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 8 of 10 May 2007 ver 1

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

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

(mA)

R2

(Ω)

(V)

(V)

10

12k

5

2.50

20

5.44k

5

2.58

30

3.48k

5

2.63

40

2.61k

5

2.68

50

2.06k

5

2.72

60

1.67k

5

2.77

70

1.42k

5

2.81

80

1.22k

5

2.85

Thermal Rise vs. Output Power vs. Icq

Vcc = 28V

0

20

40

60

80

14

16

18

20

22

24

26

Output Power (dBm)

10 mA

20 mA

30 mA

40 mA

50 mA

60 mA

70 mA

80 mA

C19

1.8pF

C5

2.4pF

C22

1.2pF

C7

1000pF

3,3pF

ACLR1 vs. Output Power vs. Icq

WCDMA, Vcc = 28V, 2140 MHz, 25 ˚C

-60

-50

-40

-30

18

20

22

24

26

Average Output Power (dBm)

10 mA

20 mA

30 mA

40 mA

50 mA

60 mA

70 mA

80 mA

Efficiency vs. Output Power vs. Icq

WCDMA, Vcc = 28V, 2140 MHz, 25 ˚C

0

20

40

60

80

100

120

18

20

22

24

26

Average Output Power (dBm)

10 mA

20 mA

30 mA

40 mA

50 mA

60 mA

70 mA

80 mA

Efficiency vs. Output Power vs. Icq

WCDMA, Vcc = 28V, 2140 MHz, 25 ˚C

0

5

10

15

20

25

30

18

20

22

24

26

Average Output Power (dBm)

10 mA

20 mA

30 mA

40 mA

50 mA

60 mA

70 mA

80 mA

Gain vs. Output Power vs. Icq

CW tone, Vcc = 28V, 2140 MHz, 25 ˚C

10

11

12

13

14

15

18

22

26

30

34

Output Power (dBm)

10 mA

20 mA

30 mA

40 mA

50 mA

60 mA

70 mA

80 mA

Output Power vs. Input Power vs. Icq

CW tone, Vcc = 28V, 2140 MHz, 25 ˚C

18

22

26

30

34

4

8

12

16

20

Input Power (dBm)

10 mA

20 mA

30 mA

40 mA

50 mA

60 mA

70 mA

80 mA

Efficiency vs. Output Power vs. Icq

CW tone, Vcc = 28V, 2140 MHz, 25 ˚C

0

10

20

30

40

50

60

18

22

26

30

34

Output Power (dBm)

10 mA

20 mA

30 mA

40 mA

50 mA

60 mA

70 mA

80 mA