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VG025
Product Features
* Tunable within 50 - 2200 MHz * 21 dB Attenuation Range
The Communications Edge TM Product Information
High Linearity Variable Gain Amplifier
Product Description
The VG025 is a high dynamic range variable gain amplifier (VGA) capable of achieving an analog attenuation range of up to 21 dB. The +21 dBm output compression point and +40 dBm output intercept point of the amplifier are maintained over the entire attenuation range, making the VG025 ideal for use in temperature compensation circuits or AGC loops. The VG025 is available in a lead-free/green/RoHScompliant 16-pin 4x4mm QFN surface-mount package with an exposed backside paddle to allow an MTTF rating of over 1000 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
N/C N/C N/C 14 16 N/C 1 N/C 2 N/C 3 RF IN 4 5 N/C 6 Interstage Match 7 N/C 8 Gain Control 15 N/C 13 12 RF OUT 11 N/C 10 Interstage Match 9 N/C
* Constant +40 dBm OIP3 and +21 dBm P1dB over all gain settings * Single +5V Supply Voltage * 16-pin 4x4mm lead-free/green/ RoHS-compliant QFN Package * MTTF > 1000 years
Applications
* AGC circuitry * Temperature compensation circuits * DCS/PCS, cdma2000TM, W-CDMA
Function RF Input Gain Control Interstage Match RF Output / DC bias No Connect or GND Ground
Pin Number 4 8 6, 10 12 All other pins Backside slug
Specifications (1)
Parameter
Operational Bandwidth Test Frequency Gain (2) Input Return Loss (2) Output Return Loss (2) Output P1dB Output IP3 (3) Noise Figure (2) Gain Variation Range (4) Gain Variation Control Voltage (5) Supply Voltage Operating Current Range Gain Control Pin Current
Typical Performance (1)
Units Min
MHz MHz dB dB dB dBm dBm dB dB V V mA mA 50 13.5 800 15 6.3 7.6 21.3 39 5.3 21 5 150 26
Typ
Max
2200
Parameter
Frequency Gain (2) Input Return Loss (2) Output Return Loss (2) Output P1dB Output IP3 (3) Noise Figure (2) Gain Variation Range
Units
MHz dB dB dB dBm dBm dB dB 240 15.4 11 11 21.8 42 4.5 20
Typical
800 15 6.3 7.6 21.3 39 5.3 21 1960 8.4 12 6.5 22 40 8.1 14 2140 8.4 11 5.6 22 40 8.2 13
37 16 0 120
24 4.5 180 28
1. Test conditions unless otherwise noted: 25C, Vsupply = +5 V, in tuned application circuit. Vctrl is the control voltage through the 120 dropping resistor as shown in the application circuit on page 2. 2. Specifications refer to the device at the maximum gain setting (Vctrl=0V). The input and output return loss will be dramatically improved with an attenuation setting greater than 1 dB. 3. 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. 4. The gain variation range is measured as the difference in gain with Vctrl = 0 and 4.5V at 800 MHz. 5. This voltage refers to the VCTRL as shown in the circuit schematic on page 2. There should be a series resistance of 120 between the control voltage and pin 8 for proper operation.
Absolute Maximum Rating
Parameter
Operating Case Temperature Storage Temperature Amplifier Supply Voltage (pin 12) Pin 8 (Gain Control) Current RF Input Power (continuous) Junction Temperature -40 to +85 C -55 to +125 C +6 V 30 mA 4 dB above Input P1dB +220 C
Rating
Ordering Information
Part No.
