mga-83563-blk Avago Technologies, mga-83563-blk Datasheet - Page 17

• Manufacturer Part Number: mga-83563-blk
• Description: +22 Dbm Psat 3v Power Amplifier For 0.5? 6 Ghz Applications
• Manufacturer: Avago Technologies

Figure 39. Completed MGA-83563 Amplifier Assembly.
Use of the MGA-83563 for
Linear Applications
Due to the thermal limitations
covered in the “Thermal Design
for Reliability” section, the MGA-
83563 is best suited for use as a
saturated mode amplifier. The
MGA-83563 can however be used
with reduced output power
performance by lowering the
supply voltage.
Some saturated amplifier applica-
tions may also benefit from
operation at reduced V
purpose of reducing current drain
and extending battery life.
P
2.5 GHz and 900 MHz circuit
examples are shown in Figures 40
and 41, respectively. The methods
presented in the “Thermal Design
for Reliability” section may be
used to arrive at a maximum
supply voltage that corresponds
to the desired MTTF goal.
1dB
and P
sat
vs. V
d
MGA-83-A
IN
+V
for the
d
d
for the
L1
C5
L4
83
The P
40 and 41 is taken from the
example amplifiers tuned for
maximum P
higher with linear tuning. When
designing for linear applications,
the value for the interstage
inductor L2 is taken from Plot A
of Figure 47 in the Appendix.
The data in Tables 2– 4 shows
that some increase in device
current occurs as the output
power approaches P
ance should be made in the
thermal analysis for the increased
P
or near P
Figure 40. Output Power vs. Supply Voltage for the 2.5 GHz Amplifier.
L3
diss
25.00
23.00
21.00
19.00
17.00
15.00
13.00
11.00
C2
9.00
7.00
5.00
L2
C4
if the circuit is to be used at
1.00
1dB
C3
OUT
1dB
power plotted in Figures
1.25
sat
.
. P
1.50
1dB
P
P
sat
1dB
1dB
will be
1.75
. Allow-
SUPPLY VOLTAGE, V
2.00
2.25
Operation at Higher Supply
Voltages
While the MGA-83563 is designed
primarily for use in +3 volt
applications, the output power
can be increased by using a
higher supply voltage. Referring
to Figure 5, the P
increased by up to 1 dB by using a
power supply voltage of
+3.6 volts.
Note: If bias voltages greater than
3 volts are used, appropriate
caution should be given to both
the thermal limits and the Abso-
lute Maximum Ratings.
Hints and Troubleshooting
Oscillation
Unconditional stability of the
MGA-83563 is dependent on
having good grounding. Inad-
equate device grounding or poor
PCB layout techniques could
cause the device to be potentially
unstable. In a multistage RFIC
such as the MGA-83563, feedback
through bias lines supplying
voltage to both stages can lead to
oscillation. It is important to well
bypass the connections to bias
supply to ensure stable operation.
2.50
d
17
(V)
2.70
3.00
sat
3.30
can be
3.50