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VG024
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
The Communications Edge TM
Wide-band Variable Gain Amplifier
Product Information
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 surfacemount assembly.
Functional Diagram
1 8 7 6 VG024 5
2 3
4
Top View
Function Gain Control RF Input Interstage Match RF Output / DC bias Ground Pin No 1 6 2, 7, 8 4 3, 5
Specifications
Parameters
Frequency Range Gain at min. attenuation Input Return Loss Output Return Loss Output P1dB Output IP3 Noise Figure at min. attenuation Gain Variation Range Supply Voltage Operating RF Amplifier Current Range Gain Control Pin Current Range Thermal Resistance Junction Temperature
Units
MHz dB dB dB dBm dBm dB dB V mA mA C / W C
Min
50 14
Typ
15 -10 -10 +21 +37 5.5 17 +5 150
Max
2200 See note 1
Conditions
5.0
7.2
See note 2 VA,CTRL = 0 V See note 3 See note 4 Pin 4 Pin 1 draws no current at maximum gain See note 5
120 0
180 25 59 160
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
Parameters
Operating Case Temperature Storage Temperature Amplifier Supply Voltage (pin 4) Gain Pin Control Current (pin 1) RF Input Power (continuous) Maximum Junction Temperature
Ordering Information
Part No.
VG024 VG024-PCB-240 VG024-PCB-2000
Rating
-40 to +85 C -55 to +125 C +6 V +30 mA +12 dBm +220 C
Description
Wide-band Variable Gain Amplifier Fully Assembled IF Application Board Fully Assembled PCS / UMTS Application Board
Operation of this device above any of these parameters may cause permanent damage. 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
VG024
The Communications Edge TM
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 MMBT2222A Motorola Q1 Transistor U1 VG024 Variable Gain Amplifier U2 LM2904 Dual Op Amp
Evaluation Board Layout
Functional Pin Layout
Pin 1 2 3 4 5 6 7 8
*
FUNCTION Gain control pin Interstage Match GND RF Output / Bias GND RF Input Interstage Match 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
VG024
The Communications Edge TM
Wide-band Variable Gain Amplifier
Product Information
Typical Performance Charts: 240 MHz Application Circuit
S-Parameters
Attenutation Control Voltage =0 V, 25C
S21, S11, S22 vs Gain Control Voltage
18 15
S21 (dB)
5
Magnitude (dB)
20 10 0 -10 -20 -30 0 1
Frequency = 240 MHz
15 12 9 6 3 0
Pin Current
August 2003
0 -5
Return Loss (dB)
12 9 6 3 200
-10 -15 -20 300
225
Frequency (MHz)
250
275
2
Vcontrol
3
4
5
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 15 Roff set = 5.6K
13
Rslope = 5.0K 1.3K 1.0K In 1.8K 800 550
11 Gain (dB)
2.7
9
1.35K Inf 7 510 28 5 210
3 -40 -30 -20 -10 0 10 20 30 Temperature (DEG C) 40 50 60 70 80
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
VG024
The Communications Edge TM
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 MMBT2222A Motorola Q1 Transistor U1 VG024 Variable Gain Amplifier U2 LM2904 Dual Op Amp
S-Parameters
S21, S11, S22 vs Gain Control Voltage
18 15
S21 (dB)
Attenuation Control Voltage =0 V, 25C
5
Return Loss (dB)
20
Magnitude (dB)
Frequency = 800 MHz
15 12 9 6 3 0
Pin Current
0 -5
10 0 -10 -20 -30 0 1 2
Vcontrol
12 9 6 3 600
-10 -15 -20 1100
700
800
900
1000
Frequency (MHz)
3
4
5
S-Parameters
12 10
S21 (dB)
Attenuation Control Voltage = 0 V, 25C
5
Return Loss (dB)
OIP3 / P1dB vs. Norm alized Gain frequency = 900 MHz, Pout = +10 dBm, 25C 40 Magnitude (dBm) 35 30 25 20 15 0 Normalized to the maximum gain level of 17 -5 -10 -15 -20 P1dB OIP
0 -5 -10 -15 -20 2500
8 6 4 2 0 1500 1700 1900 2100 2300
Frequency (MHz)
Norm alized Gain (dB)
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
VG024
The Communications Edge TM
Wide-band Variable Gain Amplifier
Product Information
Mounting Configuration
Land Pattern
ESD Classification: Value: Test: Standard: ESD Classification: Value: Test: Standard: MSL Rating: Standard:
Class 1B Passes 600 V Human Body Model (HBM) JEDEC Standard JESD22-A114 Class IV Passes 1000 V Charged Device Model (CDM) JEDEC Standard JESD22-C101 Level 3 JEDEC Standard J-STD-020A
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
VG024
The Communications Edge TM
Wide-band Variable Gain Amplifier
Product Information
Outline Drawing
Product Marking
The component will be lasermarked with a "VG024" designator with a four-digit alphanumeric lot code on the top surface of the package. Tape and reel specifications for this part will be located on the website in the "Application Notes" section.
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

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