VG025-G
Description
High Linearity Variable Gain Amplifier
(lead-free/green/RoHS-compliant 4x4mm QFN package)
VG025-PCB240 240 MHz Evaluation Board VG025-PCB800 800 MHz Evaluation Board VG025-PCB2000 1.7 - 2.2 GHz Evaluation Board
Operation of this device above any of these parameters may cause permanent damage. 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 7 January 2006
VG025
The Communications Edge TM Product Information
High Linearity Variable Gain Amplifier
Application Circuit Configurations
Circuit Board Material: .014" FR-4, 4 layers, .062" total thickness
The WJ VG025 variable gain amplifier can operate over a very broad range of frequencies (50 - 2200MHz), but needs specific matching circuits for specific bands of interest. At the maximum gain state, reasonable matching is only available for about 10% of the reference frequency. The amplifier operates with a typical current of 150 mA at +5 V while the attenuator current can be varied from 0 to 30 mA, while maintaining constant OIP3 and P1dB. The RF matching of the VG025 for the entire frequency range can be accomplished with the systematic adjustment of only a few parts. The RF matching is not influenced by different attenuator drive methods provided there is adequate decoupling of the attenuator bias. This reference application circuit uses voltage applied between 0 and 4.5V onto the Vctrl as shown on the schematic above. The R2 is a current limiting resistor to help linearize the drive of the attenuator and give better attenuator current control. To properly design the VG025 for an application, pick the frequency of interest. Choose blocking capacitor values which give RF impedance of less than 3 ohms. Choose the RF chokes for the largest inductance while still having resonant frequency about 30% Reference Frequency C1, C5 C2 C3, C4 C6 C9 L1, L2 L3 L4 R1 R2 Attenuation Range Maximum Gain Input Return Loss Output Return Loss Output P1dB Output IP3 Noise Figure MHz pF pF F pF pF nH nH nH dB dB dB dB dBm dBm dB 240 1000 0 .01 DNP 1.2 220 47 DNP DNP 120 20 15.4 11 11 21.8 42 4.5
greater than the Reference frequency (this allows for good isolation and inductor variation). Next choose L3 and C9 for interstage matching. C9 is only needed for lower frequencies and determines the low frequency roll off of the gain. L3 will have dominant control over the input and output return losses at maximum gain state (0 mA gain control pin current). C2 is needed to resonate the package parasitics to achieve the maximum attenuation values with attenuator current. With attenuator control pin current of 26 mA, C2 can be chosen to provide maximum attenuation. See the chart below for suggested component values and predicted performance at various reference frequencies. Component values can be interpolated for reference frequencies not listed. For lower frequencies the lumped element values can be used and the layout with unplaced component pads does not greatly affect the RF performance of the circuit. For frequencies greater than 500 MHz, component size and trace length have more influence on circuit performance. Smaller components and shorter trace lengths reduce the affects of the external component parasitics and interaction with the multichip module parasitics. 800 56 27 .01 DNP DNP 22 8.2 82 DNP 120 21 15 6.3 7.6 21.3 39 5.3 1850 56 3.6 .01 DNP DNP 12 DNP 33 DNP 120 12 8.6 11 7.7 22 40 7.9 1960 56 3.6 .01 DNP DNP 12 DNP 33 DNP 120 14 8.4 12 6.5 22 40 8.1 2140 56 3.6 .01 DNP DNP 12 DNP 33 DNP 120 13 8.4 11 5.6 22 40 8.2
DNP = Do Not Place (Component is not used in the design) 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 2 of 7 January 2006
VG025
S21 vs. Frequency
Vctrl=0V (Minimum attenuation)
The Communications Edge TM Product Information
High Linearity Variable Gain Amplifier
240 MHz Circuit Performance (VG025-PCB240)
S22 vs. Frequency
Vctrl=0V (Minimum attenuation)
S11 vs. Frequency
Vctrl=0V (Minimum attenuation)
20 18
0 -5 S22 (dB) -10 -15 -20
-40 C +25 C
260 280 S11 (dB)
0 -5 -10 -15 -20
S21 (dB)
16 14 12
+85 C
300
-40 C
+25 C
+85 C
-40 C
-25 200 220 240
+25 C
260
+85 C
280 300
10 200
220
240
-25 200
220
240
260
280
300
Frequency (MHz)
Frequency (MHz)
S11 vs. Frequency vs. Control Voltage
Frequency (MHz)
S21 vs. Frequency vs. Control Voltage
S22 vs. Frequency vs. Control Voltage
20 15 10 S21 (dB) S11 (dB) 5 0 -5 -10 -15 200
Vctrl=0.000V Vctrl=1.844V Vctrl=0.784V Vctrl=4.230V Vctrl=1.133V
0 -5 S22 (dB) -10 -15 -20 -25 -30 200
Vctrl=0.000V Vctrl=1.133V Vctrl=4.230V Vctrl=0.784V Vctrl=1.844V
0
Vctrl=0.000V Vctrl=0.784V Vctrl=1.844V
-5 -10 -15 -20 -25 -30 200
Vctrl=1.133V Vctrl=4.230V
220
240
260
280
300
220
240
260
280
300
220
240
260
280
300
Frequency (MHz)
P1dB vs. Frequency
Vctrl=0V (Minimum attenuation)
Frequency (MHz)
Phase change vs. Attenuation
25 C, 240 MHz
Frequency (MHz)
Noise Figure vs. Frequency
Vctrl=0V (Minimum attenuation)
26
50 phase change (deg) 40
NF (dB)
6 5 4 3 2 1 220
24 P1dB (dBm) 22 20 18
30 20 10 0
-40 C
16 230 235
+25 C
240
+85 C
245 250
-40 C
230 240
+25 C
250
+85 C
260
0
4
Frequency (MHz)
8 12 16 Attenuation (dB)
20
24
Frequency (MHz)
OIP3 vs. Attenuation Setting 45 OIP3 (dBm) 40 35 30 25 0 2 4 6 Attenuation (dB)
25 C, 240 MHz frequency = 240, 241 MHz, +5 dBm/tone, +25 C
OIP3 vs. Output Power 45 40 35 30 25 8 10 -4 +25 C +85 C 0 -40 C
frequency = 240, 241 MHz, 0dB Atten.
