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0026091
3
MAAL-011207-QR3000
Rev. V4
Low Noise Amplifier
0.15 - 6 GHz
Biasing Options
The MAAL
-
011207 bias can be set in 2 different ways: using only V
DD
or using separate V
DD
and V
BIAS
voltages.
A separate V
BIAS
voltage allows pin 5 (V
BIAS
) to be used as an enable pin to power the device up and
down during operation.
For both bias methods select the value of R
BIAS
to achieve the desired current based on the tables on page 4, and
use DC blocks at pin 2 (RF
IN
) and pin 7 (RF
OUT
/ V
DD
).
DC Block
RF
OUT
RF
IN
V
DD
DC Block
R
BIAS
RF Choke
Bypass
2
7
5
Biasing Option
-
Separate V
DD
and V
BIAS
Voltages (V
BIAS
≤
V
DD
)
To use separate V
DD
and V
BIAS
voltages, connect pin 7 (RF
OUT
/ V
DD
) to V
DD
through an RF choke inductor and
connect pin 5 (V
BIAS
) to V
BIAS
through bias resistor R
BIAS
as shown in Figure 2. Typical current (I
BIAS
) draw for pin 5
(V
BIAS
)
is 1.4 mA @ V
BIAS
= 3 V and 1 µA @ V
BIAS
= 0 V.
Typical current (I
DD
) draw for pin 7 (RF
OUT
/ V
DD
) is
< 1 µA @ V
BIAS
= 0 V.
Biasing Option
-
V
DD
only
To use only V
DD
, connect pin 7 (RF
OUT
/ V
DD
) to V
DD
through an RF choke inductor and connect pin 5 (V
BIAS
) to V
DD
through bias resistor R
BIAS
as shown in Figure 1.
Figure 1
Figure 2
DC Block
RF
OUT
RF
IN
V
DD
DC Block
R
BIAS
RF Choke
Bypass
V
BIAS
2
7
5
