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 4 April 2006

ECG040

InGaP HBT Gain Block

Product Information

The Communications Edge

TM

Recommended 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

R4

16

Ω 1% tolerance

0805

Recommended Bias Resistor Values

Supply

Voltage

R1 value

Size

6 V

17.1 ohms

0805

7 V

31.4 ohms

1210

8 V

46 ohms

1210

9 V

60 ohms

2010

10 V

74 ohms

2010

12 V

103 ohms

2512

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.

Typical Device S-Parameters

Freq (MHz)

S11 (dB)

S11 (ang)

S21 (dB)

S21 (ang)

S12 (dB)

S12 (ang)

S22 (dB)

S22 (ang)

50

-23.31

-179.51

16.19

177.81

-19.40

-0.03

-36.95

-170.80

500

-23.69

170.90

16.04

158.74

-19.30

-5.83

-27.31

-130.75

1000

-23.45

162.60

15.79

138.37

-19.12

-12.26

-21.40

-141.51

1500

-22.70

156.61

15.50

118.53

-19.03

-19.16

-18.24

-153.77

2000

-22.13

148.64

15.16

99.02

-18.71

-26.80

-16.09

-175.02

2500

-19.60

139.22

14.76

79.46

-18.36

-32.98

-14.17

167.68

3000

-19.24

121.52

14.31

61.06

-18.13

-41.04

-12.61

152.88

3500

-16.99

115.00

13.86

41.97

-17.78

-51.05

-11.16

130.54

4000

-15.40

97.66

13.33

23.55

-17.23

-58.84

-10.31

115.55

4500

-13.81

84.99

12.88

4.82

-16.82

-68.93

-9.04

97.41

5000

-11.78

64.76

12.19

-13.55

-16.84

-79.74

-7.54

76.41

5500

-11.08

52.37

11.70

-30.90

-16.58

-89.82

-7.37

64.41

6000

-9.31

35.87

10.98

-50.95

-16.15

-102.41

-6.42

46.46

Device S-parameters are available for download off of the website at: http://www.wj.com

C1

Blocking

Capacitor

RF OUT

L1

RF Choke

C3

0.018 µF

R4

Bias

Resistor

RF IN

C4

Bypass

Capacitor

C2

Blocking

Capacitor

Vcc

Icc = 70 mA

ECG040