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 6

January 2007

VG111

PCS/UMTS-band Variable Gain Amplifier

Application Circuit: 1.8 – 2.0 GHz (VG111-PCB1900)

• The amplifier is biased through Pin 25 and should be connected directly into a voltage regulator.

• Components shown in the silkscreen but not on the schematic are not used for this circuit.

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

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

Bill of Materials

Ref. Des.

Description

Size

C1, C7

47 pF Chip Capacitor

0603

C2, C5

Do Not Place

C3, C4

0.01

μF Chip Capacitor

0603

C6

0.4 pF Chip Capacitor

0603

L1, L2

22 nH Chip Inductor

0603

R1

100

Ω Chip Resistor

0603

R2

2.2

Ω Chip Resistor

0603

Q1

MMBT2222 Motorola Transistor

SOT-23

U1

VG111 Variable Gain Amplifier

QFN 6x6

OIP3 vs. Output Power

frequency = 1900, 1901 MHz, 0dB Atten.

25

30

35

40

45

-4

0

4

8

12

16

Output Power (dBm)

+25C

-40C

+85C

OIP3 vs. Attenuation Setting

frequency = 1900, 1901 MHz, +10 dBm/tone, +25° C

25

30

35

40

45

0

246

8

10

Attenuation (dB)

ACPR vs. Channel Power

1960 MHz, IS-95, 9 Ch. Forward, ±885 kHz offset, 30 kHz Meas BW, 25°C

-70

-60

-50

-40

10

11

12

13

14

15

16

Output Channel Power (dBm)

0dB Attn

2.5dB Attn

5dB Attn

10dB Attn

Gain vs. Pin 5 Attn. Control Current

-20

-15

-10

-5

0

5

10

15

20

0

5

10

15

20

25

Pin 5 Attenuation Control Current (mA)

+25°C

-40°C

+85°C

Normalized Gain vs. Pin 5 Control Current

0

5

10

15

20

25

30

35

0.1

1.0

10.0

100.0

Pin 5 Attenuation Control Current (mA)

+25°C

-40°C

+85°C