VG112
PCS/UMTS-band Variable Gain Amplifier
Product Features
1800 – 2200 MHz bandwidth
25 dB Gain at 1.9 GHz
28 dB Attenuation Range
+46 dBm Output IP3
+30 dBm P1dB
Constant IP3 & P1dB over
attenuation range
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+5V Single voltage supply
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Pb-free / green / RoHS-compliant
6x6 mm QFN package
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MTTF > 100 years
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Product Description
The VG112 is a PCS / UMTS-band high dynamic range
variable gain amplifier (VGA) housed in a low profile
Pb-free / green / RoHS-compliant surface-mount leadless
QFN package that measures 6 x 6 mm square.
The +30 dBm output compression point and +46 dBm
output intercept point of the amplifier are maintained over
the entire attenuation range, making the VG112 ideal for
use in transmitter and receiver AGC circuits. The high gain
of the dual-stage amplifier allows for more integration in a
transceiver board while requiring minimal printed circuit
board space.
Superior thermal design allows the product to have a
minimum MTTF rating of 100 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
Gain Ctrl
GND
7
GND 8
GND 9
GND 10
RF IN 11
GND 12
GND 13
GND 14
15
GND
16
GND
17
GND
18
GND
19
Vbias2
20
GND
21
GND
6
5
4
3
GND
2
Vbias1
1
28 GND
27 Vcc1
26 GND
25 RF OUT /
Vcc2
24 GND
23
RF OUT /
Vcc2
22 GND
GND
GND
GND
Amp
Variable
Attenuator
Applications
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Xmit & Rcv AGC circuitry for
mobile infrastructure
Specifications
(1)
Parameter
Operational Bandwidth
Test Frequency
Gain at min. attenuation
Input Return Loss
Output Return Loss
Output P1dB
Output IP3
Noise Figure at min. attenuation
Gain Variation Range
Gain Variation Control Voltage, V
CTRL
Supply Voltage, V
CC
Operating Amplifier Current Range
Gain Control Pin Current
Units
MHz
MHz
dB
dB
dB
dBm
dBm
dB
dB
V
V
mA
mA
Min
1800
20.5
Typ
2140
23
18
8.2
+30
+46
8
28
Max
2200
Conditions
See note 1
+43
23.5
0
350
4.5
+5
415
475
20
See note 2
V
CTRL
= 0 V
See note 3
See note 1
Pin 25
V
CTRL
= 4.5 V. See note 1.
1. Test conditions unless otherwise noted: 25 ºC, Vcc = +5 V in a tuned application circuit. Vctrl is the control voltage through a 220
Ω
dropping resistor as shown in the same application circuit.
2. 3OIP measured with two tones at an output power of +15 dBm/tone separated by 1 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 2.14 GHz.
Absolute Maximum Rating
Parameter
Operating Case Temperature
Storage Temperature
Pin 5 (Gain Control) Current
Junction Temperature
Rating
-40 to +85
°C
-55 to +125
°C
30 mA
+250
°C
Ordering Information
Part No.
VG112-G
VG112-PCB
Description
PCS/UMTS-band Variable Gain Amplifier
(lead-free/green/RoHS-compliant QFN package)
2140 MHz Fully Assembled Application Board
Specifications and information are subject to change without notice
Operation of this device above any of these parameters may cause permanent damage.
WJ Communications, Inc
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Phone 1-800-WJ1-4401
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FAX: 408-577-6621
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e-mail: sales@wj.com
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Web site: www.wj.com
Page 1 of 5
December 2006
WJCI [ WJ COMMUNICATION. INC. ]
