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 7

January 2006

VG025

High Linearity Variable Gain Amplifier

Product Information

The Communications Edge

TM

240 MHz Circuit Performance (VG025-PCB240)

S21 vs. Frequency

Vctrl=0V (Minimum attenuation)

10

12

14

16

18

20

200

220

240

260

280

300

Frequency (MHz)

-40 °C

+25 °C

+85 °C

S22 vs. Frequency

Vctrl=0V (Minimum attenuation)

-25

-20

-15

-10

-5

0

200

220

240

260

280

300

Frequency (MHz)

-40 °C

+25 °C

+85 °C

S11 vs. Frequency

Vctrl=0V (Minimum attenuation)

-25

-20

-15

-10

-5

0

200

220

240

260

280

300

Frequency (MHz)

-40 °C

+25 °C

+85 °C

S21 vs. Frequency vs. Control Voltage

-15

-10

-5

0

5

10

15

20

200

220

240

260

280

300

Frequency (MHz)

Vctrl=0.000V

Vctrl=0.784V

Vctrl=1.133V

Vctrl=1.844V

Vctrl=4.230V

S11 vs. Frequency vs. Control Voltage

-30

-25

-20

-15

-10

-5

0

200

220

240

260

280

300

Frequency (MHz)

Vctrl=0.000V

Vctrl=0.784V

Vctrl=1.133V

Vctrl=1.844V

Vctrl=4.230V

S22 vs. Frequency vs. Control Voltage

-30

-25

-20

-15

-10

-5

0

200

220

240

260

280

300

Frequency (MHz)

Vctrl=0.000V

Vctrl=0.784V

Vctrl=1.133V

Vctrl=1.844V

Vctrl=4.230V

P1dB vs. Frequency

Vctrl=0V (Minimum attenuation)

16

18

20

22

24

26

230

235

240

245

250

Frequency (MHz)

-40 °C

+25 °C

+85 °C

Phase change vs. Attenuation

25 °C, 240 MHz

0

10

20

30

40

50

0

4

8

12

162024

Attenuation (dB)

Noise Figure vs. Frequency

Vctrl=0V (Minimum attenuation)

1

2

3

4

5

6

220

230

240

250

260

Frequency (MHz)

-40 °C

+25 °C

+85 °C

OIP3 vs. Attenuation Setting

frequency = 240, 241 MHz, +5 dBm/tone, +25 °C

25

30

35

40

45

024

68

10

Attenuation (dB)

OIP3 vs. Output Power

frequency = 240, 241 MHz, 0dB Atten.

25

30

35

40

45

-4

0

4

8

12

16

Output Power (dBm)

+25 °C

-40 °C

+85 °C

IMD products vs. Output Power

fundamental frequency = 240, 241 MHz; +25 °C, 0dB Atten

-120

-100

-80

-60

-40

-4

0

4

8

12

16

Output Power (dBm)

IMD_Low

IMD_High

Gain vs. Pin 8 Attn. Control Current

25 °C, 240 MHz

-10

-5

0

5

10

15

0

5

10

15

20

25

Pin 8 Attenuation Control Current (mA)

Normalized Gain vs. Vctrl

25 °C, 240 MHz

-24

-20

-16

-12

-8

-4

0

0

12345

Vctrl (V)

Ictrl vs. Vctrl

25 °C

0

5

10

15

20

25

30

0

1234

5

Vctrl (V)