AP601 Datasheet, PDF (8/10 Pages) WJ Communication. Inc. – High Dynamic Range 1.8W 28V HBT Amplifier

AP601
High Dynamic Range 1.8W 28V HBT Amplifier
2110-2170 MHz Application Note: Changing Icq Biasing Configurations
The AP601 can be configured to operate with lower bias current by varying the bias-adjust resistor – R2. The recommended
circuit configurations shown previously in this datasheet have the device operating with a 40 mA as the quiescent current (I_CQ).
This biasing level represents the best tradeoff in terms of linearity and efficiency. Lowering I_CQ will improve upon the
efficiency of the device, but degraded linearity. Increasing I_CQ has nominal improvement upon the linearity, but will degrade
the device’s efficiency. Measured data shown in the plots below represents the AP601 measured and configured for 2.14 GHz
applications. It is expected that variation of the bias current for other frequency applications will produce similar performance
results.
Icq
R2 V_PD PIN_V_PD
Thermal Rise vs. Output Power vs. Icq
(mA) (Ω) (V) (V)
80
Vcc = 28V
10 12k 5
2.50
10 mA
20 5.44k 5
2.58
20 mA
60
30 3.48k 5
2.63
30 mA
40 mA
C7
40 2.61k 5
2.68
40
50 mA
1000pF
50 2.06k 5
2.72
60 mA
60 1.67k 5
2.77
20
70 mA
3,3pF
C22
C5
C19
1.2pF
2.4pF
1.8pF
70 1.42k 5
2.81
80 mA
0
80 1.22k 5
2.85
14 16 18 20 22 24 26
Output Power (dBm)
ACLR1 vs. Output Power vs. Icq
WCDMA, Vcc = 28V, 2140 MHz, 25 ˚C
-30
10 mA
20 mA
30 mA
40 mA
50 mA
60 mA
70 mA
80 mA
-40
-50
-60
18
15
20
22
24
Average Output Power (dBm)
Gain vs. Output Power vs. Icq
CW tone, Vcc = 28V, 2140 MHz, 25 ˚C
14
13
12
11
10
18
10 mA
50 mA
20 mA
60 mA
30 mA
70 mA
40 mA
80 mA
22
26
30
Output Power (dBm)
Efficiency vs. Output Power vs. Icq
WCDMA, Vcc = 28V, 2140 MHz, 25 ˚C
120
10 mA
20 mA
30 mA
40 mA
100
50 mA
60 mA
70 mA
80 mA
80
60
Efficiency vs. Output Power vs. Icq
WCDMA, Vcc = 28V, 2140 MHz, 25 ˚C
30
10 mA 20 mA
25
30 mA 40 mA
50 mA 60 mA
20
70 mA 80 mA
15
40
10
20
5
0
0
26
18
20
22
24
26
18
20
22
24
26
Average Output Power (dBm)
Average Output Power (dBm)
34
30
26
22
18
34
4
Output Power vs. Input Power vs. Icq
CW tone, Vcc = 28V, 2140 MHz, 25 ˚C
Efficiency vs. Output Power vs. Icq
CW tone, Vcc = 28V, 2140 MHz, 25 ˚C
60
10 mA
20 mA
50
30 mA
40 mA
10 mA
30 mA
20 mA
40 mA
40
50 mA
60 mA
70 mA
80 mA
30
20
50 mA 60 mA
10
70 mA 80 mA
0
8
12
16
20
18
22
26
30
34
Input Power (dBm)
Output Power (dBm)
Specifications and information are subject to change without notice
WJ Communications, Inc • Phone 1-800-WJ1-4401 • FAX: [phone] • e-mail: [e-mail] • Web site: www.wj.com
Page 8 of 10 May 2007 ver 1