This document contains information on a new product.
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
August
2003
The Communications Edge
TM
VG024
Wide-band Variable Gain Amplifier
Product Information
Product Features
50 2200 MHz bandwidth
17 dB Attenuation Range
+37 dBm Output IP3
+21 dBm P1dB
Constant IP3 & P1dB over
attenuation range
Single voltage supply for DC
and RF circuit
SOIC-8 package w/ heat slug
MTTF > 100 years
Product Description
The VG024 is a wideband high dynamic range variable gain
amplifier (VGA) packaged in a SOIC-8 surface-mount
package. The +21 dBm output compression point and +37
dBm output intercept point of the amplifier are maintained
over the entire attenuation range, making the VG024 ideal
for use in temperature compensation circuits. With the
suggested driver circuit there can be independent gain slope
and offset control for compensating RF chains with many
amplifier stages. Other attenuator driver circuits give more
functionality to this MCM and can be found in the
application notes.
Superior thermal design allows the product to have a
minimum MTTF rating of 100 years at a mounting
temperature of +85 C. All devices are 100% RF & DC
tested and packaged on tape and reel for automated surface-
mount assembly.
Functional Diagram
Top View
Function Pin
No
Gain Control
1
RF Input
6
Interstage Match
2, 7, 8
RF Output / DC bias
4
Ground 3,
5
Specifications
Parameters
Units
Min
Typ
Max
Conditions
Frequency Range
MHz
50
2200
See note 1
Gain at min. attenuation
dB
14
15
Input Return Loss
dB
-10
Output Return Loss
dB
-10
Output
P1dB
dBm +21
Output
IP3
dBm +37
See
note
2
Noise Figure at min. attenuation
dB
5.0
5.5
7.2
V
A,CTRL
= 0 V See note 3
Gain Variation Range
dB
17
See note 4
Supply
Voltage
V +5
Operating RF Amplifier Current Range
mA
120
150
180
Pin 4
Gain Control Pin Current Range
mA
0
25
Pin 1 draws no current at maximum gain
Thermal Resistance
C / W
59
Junction Temperature
C 160
See
note
5
Test conditions unless otherwise noted.
1. T = 25C, Vdd = +5 V, Frequency = 800 MHz in an application circuit.
2. 3OIP measured with two tones at an output power of +10 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. Frequency 240-1000 MHz max 6dB at 70 MHz and 7dB at 2.2 GHz T = 25C
4. Frequency 70-1000 MHz min gain control pin current 15mA 11 dB at 2.2 GHz depending on maximum gain control pin current
5. The max junction temperature ensures a minimum MTBF rating of 1 million hours of usage.
Absolute Maximum Rating
Ordering Information
Parameters
Rating
Part No.
Description
Operating Case Temperature
-40 to +85
C
VG024
Wide-band Variable Gain Amplifier
Storage Temperature
-55 to +125
C
VG024-PCB-240
Fully Assembled IF Application Board
Amplifier Supply Voltage (pin 4)
+6 V
VG024-PCB-2000
Fully Assembled PCS / UMTS
Gain Pin Control Current (pin 1)
+30 mA
Application
Board
RF Input Power (continuous)
+12 dBm
Maximum Junction Temperature
+220
C
Operation of this device above any of these parameters may cause permanent damage.
1
2
3
4
8
7
6
5
VG024
This document contains information on a new product.
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
August
2003
The Communications Edge
TM
VG024
Wide-band Variable Gain Amplifier
Product Information
Temperature Compensation Application Circuit: 240 MHz
Bill of Materials
Ref. Des.
Description
C1, C3, C5
1000 pF Chip Capacitor
C2, C4, C8
0.01
F Chip Capacitor
C6
2.2
F 1206 Chip Capacitor
C7
0.47
F 1206 Chip Capacitor
C9
Do Not Load
L1, L2
220 nH 0805 Chip Inductor
L3
47 nH 0805 Chip Inductor
R1
2.21 K
Chip Resistor
R2
3.32 K
Chip Resistor
R3, R4, R5
10.0 K
Chip Resistor
R6
100
Chip Resistor
Roffset
0603 chip Resistor
Rslope
0603 chip Resistor
Q1
MMBT2222A Motorola
Transistor
U1
VG024 Variable Gain Amplifier
U2
LM2904 Dual Op Amp
Evaluation Board Layout
Functional Pin Layout
Pin FUNCTION
1 Gain
control
pin
2 Interstage
Match
3 GND
4
RF Output / Bias
5 GND
6 RF
Input
7 Interstage
Match
8 Interstage
Match
The amplifier is biased through Pin 4 and should be connected directly into
a voltage regulator.
