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 10 May 2007 ver 1

AP601

High Dynamic Range 1.8W 28V HBT Amplifier

869-960 Application Circuit (AP601-PCB900)

Typical WCDMA Performance at 25

°C

at a channel power of +24 dBm

Frequency (MHz)

880

940

Units

W-CDMA Ch. Power

+24

+24

dBm

Power Gain

16.5

15.8

dB

Input Return Loss

8.9

14

dB

Output Return Loss

15

7.5

dB

ACLR

-50

-50

dBc

IMD3 @ +24 dBm PEP

-51

-51

dBc

Operating Current, Icc

54

52

mA

Collector Efficiency

16.6

17

%

Output P1dB

+32.5 +32.5 dBm

Quiescent Current, Icq

40

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. The center of C1 is at 0.710” (29.1

° @ 940 MHz) from the center of C24.

4. The center of C24 is placed at 0.285” (11.7

°@ 940 MHz) from the edge of the AP601 (U1).

5. The center of C26 is placed at 0.055” (2.3

° @ 940 MHz) from the edge of the AP601 (U1).

6. The center of L4 is at 0.095” (3.9

° @ 940 MHz) from the center of C26.

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 components L3 and L4 for this particular reference design.

869-960 MHz Application Circuit Performance Plots

Gain vs. Frequency

Vcc = 28V, Icq = 40 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 = 40 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 = 40 mA, 25 ˚C

0

10

20

30

40

50

60

17

21

25

29

33

Output Power (dBm)

920 MHz

940 MHz

960 MHz

ACLR1 vs. Output Power vs. Frequency

WCDMA, Vcc = 28V, Icq = 40 mA, 25 ˚C

-60

-55

-50

-45

-40

16

18

20

22

24

26

Average Output Power (dBm)

869 MHz

920 MHz

880 MHz

940 MHz

894 MHz

960 MHz

WCDMA 3GPP Test Model 1+64DPCH,

60% clipping, PAR = 8.6 dB @ 0.01%

IMD vs. Output Power

CW 2-tone signal, 940 MHz, ∆f = 1 MHz, 28V, 40 mA Icq, 25 ˚C

-70

-60

-50

-40

20

22

24

26

28

30

Output Power, PEP (dBm)

IMD3L

IMD3U

IMD5

ACPR vs. Output Power vs. Frequency

IS-95A, 9 Ch. Fwd, 940 MHz, Vcc = 28V, Icq = 40 mA, 25 ˚C

-70

-60

-50

-40

17

19

21

23

25

27

Average Output Power (dBm)

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

C24

1.8pF

See note 4

C26

0.5pF

See note 5

5.1 Ohm

3.3pF

See note 3

C7

1000pF

15nH

See note 6