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參數(shù)資料
| 型號： | AD8350ARZ20 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 放大器 |
| 英文描述： | 1000 MHz RF/MICROWAVE WIDE BAND MEDIUM POWER AMPLIFIER |
| 封裝： | PLASTIC, SOIC-8 |
| 文件頁數(shù)： | 2/16頁 |
| 文件大小： | 227K |
| 代理商： | AD8350ARZ20 |
REV. A
AD8350
–10–
VS
87
6
5
12
34
AD8350
+
–
ENBL (5V)
+VS (5V TO 10V)
0.1 F
CAC
RS
CAC
RSHUNT
RS
RL
Figure 8. Gain Reduction Using Shunt Resistor
VS
87
6
5
12
34
AD8350
+
–
ENBL
(5V)
+VS
(5V TO 10V)
0.1 F
RS
CAC
RS
RL
CAC
RFEXT
Figure 9. Dynamic Gain Reduction
Figure 8 shows a typical implementation of the shunt divider
concept. The reduced input impedance that results from the
parallel combination of the shunt resistor and the input impedance
of the AD8350 adds attenuation to the input signal effectively
reducing the gain. For frequencies less than 100 MHz, the input
impedance of the AD8350 can be modeled as a real 200
resis-
tance (differential). Assuming the frequency is low enough to
ignore the shunt reactance of the input, and high enough such
that the reactance of moderately sized ac-coupling capacitors
can be considered negligible, the insertion loss, IL, due to the
shunt divider can be expressed as:
IL dB
Log
R
RR
R
RR
R
gl
nded
IN
S
IN
SHUNT
IN
SHUNT
S
IN
SHUNT
IN
SHUNT
IN
SHUNT
IN
()
=×
+
=
×
+
=
20
100
10
where
and
sin e e
(3)
The insertion loss and the resultant power gain for multiple
shunt resistor values is summarized in Table I. The source
resistance and input impedance need careful attention when
using Equation 1. The reactance of the input impedance of the
AD8350 and the ac-coupling capacitors need to be considered
before assuming they have negligible contribution. Figure 10
shows the effective power gain for multiple values of RSHUNT for
the AD8350-15 and AD8350-20.
Table I. Gain Adjustment Using Shunt Resistor,
RS = 100
and RIN = 100
Single-Ended
Power Gain–dB
RSHUNT–
IL–dB
AD8350-15
AD8350-20
50
6.02
8.98
13.98
100
3.52
11.48
16.48
200
1.94
13.06
18.06
300
1.34
13.66
18.66
400
1.02
13.98
18.98
RSHUNT –
20
0
GAIN
–
dB
18
16
14
12
10
8
6
4
2
0
100
200
300
400
500
600
700
800
AD8350-20
AD8350-15
Figure 10. Gain for Multiple Values of Shunt Resistance
for Circuit in Figure 8
The gain can be adjusted dynamically by employing external
feedback resistors as shown in Figure 9. The effective attenua-
tion is a result of the lowered input impedance as with the shunt
resistor method, yet there is no additional noise contribution at
the input of the device. It is necessary to use well-matched resistors
to minimize common-mode offset errors. Quality 1% tolerance
resistors should be used along with a symmetric board layout to
help guarantee balanced performance. The effective gain for mul-
tiple values of external feedback resistors is shown in Figure 11.
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