IMD products vs. Output Power -40 IMD products (dBc) -60 -80 -100 -120
fundamental frequency = 240, 241 MHz; +25 C, 0dB Atten
IMD_Low IMD_High
OIP3 (dBm)
4 8 Output Power (dBm)
Normalized Gain vs. Vctrl
25 C, 240 MHz
12
16
-4
0
4 8 Output Power (dBm) Ictrl vs. Vctrl
25 C
12
16
Gain vs. Pin 8 Attn. Control Current
15 Normalized Gain (dB) 10 Gain (dB) 5 0 -5 -10 0 5 10 15 20 25 Pin 8 Attenuation Control Current (mA) 0 -4
30 25 Ictrl (mA) 20 15 10 5 0
0 1 2 Vctrl (V) 3 4 5
-8 -12 -16 -20 -24
0
1
2 Vctrl (V)
3
4
5
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 3 of 7 January 2006
VG025
20 15 10 S21 (dB)
The Communications Edge TM Product Information
High Linearity Variable Gain Amplifier
800 MHz Circuit Performance (VG025-PCB800)
S21 vs. Frequency vs. Control Voltage S11 vs. Frequency vs. Control Voltage S22 vs. Frequency vs. Control Voltage
0 -5 S11 (dB) S22 (dB)
Vctrl=0.00V Vctrl=1.73V Vctrl=0.78V Vctrl=4.50V Vctrl=1.10V
0 -5 -10 -15 -20 -25 -30 700
Vctrl=0.00V Vctrl=1.73V Vctrl=0.78V Vctrl=4.50V Vctrl=1.10V
-10 -15 -20 -25 -30 700
5 0 -5 -10 -15 700
Vctrl=0.00V Vctrl=1.73V Vctrl=0.78V Vctrl=4.50V Vctrl=1.10V
800
900
1000
800
900
1000
800
900
1000
Frequency (MHz)
P1dB vs. Frequency
Vctrl=0V (Minimum attenuation)
Frequency (MHz)
Phase change vs. Attenuation
25 C, 800 MHz
Frequency (MHz)
Noise Figure vs. Frequency
Vctrl=0V (Maximum Gain Setting)
26 24 P1dB (dBm) 22 20 18
80 phase change (deg) 60
7 6 NF (dB) 5 4 3 700
40 20 0
-40 C
16 700
+25 C
800
+85 C
900 1000
0
4
Frequency (MHz)
8 12 Attenuation (dB)
16
20
800
900
1000
Frequency (MHz)
IMD products vs. Output Power -40
fundamental frequency = 240, 241 MHz; +25 C, 0dB Atten
OIP3 vs. Attenuation Setting 45
frequency = 800, 801 MHz, +5 dBm/tone, +25 C
OIP3 vs. Output Power 45 40 35 30 +25 C -40 C +85 C -120 -4 0 4 8 Output Power (dBm)
