Specifications and information are subject to change without notice.

WJ Communications, Inc

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Page 6 of 9 June 2005

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)

Icq

(mA)

Pdiss

(W)

P1dB

(dBm)

OIP3

(dBm)

51

450

2.25

+31.0

+47.1

68

400

2.00

+30.9

+46.4

100

350

1.75

+30.8

+46.4

130

300

1.50

+30.6

+45.5

180

250

1.25

+30.5

+43.6

2.14GHz Gain vs. Output Power

8.5

9

9.5

10

10.5

11

11.5

16

18

20

22

24

26

28

30

32

Output Power (dBm)

Idq=450mA 'Class A'

Idq=400mA

Idq=350mA

Idq=300mA

Idq=250mA

2.14GHz OIP3 vs. Output Power per Tone

30

35

40

45

50

10

12

14

16

18

20

22

24

Power Out per Tone (dBm)

Idq=450mA 'Class A'

Idq=400mA

Idq=350mA

Idq=300mA

Idq=250mA

W-CDMA ACLR vs. Output Channel Power

3GPP W-CDMA, Test Model 1 + 64 DPCH, ±5 MHz offset

-65

-60

-55

-50

-45

-40

-35

12

14

16

18

20

22

24

W-CDMA Channel Power Out (dBm)

Idq=450mA 'Class A'

Idq=400mA

Idq=350mA

Idq=300mA

Idq=250mA

CW PAE vs. Output Power

1

10

100

16

18

20

22

24

26

28

30

32

CW Tone Power Out (dBm)

Idq=450mA 'Class A'

Idq=400mA

Idq=350mA

Idq=300mA

Idq=250mA