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參數(shù)資料
| 型號： | CGY180 |
| 廠商： | SIEMENS A G |
| 元件分類： | 衰減器 |
| 英文描述： | GaAs MMIC (Power amplifier for DECT and PCS application Fully integrated 3 stage amplifier Operating voltage range: 2.7 to 6 V) |
| 中文描述： | RF/MICROWAVE NARROW BAND MEDIUM POWER AMPLIFIER |
| 文件頁數(shù)： | 14/15頁 |
| 文件大?。?/td> | 278K |
| 代理商： | CGY180 |
GaAs MMIC
CGY 180
_________________________________________________________________________________________________________
Siemens Aktiengesellschaft
pg. 14/15
21.02.96
HL EH PD 21
APPLICATION - HINTS
1. CW - capability of the CGY180
1.1 VD = 3 V
Proving the possibility of CW - operations there must be known the total power dissipation of the
device. This value can be found as a function of the temperature in the datasheet (page 8/14). The
CGY180 has a maximum total power dissipation of Ptot = 2.3 W.
As an example we take the operating point with a drain voltage VD = 3 V. The possible ratings of
the
drain
current
adjusted
by
the
internal
( V
G
= -4 V, V
TR
= 0 V ) are shown in the following table.
current
control
of
the
CGY180
Min.
325
Typ.
450
Max.
650
ID / mA
At worst case you see a current of ID = 650 mA. So the maximum DC - power can be calculated to
P
V
I
W
DC
D
D
=
=
195
.
This value is smaller than 2.3W and CW - operation is possible.
1.2 VD = 4 V
If you want to use the whole capability of the CGY180, you must consider the power added
efficiency PAE. You want to take an operation point of V
D
= 4 V. Now there will be a higher
current than at V
D
= 3 V. We assume a current of ID = 650 mA and a PAE = 35 %. With these
values the DC - power is P
DC
= 2.6 W. That exeeds the PtotDC of 2.3 W. Decoupling RF-Power
from the CGY180 results in less power dissipation of the device. This is directly correlated with the
achieved PAE. To calculate total power dissipation use the formula
:
P
P
totDC
DC
=
(
)
PAE
1
.
P
tot
for the used operating point shown above will be
P
W
W
tot
=
=
2 6
.
1 0 35
(
169
.
.
)
.
It is possible to use the CGY180 for CW - operations up to a drain voltage of V
D
= 4 V, if at the
same time a PAE of 35% is achieved.
The calculation can be done for any operating point to prove the capability of CW - operation.
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