Normalized Gain vs. Vctrl
25 C, 800 MHz frequency = 800, 801 MHz, 0dB Atten.
OIP3 (dBm)
35 30 25 0 2 4 6 Attenuation (dB) 8 10
OIP3 (dBm)
40
IMD products (dBc)
-60 -80 -100
IMD_Low IMD_High
25 12 16
-4
0
4 8 Output Power (dBm)
12
16
Gain vs. Pin 8 Attn. Control Current
25 C, 800 MHz
Ictrl vs. Vctrl
25 C
16 12 Gain (dB) 8 4 0 -4 -8 0 5 10 15 20 25 Pin 8 Attenuation Control Current (mA) Normalized Gain (dB)
0 -4
30 25 Ictrl (mA) 20 15 10 5 0
0 1 2 Vctrl (V) 3 4 5
-8 -12 -16 -20 -24
0
1
2 Vctrl (V)
3
4
5
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 4 of 7 January 2006
VG025
10 5 S21 (dB)
The Communications Edge TM Product Information
High Linearity Variable Gain Amplifier
1960 MHz Circuit Performance (VG025-PCB2000)
S21 vs. Frequency vs. Control Voltage S11 vs. Frequency vs. Control Voltage S22 vs. Frequency vs. Control Voltage
0 -5 S11 (dB) -10 -15 -20 -25 1700
Vctrl=0.00V Vctrl=1.15V Vctrl=4.50V Vctrl=0.82V Vctrl=1.72V
0 -5 S22 (dB) -10 -15 -20 -25 1700
Vctrl=0.00V Vctrl=1.15V Vctrl=4.50V Vctrl=0.82V Vctrl=1.72V
0 -5
Vctrl=0.00V Vctrl=1.72V Vctrl=0.82V Vctrl=4.50V Vctrl=1.15V
-10 1700
1750
1800
1850
1900
1950
2000
1750
1800
1850
1900
1950
2000
1750
1800
1850
1900
1950
2000
Frequency (MHz)
P1dB vs. Frequency
Vctrl=0V (Minimum attenuation)
Frequency (MHz)
Phase change vs. Attenuation
25 C, 1900 MHz
Frequency (MHz)
Noise Figure vs. Frequency
Vctrl=0V (Maximum Gain Setting)
26
20 phase change (deg) 10
9 8 NF (dB) 7 6 5 4 1700
24 P1dB (dBm) 22 20 18 16 1700
0 -10 -20
1800
1900
2000
2100
2200
0
2
4
Frequency (MHz)
6 8 10 Attenuation (dB)
12
14
1800
1900
2000
2100
2200
Frequency (MHz)
IMD products vs. Output Power -40
fundamental frequency = 800, 801 MHz; +25 C, 0dB Atten
OIP3 vs. Attenuation Setting 45
frequency = 1960, 1961 MHz, +5 dBm/tone, +25 C
OIP3 vs. Output Power 45 40 35 30 +25 C -40 C +85 C -120 -4 0 4 8 Output Power (dBm)
Normalized Gain vs. Vctrl
25 C, 1900 MHz frequency = 1900, 1961 MHz, 0dB Atten.
OIP3 (dBm)
35 30 25 0 2 4 6 Attenuation (dB) 8 10
OIP3 (dBm)
40
IMD products (dBc)
-60 -80 -100
IMD_Low IMD_High
25 12 16
-4
0
4 8 Output Power (dBm)
12
16
Ictrl vs. Vctrl
25 C
Gain vs. Pin 8 Attn. Control Current
25 C, 1900 MHz
0 Normalized Gain (dB) -2
30 25 Ictrl (mA) 20 15 10 5 0
0 1 2 Vctrl (V) 3 4 5
10 8 6 Gain (dB) 4 2 0 -2 -4 -6 0 5 10 15 20 25 Pin 8 Attenuation Control Current (mA)
-4 -6 -8 -10 -12 -14
0
1
2 Vctrl (V)
3
4
5
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 5 of 7 January 2006
VG025
10 5 S21 (dB)
The Communications Edge TM Product Information
High Linearity Variable Gain Amplifier
2140 MHz Circuit Performance (VG025-PCB2000)
S21 vs. Frequency vs. Control Voltage S11 vs. Frequency vs. Control Voltage S22 vs. Frequency vs. Control Voltage
0 -5 S11 (dB) -10 -15 -20 -25 2100
Vctrl=0.00V Vctrl=1.72V Vctrl=0.82V Vctrl=4.50V Vctrl=1.15V
0 -5 S22 (dB) -10 -15 -20 -25 2100
Vctrl=0.00V Vctrl=1.72V Vctrl=0.82V Vctrl=4.50V Vctrl=1.15V
0 -5
Vctrl=0.00V Vctrl=1.72V Vctrl=0.82V Vctrl=4.50V Vctrl=1.15V
-10 2100
2120
2140
2160
2180
2200
2120
2140
2160
2180
2200
2120
2140
2160
2180
2200
Frequency (MHz)
P1dB vs. Frequency
