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 4 of 11 May 2007 ver 1

AP602

High Dynamic Range 4W 28V HBT Amplifier

869-960 Application Circuit (AP602-PCB900)

Typical WCDMA Performance at 25

°C

at a channel power of +27 dBm

Frequency

940 MHz

W-CDMA Channel Power

+27 dBm

Power Gain

15.5 dB

Input Return Loss

11 dB

Output Return Loss

6.4 dB

ACLR

-50 dBc

IMD3 @ +27 dBm PEP

-50 dBc

Operating Current, Icc

103 mA

Collector Efficiency

17 %

Output P1dB

+35.7 dBm

Quiescent Current, Icq

80 mA

Vpd, Vbias

+5 V

Vcc

+28 V

Notes:

1. The primary RF microstrip line is 50

Ω.

2. Components shown on the silkscreen but not on the schematic are not used.

3. C20 is not required in the final design if there is no DC signal present at the output of the

amplifier circuit.

4. The center of C24 is placed at 0.280” (11.5

° @ 940 MHz) from the edge of the AP602 (U1).

5. The center of L10 is placed at 0.570” (23.4

° @ 940 MHz) from the edge of the AP602 (U1).

6. The center of C19 is placed at 0.050” (2.1

° @ 940 MHz) the center of L10.

7. The bold-faced RF trace is for the DC bias feed. The stub’s length is approximately a ¼ λ.

8. The main RF trace is cut at component L3 and L4 for this particular reference design.

869-960 MHz Application Circuit Performance Plots

Gain vs. Frequency

Vcc = 28V, Icq = 80 mA, 25 ˚C

13

14

15

16

17

18

0.8

0.84

0.88

0.92

0.96

1

Frequency (GHz)

S11, S22 vs. Frequency

Vcc = 28V, Icq = 80 mA, 25 ˚C

-25

-20

-15

-10

-5

0

0.8

0.85

0.9

0.95

1

1.05

1.1

Frequency (GHz)

S11

S22

Efficiency vs. Output Power vs. Frequency

CW tone, Vcc = 28V, Icq = 80 mA, 25 ˚C

0

10

20

30

40

50

18

22

26

30

34

Output Power (dBm)

920 MHz

940 MHz

960 MHz

ACLR1 vs. Output Power vs. Frequency

WCDMA, Vcc= 28V, Icq = 40mA, 25

-62

-58

-54

-50

-46

-42

18

20

22

24

26

28

Output Power (dBm)

869MHz

880MHz

894MHz

920MHz

940MHz

960MHz

WCDMA 3GPP TM 1+64 DPCH;

PAR = 8.6 @0.01%

60% clipping, Ch. BW = 3.84 MHz;

IMD vs. Output Power

CW 2-tone signal, 940 MHz, ∆f = 1 MHz, 28V, 80 mA Icq, 25 ˚C

-80

-70

-60

-50

-40

22

24

26

28

30

32

Output Power, PEP (dBm)

IMD3L

IMD3U

IMD5

Efficiency vs. Output Power vs. Frequency

WCDMA, Vcc = 28V, Icq = 80 mA, 25 ˚C

0

5

10

15

20

25

18

20

22

24

26

28

Average Output Power (dBm)

920 MHz

940 MHz

960 MHz

Unconditionally stable version of this application circuit is available for download off of the website at: http://www.wj.com

See note 4

2 Ohm

C7

1000pF

C24 L3

C30

L10

W = .030”

L = 1.570”

C15

100pF

C30

100pF

L10

8.2 nH

See note 5

C19

0.4 pF

See note 6