AH215 / ECP100G
1 Watt, High Gain HBT Amplifier
Product Information
Application Note: Reduced Bias Configurations
The AH215 / ECP100 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 AH215 /
ECP100 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.
AH215-PCB2140 Performance Data
R1
(ohms)
51
68
100
130
180
Icq
(mA)
450
400
350
300
250
Pdiss
(W)
2.25
2.00
1.75
1.50
1.25
P1dB
(dBm)
+31.0
+30.9
+30.8
+30.6
+30.5
OIP3
(dBm)
+47.1
+46.4
+46.4
+45.5
+43.6
11.5
11
2.14GHz Gain vs. Output Power
50
2.14GHz OIP3 vs. Output Power per Tone
45
10
9.5
9
8.5
16
OIP3 (dBm)
Gain (dB)
10.5
Idq=450mA 'Class A'
Idq=400mA
Idq=350mA
Idq=300mA
Idq=250mA
40
Idq=450mA 'Class A'
Idq=400mA
35
Idq=350mA
Idq=300mA
Idq=250mA
30
18
20
22
24
26
28
30
32
10
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=450mA 'Class A'
Idq=400mA
Idq=350mA
Idq=300mA
Idq=250mA
-35
Idq=450mA 'Class A'
-40
Idq=400mA
Idq=300mA
Idq=250mA
ACLR (dBc)
-45
-50
-55
-60
-65
12
PAE (%)
Idq=350mA
10
1
14
16
18
20
22
24
16
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. ]
