cgy181- ETC-unknow, cgy181- Datasheet - Page 14

• Manufacturer Part Number: cgy181-
• Description: Gaas Mmic Power Amplifier Pcn/pcs Applications Fully Integrated Stage Amplifier
• Manufacturer: ETC-unknow

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APPLICATION - HINTS
1. CW - capability of the CGY181
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 temperature in the datasheet (page 12). The
CGY181 has a maximum total power dissipation of P tot = 5 W.
As an example we take the operating point with a drain voltage V D = 3.6 V and a typical drain
current of I D =1.2A. So the maximum DC - power can be calculated to:
This value is smaller than 5W and CW - operation is possible.
By decoupling RF power out of the CGY181 the power dissipation of the device can be further
reduced. Assuming a power added efficiency PAE of 35 % the total power dissipation P tot can be
calculated using the following formula:
2. Operation without using the internal current control
If you don' t want to use the internal current control, it is recommended to connect the negative
gate voltage at pin 2 (V TR ) instead of pin 1 (V G ). In that case V G is not connected.
3. Biasing and use considerations
Biasing should be timed in such a way the that gate voltage (V G ) is always applied before the drain
voltages (V D ), and when returning to the standby mode, the drain voltages have be removed before
the gate voltage.
Siemens Aktiengesellschaft
P
tot
P
DC
(
1
PAE
GaAs MMIC
P
DC
)
V I
pg. 14/14
D
4 32
.
D
W
4 32
(
.
1 0 35
W
. )
.
2 808
.
CGY 181
W
HL EH PD 21
01.02.96