10
AMMP-6222 Application and Usage
Figure 19. Low Current, Low Output Power State
Figure 20. High Current, High Output Power State
Figure 21. Evaluation/Test Board (available to qualied customer request)
Figure 22. Simplied High Linearity LNA Schematic
Biasing and Operation
The AMMP-6222 is normally biased with a positive
drain supply connected to the VDD pin through
bypass capacitor as shown in Figures 19 and 20. The
recommended drain supply voltage for general usage is
4V and the corresponding drain current is approximately
120mA. It is important to have 0.1uF bypass capacitor and
the capacitor should be placed as close to the component
as possible. Aspects of the amplier performance may
be improved over a narrower bandwidth by application
of additional conjugate, linearity, or low noise (Topt)
matching.
For receiver front end low noise applications where high
power and linearity are not often required, the AMMP-
6222 can be set in low current state when pin # 5 is open
as shown in Figure 19. In this conguration, the bias
current is approximately 90mA, 95mA and 100mA for 3V,
4V and 5V respectively.
In applications where high output power and linearity
are often required such as LO or transmitter drivers, the
AMMP-6222 can be selected to operate at its highest
output power by grounding pin # 5 as shown in Figure 20.
At 5V, the amplier can provide Psat of ~ 20dBm. The bias
current in this conguration is 115mA, 120mA and 125mA
for 3V, 4V and 5V respectively.
Refer the Absolute Maximum Ratings table for allowed DC
and thermal conditions.
Vdd
OUT
IN
123
4
5
67
8
0.1uF
100pF
Vdd
OUT
IN
123
4
5
67
8
0.1uF
100pF
Vd2
Ou
In
Matching
Network
Matching
Network
SELECT
Vd1
