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

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February 2006

VG111

PCS/UMTS-band Variable Gain Amplifier

Product Information

The Communications Edge

TM

Application Circuit: 2.0 – 2.2 GHz (VG111-PCB2100)

• Pins 7, 19, and 21 should not be connected.

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

• DNP represents Do Not Place.

• 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

0.2 pF Chip Capacitor

0603

C3, C4

0.01

μF Chip Capacitor

0603

C5

0.6 pF Chip Capacitor

0603

C6

Do Not Place

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 = 2140, 2141 MHz, 0dB Atten.

25

30

35

40

45

-4

0

4

8

12

16

Output Power (dBm)

+25C

-40C

+85C

OIP3 vs. Attenuation

frequency = 2140, 2141 MHz, +10 dBm/tone, +25° C

25

30

35

40

45

02

46

8

10

Attenuation (dB)

ACPR vs. Channel Power

2140 MHz, 3GPP W-CDMA, Test Model 1 + 64 DPCH, ±5 MHz offset, 25°C

-60

-55

-50

-45

-40

11

12

13

14

15

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