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 1 of 5

June 2005

VG101

Cellular-band Variable Gain Amplifier

Product Information

The Communications Edge

TM

Product Features

attenuation range

Applications

mobile infrastructure

Product Description

The VG101 is a cellular-band high dynamic range

variable gain amplifier (VGA) packaged in a low

profile

Pb-free

/

RoHS-compliant

surface-mount

leadless package that measures 6 x 6 mm square.

The +22 dBm output compression point and +40

dBm output intercept point of the amplifier are

maintained over the entire attenuation range, making

the VG101 ideal for use in transmitter and receiver

AGC circuits and as a variable gain stage following

an LNA in high dynamic range receiver front ends.

Superior thermal design allows the product to have a

minimum MTTF rating of 1000 years at a mounting

temperature of +85 ºC. All devices are 100% RF &

DC tested and packaged on tape and reel for

automated surface-mount assembly.

Functional Diagram

Function

Pin No

Gain Control

5

No Connect

7, 19

RF Input

11

Interstage Match

21

RF Output / DC bias

25

Ground

All other pins

Backside copper

Specifications

(1)

Parameter

Units

Min

Typ

Max

Conditions

Operational Bandwidth

MHz

750

1000

Test Frequency

MHz

900

See note 1

Gain at min. attenuation

dB

15

16

Input Return Loss

dB

12

Output Return Loss

dB

10

Output P1dB

dBm

+22

Output IP3

dBm

+37

+40

See note 2

Noise Figure at min. attenuation

dB

3

Gain Variation Range

dB

25.5

28.7

33.5

See note 3

V

0

4.5

See note 1

Group Delay

ns

1

Frequency = 900 MHz

Supply Voltage

V

+5

Operating Amplifier Current Range

mA

120

150

180

Pin 25

Gain Control Pin Current

mA

20

1. Test conditions unless otherwise noted: 25ºC, Vdd = +5 V in a tuned application circuit. Vctrl is the control voltage through a BJT transistor and a 100

Ω dropping resistor as shown in the same application circuit.

2. 3OIP measured with two tones at an output power of +5 dBm/tone separated by 10 MHz. The suppression on the largest IM3 product is used to calculate the 3OIP using a 2:1 rule.

3. The gain variation range is measured as the difference in gain with Vctrl = 0V and Vctrl = 4.5V at 0.9 GHz.

Absolute Maximum Rating

Parameter

Rating

Operating Case Temperature

-40 to +85

°C

Storage Temperature

-55 to +125

°C

Amplifier Supply Voltage (pin 25)

+6 V

Pin 5 (Gain Control) Current

30 mA

RF Input Power (continuous)

+12 dBm

Junction Temperature

+220

°C

Operation of this device above any of these parameters may cause permanent damage.

Ordering Information

Part No.

Description

VG101*

Cellular-band Variable Gain Amplifier

(tin-lead 6mm QFN package)

VG101-F

Cellular-band Variable Gain Amplifier

(lead-free/RoHS-compliant QFN package)

VG101-PCB

Fully Assembled Application Board

*

This package is being phased out in favor of the lead-free/RoHS-compliant package type which is

backwards compatible for existing designs. Refer to WJPCN06MAY05TC1 on the WJ website.

8

9

10

11

12

13

14

28

27

26

25

24

23

22

7

6

5

4

3

2

1

15

16

17

18

19

20

21

GND

GND

GND

RF OUT

GND

GND

GND

GND

GND

GND

RF IN

GND

GND

GND

Variable

Attenuator

Amp