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 2 of 5

June 2005

VG101

Cellular-band Variable Gain Amplifier

Product Information

The Communications Edge

TM

Application Circuit: 750 – 1000 MHz (VG101-PCB)

Circuit Board Material: .014” FR-4, 4 layers, .062” total thickness

• The amplifier is biased through Pin 25 and should be connected

directly into a voltage regulator.

• Distances are shown from the edge-to-edge for the land pattern.

Bill of Materials

Ref. Des.

Description

Size

C1, C3

47 pF Chip Capacitor

0603

C2, C4

0.01

μF Chip Capacitor

0603

C5

1 pF Chip Capacitor

0603

L1

82 nH Chip Inductor

0603

L2

39 nH Chip Inductor

0603

L3

2.7 nH Chip Inductor

0603

L4

8.2 nH Chip Inductor

0603

R1

100

Ω Chip Resistor

0603

R3

2.7

Ω Chip Resistor

0603

R4

4.7

Ω Chip Resistor

0603

R5

47

Ω Chip Resistor

0603

Q1

MMBT2222 Motorola Transistor

SOT-23

U1

VG101 Variable Gain Amplifier

QFN 6x6

OIP3 vs. Output Power

frequency = 900, 910 MHz, 0dB Atten.

25

30

35

40

45

-4

048

12

16

Output Power (dBm)

+25C

-40C

+85C

OIP3 vs. Attenuation Setting

frequency = 900, 910 MHz, 25C, 10 dBm/tone

25

30

35

40

45

02468

10

Attenuation (dB)

ACPR vs. Channel Power

880 MHz, IS-95, 9 Ch. Forward, ±885 kHz offset, 30 kHz Meas BW, 25°C

-70

-60

-50

-40

12

13

14

15

16

Output Channel Power (dBm)

0dB Attn

5dB Attn

10dB Attn