AH312 / ECP200G
2 Watt, High Linearity InGaP HBT Amplifier
Product Information
Application Note: Reduced Bias Configurations
The AH312 / ECP200 can be configured to be operated with lower bias current by varying the bias-adjust resistor – R1. The
recommended circuit configurations shown previously in this datasheet have the device operating in Class A operation.
Lowering the current has little effect on the gain, OIP3, and P1dB performance of the device, but will slightly lower the
ACLR/ACPR performance of the device as shown below. An example of the measured data below represents the AH312 /
ECP200 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.
AH312-PCB2140 Performance Data
R1
(ohms)
15
22
43
62
110
Icq
(mA)
800
700
600
500
400
Pdiss
(W)
4.0
3.5
3.0
2.5
2.0
P1dB
(dBm)
+33.3
+33.3
+33.1
+33.0
+32.9
OIP3
(dBm)
+51.4
+50.9
+50.9
+50.7
+47.3
10.2
2.14GHz Gain vs. Output Power
55
2.14GHz OIP3 vs. Output Power per Tone
9.8
50
9.4
OIP3 (dBm)
Gain (dB)
Idq=800mA 'Class A'
9
45
Idq=800mA 'Class A'
Idq=700mA
Idq=700mA
Idq=600mA
8.6
40
Idq=600mA
Idq=500mA
Idq=500mA
Idq=400mA
35
18
20
22
24
26
28
30
32
34
10
8.2
Idq=400mA
12
14
16
18
20
22
24
Output Power (dBm)
W-CDMA ACLR vs. Output Channel Power
3GPP W-CDMA, Test Model 1 + 64 DPCH, ±5 MHz offset
Power Out per Tone (dBm)
100
CW PAE vs. Output Power
Idq=800mA 'Class A'
Idq=700mA
Idq=600mA
-35
-40
Idq=800mA 'Class A'
Idq=700mA
Idq=500mA
Idq=400mA
Idq=600mA
ACLR (dBc)
-45
-50
-55
-60
-65
14
PAE (%)
Idq=500mA
Idq=400mA
10
1
16
18
20
22
24
26
18
20
22
24
26
28
30
32
W-CDMA Channel Power Out (dBm)
CW Tone Power Out (dBm)
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
Page 6 of 9 June 2005
WJCI [ WJ COMMUNICATION. INC. ]
