AWT6278
APPLICATION INFORMATION
To ensure proper performance, refer to all related logic level (see Operating Ranges table) to the VMODE
Application Notes on the ANADIGICS web site: voltages. The Bias Control table lists the recommended
http://www.anadigics.com
modes of operation for various applications.
Shutdown Mode
Three operating modes are recommended to optimize
current consumption. High Bias/High Power operating
mode is for POUT levels > 16 dBm. At ~16dBm - 7
dBm, the PA should be “Mode Switched” to Medium
Power Mode. For POUT levels < ~8 dBm, the PAcan be
switched to Low Power Mode for even lower quiescent
current consumption.
The power amplifier may be placed in a shutdown
mode by applying logic low levels (see Operating
Ranges table) to the VENABLE, VMODE1 and VMODE2
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
MODE
APPLICATION
V
ENABLE
V
MODE1
V
MODE2
V
CC
V
BATT
LEVELS
WCDMA - low power
(Low Bias Mode)
< +8 dBm
Low
Low
High
+2.4 V +2.4 V +2.4 V
3.2 - 4.2 V
3.2 - 4.2 V
3.2 - 4.2 V
> 3.2 V
> 3.2 V
> 3.2 V
WCDMA - med power
(Medium Bias Mode)
7 POUT <
+16 dBm
+2.4 V +2.4 V
0 V
0 V
WCDMA - high power
(High Bias Mode)
> +16 dBm
+2.4 V
0 V
Optional lower VCC in
low power mode
< +7 dBm
Low
+2.4 V +2.4 V
0 V 0 V
2.4 V
0 V
1.5 V
> 3.2 V
> 3.2 V
Shutdown
-
Shutdown
3.2 - 4.2 V
VBATT
VCC
C1
C3
C4
C5
0.01µF
0.01µF
2.2µF ceramic
2.2 µF
1
10
VBATT
VCC
2
9
8
7
6
RF IN
VMODE2
VMODE1
VENABLE
RFIN
GND
3
RFOUT
RF OUT
VMODE2
4
GND
VMODE1
5
VENABLE
GND
GND
at slug
C2
0.01µF
10K
Optional
pull-down
Figure 3: Application Circuit Schematic
Data Sheet - Rev 2.2
5
11/2008
ANADIGICS [ ANADIGICS, INC ]
