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AWT6111 Datasheet Download - ANADIGICS

Номер произв AWT6111
Описание CDMA/AMPS Power Amplifier
Производители ANADIGICS
логотип ANADIGICS логотип 



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AWT6111 Даташит, Описание, Даташиты
AWT6111
CDMA/AMPS Power Amplifier
Application Note - Rev 0
General Description
The AWT6111 is a hetero-junction bipolar transistor
(HBT) amplifier designed for the CDMA cellular
handset. The frequency band of operation is
824-849 MHz. The AWT6111 is designed to operate
from a single lithium-ion (Li-ion) battery. The amplifier
input and output are matched to provide optimum
performance in a 50 system. Minimal external
components are required for proper RF bypassing.
The tantalum capacitors, C8 and C9, are not required.
Landings should be made available on the printed
circuit board (PCB) as a precaution.
Table 1: AWT6111 Module Pin Description
PIN NAME DESCRIPTION
NOTES
1 VCC1 Bias supply to 1st stage collector 3.0 - 4.2 V
2
RFIN
RF Input
Use 50 transmission line
3
VREF Reference supply to base bias
2.75 - 3.1 V
4 VMODE Mode select
0 V for high power mode,
2.7 V for low power mode
5 VCC2 Bias supply to 2nd stage collector 3.0 - 4.2 V
6 RFOUT RF Output
Use 50 transmission line
7 GND Supply ground
DC ground
Figure 1: Application Schematic
04/2002
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AWT6111 Даташит, Описание, Даташиты
AWT6111
Application Board
The application board was designed with GETEK material and 0.014" thickness.
Figure 2: Evaluation Board Layout
Notes:
1. Copper trace width is 0.0257 ±0.001".
2. Relative dielectric constant is 4.37 at 1 GHz.
3. Dielectric thickness is 0.014 ±0.001".
Table 2: Parts List
DESCRIPTION VALUE
FUNCTION
C1
0.01 uF
Bypass
C2
0.01 uF
Bypass
C4
0.01 uF
Bypass
C8
22 uF, tant.
Bypass
C9
22 uF, tant.
Bypass
C3, C5, C6 & C7 not used.
Designations same as engineering fixture.
2 Application Note - Rev 0
04/2002
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AWT6111 Даташит, Описание, Даташиты
Minimum Bench Requirements
The following minimum equipment is required for
proper power amplifier operation.
1. Spectrum Analyzer
2. Three power supplies
3. CDMA function generator
4. RF filter (Surface Acoustic Wave-SAW)
5. Isolator
6. RF power meter
7. Coupler(s)
Turn On Procedures
Upon receiving the amplifier, the characterization
sheet should be reviewed for the appropriate bias
conditions. Review the evaluation board drawing
prior to connection of the proper bias pins on the
application board.
AWT6111
Other Recommendations
In order to maximize performance in a CDMA system,
the AWT6111 achieves full output power (+28.5dBm
in digital mode and +31dBm in analog mode) while
operating in low power mode. This minimizes
quiescent current (47 mA typical) and eliminates
the need for mode switching between high and low
power or between analog and digital modes of
operation. Applying logic low (0 V) to both VREF and
VMODE pins, places the amplifier in shutdown
(standby) mode. To minimize external switch
requirements, the VREF and VMODE lines can be tied
together. IMODE is only ~300 uA, therefore tying it to
the VREF line doesn’t significantly increase the
current requirements on the switched line.
1. Be sure to connect the amplifier to 50 RF in/
out cables.
2. No RF power should be applied to the amplifier
prior to biasing.
3. Attach VCC1 and VCC2 first; then VREF and VMODE.
4. Turn the VREF supply to +2.85 V. Observe current
draw of approximately 5 mA.
5. Turn on the VCC1 and VCC2 supply to +3.5 V.
Observe current of ~100 mA from VCC supply.
6. Turn on RF power applying +5 dBm. Gradually
increase until the appropriate power level is
obtained from the output (28.5 - 29 dBm in
digital mode, 31 dBm in analog mode).
7. Perform measurements.
Layout Considerations
A sufficient number of holes (QTY 12 - 0.2mm
diameter plated through hole) should be placed
under the module in order to channel the heat
properly. In addition, contact should be made
between the PA slug located under the amplifier and
the board. For hand assembly of the board, place
sufficient bonding paste so that contact is made
between the PA and ground. For large volume
assembly, please refer to the solder profile
recommendations application note. For RF in and
out provide 50 transmission lines.
Application Note - Rev 0
04/2002
3
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