AP601 datasheet(8/10 Pages) WJCI

8 / 10 page

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

circuit configurations shown previously in this datasheet have the device operating with a 40 mA as the quiescent current (ICQ).

This biasing level represents the best tradeoff in terms of linearity and efficiency. Lowering ICQ will improve upon the

efficiency of the device, but degraded linearity. Increasing ICQ has nominal improvement upon the linearity, but will degrade

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)

(Ω)

VPD

(V)

PIN_VPD

(V)

12k

2.50

5.44k

2.58

3.48k

2.63

2.61k

2.68

2.06k

2.72

1.67k

2.77

1.42k

2.81

1.22k

2.85

Thermal Rise vs. Output Power vs. Icq

Vcc = 28V

Output Power (dBm)

10 mA

20 mA

30 mA

40 mA

50 mA

60 mA

70 mA

80 mA

C19

1.8pF

2.4pF

C22

1.2pF

1000pF

3,3pF

ACLR1 vs. Output Power vs. Icq

WCDMA, Vcc = 28V, 2140 MHz, 25 ˚C

-60

-50

-40

-30

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

100

120

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

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

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

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

Output Power (dBm)

10 mA

20 mA

30 mA

40 mA

50 mA

60 mA

70 mA

80 mA

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