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AP561 Datasheet(PDF) 6 Page - TriQuint Semiconductor

Part No. AP561
Description  2.3-2.9 GHz WiMAX 8W Power Amplifier
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Maker  TRIQUINT [TriQuint Semiconductor]
Homepage  http://www.triquint.com
Logo TRIQUINT - TriQuint Semiconductor

AP561 Datasheet(HTML) 6 Page - TriQuint Semiconductor

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Specifications and information are subject to change without notice
WJ Communications, Inc
• Phone 1-800-WJ1-4401 • FAX: 408-577-6621 • e-mail: sales@wj.com • Web site: www.wj.com , www.TriQuint.com
Page 6 of 8 May 2008
AP561
2.3-2.9 GHz WiMAX 8W Power Amplifier
2.3 – 2.9 GHz Application Note: Changing Icq Biasing Configurations
The AP561 can be configured to operate with lower bias current by varying the bias-adjust resistor R2. (Table 1) The
recommended circuit configurations shown previously in this datasheet have the device operating with a 300 mA as the
quiescent current (ICQ). This biasing level represents a tradeoff in terms of EVM and efficiency. Lowering ICQ will improve
upon the efficiency of the device, but degrade the EVM performance. Measured data shown in the plots below represents the
AP561 measured and configured for 2.4 GHz applications. It is expected that variation of the bias current for other frequency
applications will produce similar performance results.
Table 1 : Reduced Current Operation
Icq
(mA)
R2
(Ω)
VPD
(V)
IREF
(V)
300
330
5
2.85
280
336
5
2.81
260
240
5
2.78
240
343
5
2.76
220
348
5
2.73
200
351
5
2.71
EVM vs. Output Average Power vs. Icq
f=2.4 GHz
0
1
2
3
4
28
29
30
31
32
Pout (dBm)
200mA
220mA
240mA
260mA
280mA
300mA
Efficiency vs. Output Average Power vs Icq
f=2.4 GHz,
8
10
12
14
16
18
28
29
30
31
32
Pout (dBm)
200mA
220mA
240mA
260mA
280mA
300mA
r


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