Circuit Board Material:
.014" FR-4, 4 layers
.062" total thickness
This document contains information on a new product.
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
August
2003
The Communications Edge
TM
VG024
Wide-band Variable Gain Amplifier
Product Information
Typical Performance Charts: 240 MHz Application Circuit
S-Parameters
3
6
9
12
15
18
200
225
250
275
300
Frequency (MHz)
S21 (
d
B)
-20
-15
-10
-5
0
5
Attenutation Control Voltage =0 V, 25C
R
e
tu
r
n
L
o
s
s
(d
B
)
S21, S11, S22 vs Gain Control Voltage
-30
-20
-10
0
10
20
0
1
2
3
4
5
Vcontrol
Magnitude (dB)
0
3
6
9
12
15
Frequency = 240 MHz
Pin Current
Vcontrol voltage can be applied to the base of an NPN transistor with the collector connected to the +5V and a 240 ohm
current limiting resistor to drive the VG024 as a VGA. This data is represented at 240 MHz in the above graph. Normalized
performance can be obtained for the RF circuit tuned from 70-1000 MHz using the temperature compensation application
circuit for 240 MHz shown on the previous page. Reducing Roffset increases the overall insertion loss and allows more
change (reduction in the value) in Rslope to compensate for more amplifiers or larger temperature changes.
VG024 Temperature Compensation Amplifier
3
5
7
9
11
13
15
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
Temperature (DEG C)
Gain (dB)
Rslope =
5.0K
1.3K
1.0K
800
550
In
1.8K
510
Inf
28
210
Roffset = 5.6K
2.7
1.35K
This document contains information on a new product.
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
August
2003
The Communications Edge
TM
VG024
Wide-band Variable Gain Amplifier
Product Information
Application Circuit: 2.2 GHz
Bill of Materials
Ref. Des.
Description
C1, C5
22 pF Chip Capacitor
C2, C10
1.8 pF Chip Capacitor
C3
1000 pF Chip Capacitor
C4, C8
0.01
F Chip Capacitor
C6
2.2
F 1206 Chip Capacitor
C7
0.47
F 1206 Chip Capacitor
L1 10
nH
Chip
Inductor
L2 18
nH
Chip
Inductor
R1
2.21 K
Chip Resistor
R2
3.32 K
Chip Resistor
R3, R4, R5
10.0 K
Chip Resistor
R6
100
Chip Resistor
Roffset
0603 chip Resistor
Rslope
0603 chip Resistor
Q1
MMBT2222A Motorola
Transistor
U1
VG024 Variable Gain Amplifier
U2
LM2904 Dual Op Amp
S-Parameters
3
6
9
12
15
18
600
700
800
900
1000
1100
Frequency (MHz)
S21 (dB)
-20
-15
-10
-5
0
5
Attenuation Control Voltage =0 V, 25C
Return Loss (dB)
S-Parameters
0
2
4
6
8
10
12
1500
1700
1900
2100
2300
2500
Frequency (MHz)
S21 (dB)
-20
-15
-10
-5
0
5
Attenuation Control Voltage = 0 V, 25C
Return Loss (dB)
S21, S11, S22 vs Gain Control Voltage
-30
-20
-10
0
10
20
0
1
2
3
4
5
Vcontrol
Magnitude (dB)
0
3
6
9
12
15
Frequency = 800 MHz
Pin Current
OIP3 / P1dB vs. Normalized Gain
frequency = 900 MHz, Pout = +10 dBm, 25C
15
20
25
30
35
40
-20
-15
-10
-5
0
Normalized Gain (dB)
Magnitude (dBm)
P1dB
OIP
Normalized to the maximum gain level of 17
This document contains information on a new product.
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
August
2003
The Communications Edge
TM
VG024
Wide-band Variable Gain Amplifier
Product Information
Mounting Configuration
Land Pattern
ESD Classification: Class 1B
Value:
Passes 600 V
Test:
Human Body Model (HBM)
Standard:
JEDEC Standard JESD22-A114
ESD Classification: Class IV
Value:
Passes 1000 V
Test:
Charged Device Model (CDM)
Standard:
JEDEC Standard JESD22-C101
MSL Rating:
Level 3
Standard:
JEDEC Standard J-STD-020A
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