
| 代理商： | SA5204AD |
Philips Semiconductors
Product specification
NE/SA5204A
Wide-band high-frequency amplifier
1992 Feb 25
8
PC BOARD MOUNTING
In order to realize satisfactory mounting of the NE5204A to a PC
board, certain techniques need to be utilized. The board must be
double-sided with copper and all pins must be soldered to their
respective areas (i.e., all GND and V
CC
pins on the package). The
power supply should be decoupled with a capacitor as close to the
V
CC
pins as possible, and an RF choke should be inserted between
the supply and the device. Caution should be exercised in the
connection of input and output pins. Standard microstrip should be
observed wherever possible. There should be no solder bumps or
burrs or any obstructions in the signal path to cause launching
problems. The path should be as straight as possible and lead
lengths as short as possible from the part to the cable connection.
Another important consideration is that the input and output should
be AC-coupled. This is because at V
CC
=6V, the input is
approximately at 1V while the output is at 3.1V. The output must be
decoupled into a low-impedance system, or the DC bias on the
output of the amplifier will be loaded down, causing loss of output
power. The easiest way to decouple the entire amplifier is by
soldering a high-frequency chip capacitor directly to the input and
output pins of the device. This circuit is shown in Figure 18. Follow
these recommendations to get the best frequency response and
noise immunity. The board design is as important as the integrated
circuit design itself.
SCATTERING PARAMETERS
The primary specifications for the NE5204A are listed as
S-parameters. S-parameters are measurements of incident and
reflected currents and voltages between the source, amplifier, and
load as well as transmission losses. The parameters for a two-port
network are defined in Figure 19.
NE5204A
V
OUT
V
IN
V
CC
AC
COUPLING
CAPACITOR
RF CHOKE
DECOUPLING
CAPACITOR
AC
COUPLING
CAPACITOR
SR00210
Figure 18. Circuit Schematic for
Coupling and Power Supply Decoupling
Actual S-parameter measurements using an HP network analyzer
(model 8505A) and an HP S-parameter tester (models 8503A/B) are
shown in Figure 20.
Values for the figures below are measured and specified in the data
sheet to ease adaptation and comparison of the NE/SA/SE5204A to
other high-frequency amplifiers.
The most important parameter is S
21
. It is defined as the square root
of the power gain, and, in decibels, is equal to voltage gain as
shown below:
Z
D
=Z
IN
=Z
OUT
for the NE/SA/SE5204A
P
IN
V
IN
Z
D
2
P
OUT
V
OUT
Z
D
2
P
OUT
P
IN
V
OUT
Z
D
2
V
IN
Z
D
2
V
OUT
V
IN
2
2
P
I
NE5204A
Z
D
P
I
=V
I2
P
I
=Insertion Power Gain
V
I
=Insertion Voltage Gain
Measured value for the
NE/SA/SE5204A = |S
21
|
2
= 100
P
OUT
P
IN
V
OUT
V
IN
P
I
| S
21
|
2
100
and V
I
P
I
S
21
10
In decibels:
P
I(dB)
=10 Log | S
21
|
2
= 20dB
V
I(dB)
= 20 Log S
21
= 20dB
∴
P
I(dB)
= V
I(dB)
= S
21(dB)
= 20dB
Also measured on the same system are the respective voltage
standing wave ratios. These are shown in Figure 21. The VSWR
can be seen to be below 1.5 across the entire operational frequency
range.
Relationships exist between the input and output return losses and
the voltage standing wave ratios. These relationships are as follows:
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相關代理商/技術參數(shù) |
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| SA5204AN | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Wide-band high-frequency amplifier |
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| SA5205A | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Wide-band high-frequency amplifier |
| SA5205AD | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Wide-band high-frequency amplifier |
| SA5205AN | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Wide-band high-frequency amplifier |
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