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 9 of 11 May 2007 ver 1

AP602

High Dynamic Range 4W 28V HBT Amplifier

2110-2170 MHz Application Note: Changing Icq Biasing Configurations

The AP602 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 AP602 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

(ohms)

(V)

(V)

20

6.00k

5

2.53

40

2.76k

5

2.61

60

1.80k

5

2.67

80

1.33k

5

2.73

100

1.05k

5

2.79

120

859

5

2.84

140

723

5

2.89

160

621

5

2.94

Thermal Rise vs. Output Power vs. Icq

Vcc = 28V

0

20

40

60

80

17

19

21

23

25

27

29

Output Power (dBm)

20 mA

40 mA

60 mA

80 mA

100 mA

120 mA

140 mA

160 mA

See note 6

C22

0.5 pF

See note 5

See note 4

See note 3

C7

100pF

W = .030”

L = .980”

ACLR1 vs. Output Power vs. Icq

WCDMA, Vcc = 28V, 2140 MHz, 25 ˚C

-65

-60

-55

-50

-45

-40

-35

19

21

23

25

27

29

Average Output Power (dBm)

20 mA

40 mA

60 mA

80 mA

100 mA

120 mA

140 mA

160 mA

Icc vs. Output Power vs. Icq

WCDMA, Vcc = 28V, 2140 MHz, 25 ˚C

0

50

100

150

200

19

21

23

25

27

29

Average Output Power (dBm)

20 mA

40 mA

60 mA

80 mA

100 mA

120 mA

140 mA

160 mA

Efficiency vs. Output Power vs. Icq

WCDMA, Vcc = 28V, 2140 MHz, 25 ˚C

0

5

10

15

20

25

30

19

21

23

25

27

29

Average Output Power (dBm)

20 mA

40 mA

60 mA

80 mA

100 mA

120 mA

140 mA

160 mA

Gain vs. Output Power vs. Icq

CW tone, Vcc = 28V, 2140 MHz, 25 ˚C

11

12

13

14

15

16

20

24

28

32

36

Output Power (dBm)

20 mA

40 mA

60 mA

80 mA

100 mA

120 mA

140 mA

160 mA

Output Power vs. Input Power vs. Icq

CW tone, Vcc = 28V, 2140 MHz, 25 ˚C

20

24

28

32

36

8

12162024

Input Power (dBm)

20 mA

40 mA

60 mA

80 mA

100 mA

120 mA

140 mA

160 mA

Efficiency vs. Output Power vs. Icq

CW tone, Vcc = 28V, 2140 MHz, 25 ˚C

0

10

20

30

40

50

20

24

28

32

36

Output Power (dBm)

20 mA

40 mA

60 mA

80 mA

100 mA

120 mA

140 mA

160 mA

OIP3 vs. Output Power vs. Icq

CW 2-tone signal, 2140 MHz, ∆f = 1 MHz, Vcc = 28V, 25 ˚C

30

35

40

45

50

55

24

26

28

30

32

34

Output Power, PEP (dBm)

20 mA

40 mA

60 mA

80 mA

100 mA

120 mA

140 mA

160 mA

IMD3 vs. Output Power vs. Icq

CW 2-tone signal, 2140 MHz, ∆f = 1 MHz, Vcc = 28V, 25 ˚C

-80

-70

-60

-50

-40

-30

24

26

28

30

32

34

Output Power, PEP (dBm)

20 mA

40 mA

60 mA

80 mA

100 mA

120 mA

140 mA

160 mA

IMD5 vs. Output Power vs. Icq

CW 2-tone signal, 2140 MHz, ∆f = 1 MHz, Vcc = 28V, 25 ˚C

-80

-70

-60

-50

-40

-30

24

26

28

30

32

34

Output Power, PEP (dBm)

20 mA

40 mA

60 mA

80 mA

100 mA

120 mA

140 mA

160 mA

1000 pF