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 3 of 6 July 2005

AG503-86

InGaP HBT Gain Block

Product Information

The Communications Edge

TM

Typical Device RF Performance

Supply Bias = +8 V, Rbias = 44

Ω, Icc = 45 mA

Gain vs. Frequency

12

14

16

18

20

22

01

2

3

4

Frequency (GHz)

-40 C

+25 C

+85 C

Output IP3 vs. Frequency

15

20

25

30

35

00.5

11.522.5

33.5

Frequency(GHz)

-40 C

+25C

+85C

Output IP2 vs. Frequency

25

30

35

40

45

0

200

400

600

800

1000

Frequency(MHz)

-40 C

+25 C

+85 C

P1dBvs. Frequency

0

5

10

15

20

00.511.522.5

3

3.5

4

Frequency (GHz)

-40 C

+25C

+85C

Noise Figure vs. Frequency

0

1

2

3

4

5

0

0.5

1

1.5

2

2.5

3

Frequency (GHz)

-40 C

+25C

+85C

Application Circuit

Recommended Component Values

Reference

Frequency (MHz)

Designator

50

500

900

1900

2200

2500

3500

L1

820 nH

220 nH

68 nH

27 nH

22 nH

18 nH

15 nH

C1, C2, C4

.018 µF

1000 pF

100 pF

68 pF

68 pF

56 pF

39 pF

1. The proper values for the components are dependent upon the intended frequency of operation.

2. The following values are contained on the evaluation board to achieve optimal broadband performance:

Ref. Desig.

Value / Type

Size

L1

39 nH wirewound inductor

0603

C1, C2

56 pF chip capacitor

0603

C3

0.018

μF chip capacitor

0603

C4

Do Not Place

R1

22.1

Ω 1% tolerance

0805

Recommended Bias Resistor Values

Supply

Voltage

R1 value

S ize

6 V

22.2 ohms

0603

7 V

44.4 ohms

0805

8 V

67 ohms

1206

9 V

89 ohms

1210

10 V

111 ohms

1210

12 V

156 ohms

2010

The proper value for R1 is dependent upon the supply

voltage and allows for bias stability over temperature.

WJ recommends a minimum supply bias of +6 V. A

1% tolerance resistor is recommended.

C1

Blocking

Capacitor

RF OUT

L1

RF Choke

C3

0.018 µF

R1

Bias

Resistor

RF IN

C4

Bypass

Capacitor

C2

Blocking

Capacitor

Vcc

Icc = 45 mA

AG503-86