AWT6277R
APPLICATION INFORMATION
logic level (see Operating Ranges table) to the VMODE
voltage. The Bias Control table lists the recommended
modes of operation for various applications.
To ensure proper performance, refer to all related
Application Notes on the ANADIGICS web site:
http://www.anadigics.com
Three operating modes are recommended to optimize
current consumption. High Bias/High VCC operating
mode is for POUT levels > 16 dBm.At ~16dBm - 7 dBm,
the PA should be “Mode Switched” to Low Bias Mode.
For POUT levels < ~7 dBm, the VCC can be switched
to 1.5 V (Low Bias Mode is also used for this POUT
range).
Shutdown Mode
The power amplifier may be placed in a shutdown
mode by applying logic low levels (see Operating
Ranges table) to both the VREF and VMODE voltages.
Bias Modes
The power amplifier may be placed in either a Low Bias
mode or a High Bias mode by applying the appropriate
Table 5: Bias Control
P
OUT
BIAS
APPLICATION
LEVELS
MODE
V
REF
V
MODE
V
CC
WCDMA - low power
<+7 dBm
Low
Low
+2.85 V +2.85 V
+2.85 V +2.85 V
+1.5
+3.4
+3.4
-
WCDMA - med power 7 < POUT < +16 dBm
WCDMA - high power
>+16 dBm
-
High
+2.85 V
0 V
0 V
Shutdown
Shutdown
0 V
VCC1
VCC2
C1
0.01µF
C3
C4
2.2µF ceramic
0.01µF
1
10
VCC
VCC
2
9
RF IN
RFIN
GND
3
8
GND
RFOUT
RF OUT
4
7
GND
VMODE
VMODE
5
6
VREF
VREF
GND
GND
at slug
C2
0.01µF
Figure 3: Application Circuit Schematic
Data Sheet - Rev 2.1
5
11/2008
ANADIGICS [ ANADIGICS, INC ]
