AP561-F_15 Datasheet, PDF (12/17 Pages) TriQuint Semiconductor – 0.7-2.9 GHz 8W HBT Power Amplifier

AP561-F
0.7-2.9 GHz 8W HBT Power Amplifier
Reference Design 2500-2700 MHz: Changing Icq Biasing Configurations
The AP561 can be configured to operate with lower bias current by varying the bias-adjust resistor R2. (Error! Not a
valid bookmark self-reference.) The recommended circuit configuration has the device operating with a 300 mA as
the quiescent current (I_CQ). This biasing level represents a tradeoff in terms of EVM and efficiency. Lowering I_CQ will
improve upon the efficiency of the device, but degrade the EVM performance. Measured data shown in the plots
below represents the AP561-PCB2500 measured and configured for 2.6GHz applications. It is expected that variation
of the bias current for other frequency applications will produce similar performance results.
Table 1 : Reduced Current Operation
I_CQ (mA) R2 (Ω) V_PD (V) I_REF (V)
300
330
5
2.85
280
336
5
2.81
260
340
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
5
Freq = 2.6 GHz, T= 25ºC
Efficiency vs. Output Average Power vs Icq
30
Freq = 2.6 GHz, T= 25ºC
Power Gain vs. Output Average Power vs. Icq
14
Freq = 2.6GHz, T= 25ºC
200mA
220mA
240mA
4
260mA
280mA
300mA
3
2
25
200mA
220mA
240mA
260mA
280mA
300mA
13
20
12
15
11
10
1
5
10
200mA
220mA
240mA
260mA
280mA
300mA
0
0
9
20
22
24
26
28
30
32
34
20
22
24
26
28
30
32
34
20
22
24
26
28
30
32
Output Power (dBm)
Output Power (dBm)
Output Power (dBm)
Power Gain vs.Frequency vs. Icq
14
Vcc = 12V, T= 25ºC
Icc vs. Output Average Power vs. Icq
700
Freq = 2.6 GHz, T= 25ºC
200mA
220mA
240mA
13
600
260mA
280mA
300mA
12
500
11
400
10
9
2.4
200mA
260mA
220mA
280mA
240mA
300mA
2.5
2.6
2.7
Frequency (GHz)
300
200
2.8
20
22
24
26
28
30
32
34
Output Power (dBm)
Datasheet: Rev B 09-17-13
© 2013 TriQuint
- 12 of 17 -
Disclaimer: Subject to change without notice
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