04/2002
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
Figure 1: Application Schematic
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Table 1: AWT6111 Module Pin Description
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.
2
Application Note - Rev 0
04/2002
AWT6111
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
The application board was designed with GETEK material and 0.014" thickness.
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C3, C5, C6 & C7 not used.
Designations same as engineering fixture.
Application Board
Application Note - Rev 0
04/2002
AWT6111
3
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.
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 V
CC1
and V
CC2
first; then V
REF
and V
MODE
.
4. Turn the V
REF
supply to +2.85 V. Observe current
draw of approximately 5 mA.
5. Turn on the V
CC1
and V
CC2
supply to +3.5 V.
Observe current of ~100 mA from V
CC
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.
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 V
REF
and
V
MODE
pins, places the amplifier in shutdown
(standby) mode. To minimize external switch
requirements, the V
REF
and V
MODE
lines can be tied
together. I
MODE
is only ~300 uA, therefore tying it to
the V
REF
line doesn't significantly increase the
current requirements on the switched line.
WARNING
ANADIGICS products are not intended for use in life support appliances, devices or systems. Use of an ANADIGICS
product in any such application without written consent is prohibited.
IMPORTANT NOTICE
ANADIGICS, Inc.
141 Mount Bethel Road
Warren, New Jersey 07059, U.S.A.
Tel: +1 (908) 668-5000
Fax: +1 (908) 668-5132
URL: http://www.anadigics.com
E-mail: Mktg@anadigics.com
ANADIGICS, Inc. reserves the right to make changes to its products or to discontinue any product at any time without
notice. The product specifications contained in Advanced Product Information sheets and Preliminary Data Sheets are
subject to change prior to a product's formal introduction. Information in Data Sheets have been carefully checked and are
assumed to be reliable; however, ANADIGICS assumes no responsibilities for inaccuracies. ANADIGICS strongly urges
customers to verify that the information they are using is current before placing orders.
Application Note - Rev 0
04/2002
4
AWT6111
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