Vctrl=0V (Minimum attenuation)
Frequency (MHz)
Phase change vs. Attenuation
25 C, 2140 MHz
Frequency (MHz)
Noise Figure vs. Frequency
Vctrl=0V (Maximum Gain Setting)
26
50 phase change (deg) 40
9 8 NF (dB) 7 6 5 4 1700
24 P1dB (dBm) 22 20 18 16 1700
30 20 10 0
1800
1900
2000
2100
2200
0
2
4
Frequency (MHz)
6 8 10 Attenuation (dB)
12
14
1800
1900
2000
2100
2200
Frequency (MHz)
IMD products vs. Output Power -40 IMD products (dBc) -60 -80 -100 -120
fundamental frequency = 2140, 2141 MHz; +25 C, 0dB Atten
OIP3 vs. Attenuation Setting 45 OIP3 (dBm) 40 35 30 25 0 2 4 6 Attenuation (dB)
25 C, 2140 MHz frequency = 2140, 2141 MHz, +5 dBm/tone, +25 C
OIP3 vs. Output Power 45 40 35 30 +25 C 25 8 10 -4 0 4 8 Output Power (dBm)
Normalized Gain vs. Vctrl
25 C, 2140 MHz frequency = 2140, 2141 MHz, 0dB Atten.
IMD_Low IMD_High
OIP3 (dBm)
-40 C
+85 C 12 16
-4
0
4 8 Output Power (dBm) Ictrl vs. Vctrl
25 C
12
16
Gain vs. Pin 8 Attn. Control Current
10 Normalized Gain (dB) 8 6 Gain (dB) 4 2 0 -2 -4 -6 0 5 10 15 20 25 Pin 8 Attenuation Control Current (mA) 0 -2
30 25 Ictrl (mA) 20 15 10 5 0
0 1 2 Vctrl (V) 3 4 5
-4 -6 -8 -10 -12 -14
0
1
2 Vctrl (V)
3
4
5
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 6 of 7 January 2006
VG025
The Communications Edge TM Product Information
High Linearity Variable Gain Amplifier
VG025-G Mechanical Information
This package is lead-free/RoHS-compliant. It is compatible with both lead-free (maximum 260C reflow temperature) and leaded (maximum 245C reflow temperature) soldering processes. The plating material on the pins is annealed matte tin over copper.
Outline Drawing
Product Marking
The component will be marked with a "VG025-G" designator with an 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.
ESD / MSL Information
ESD Rating: Value: Test: Standard: ESD Rating: Value: Test: Standard: MSL: Standard: Class 1B Passes 500V to <1000V Human Body Model (HBM) JEDEC Standard JESD22-A114 Class IV Passes 1000V to <2000V Charged Device Model (CDM) JEDEC Standard JESD22-C101 Level 2 @ 260 C convection reflow JEDEC Standard J-STD-020
Mounting Configuration / Land Pattern
Functional Pin Layout
N/C N/C N/C 14 16 N/C 1 N/C 2 N/C 3 RF IN 4 5 N/C 6 Interstage Match 7 N/C 8 Gain Control 15 N/C 13 12 RF OUT 11 N/C 10 Interstage Match 9 N/C
Thermal Specifications
Parameter
Operating Case Temperature Thermal Resistance, Rth (1) Junction Temperature, Tjc (2)
Function RF Input Gain Control Interstage Match RF Output / DC bias No Connect or GND Ground
MTTF vs. GND Tab Temperature
1000
Pin No 4 8 6, 10 12 All other pins Backside slug
Rating
-40 to +85 C 59 C / W 129 C
100
1. The thermal resistance is referenced from the hottest part of the junction to the backside ground copper tab. 2. This corresponds to the typical biasing condition of +5V, 150 mA at an 85 C case temperature. A minimum MTTF of 1 million hours is achieved for junction temperatures below 160 C.
10
1 60 70 80 90 100 Tab Temperature (C) 110
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 7 of 7
January 2006

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