VG025

VG025 WJCI | Alldatasheet

Document overview

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Technical content

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 High Linearity Variable Gain Amplifier Product Information The Communications Edge TM Product Features

• Tunable within 50 – 2200 MHz
• 21 dB Attenuation Range
• 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 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 dB m 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/RoHS- compliant 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 +85º C. All devices are 100% RF & DC tested and packaged on tape and reel for automated surface-mount assembly. Functional Diagram Function Pin Number RF Input 4 Gain Control 8 Interstage Match 6, 10 RF Output / DC bias 12 No Connect or GND All other pins Ground Backside slug Specifications (1) Parameter Units Min Typ Max Operational Bandwidth MHz 50 2200 Test Frequency MHz 800 Gain (2) dB 13.5 15 Input Return Loss (2) dB 6.3 Output Return Loss (2) dB 7.6 Output P1dB dBm 21.3 Output IP3 (3) dBm 37 39 Noise Figure (2) dB 5.3 Gain Variation Range (4) dB 16 21 24 Gain Variation Control Voltage (5) V 0 4.5 Supply Voltage V 5 Operating Current Range mA 120 150 180 Gain Control Pin Current mA 26 28 1. Test conditions unless otherwise noted: 25ºC, Vsuppl y = +5 V, in tuned application circuit. Vctrl is the control voltage through the 120 Ω dropping resistor as shown in the application circuit on page 2. 2. Specifications refer to the device at the max imum 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 po wer 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 diff erence in gain with Vctrl = 0 and 4.5V at 800 MHz. 5. This voltage refers to the V CTRL as shown in the circuit schema tic on page 2. There should be a series resistance of 120Ω between the control voltage and pin 8 for proper operation. Absolute Maximum Rating Parameter Rating Operating Case Temperature -40 to +85 °C Storage Temperature -55 to +125 °C Amplifier Supply Voltage (pin 12) +6 V Pin 8 (Gain Control) Current 30 mA RF Input Power (continuous) 4 dB above Input P1dB Junction Temperature +220 °C Operation of this device above any of these parameters may cause permanent damage. Typical Performance (1) Parameter Units Typical Frequency MHz 240 800 1960 2140 Gain (2) dB 15.4 15 8.4 8.4 Input Return Loss (2) dB 11 6.3 12 11 Output Return Loss (2) dB 11 7.6 6.5 5.6 Output P1dB dBm 21.8 21.3 22 22 Output IP3 (3) dBm 42 39 40 40 Noise Figure (2) dB 4.5 5.3 8.1 8.2 Gain Variation Range dB 20 21 14 13

Ordering Information

Part No. Description VG025-G 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 N/C Interstage Match 16 15 14 13 5 6 7 8 RF OUT N/C Interstage Match N/C N/C N/C N/C RF IN N/C N/C N/C N/C N/C Gain Control

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 High Linearity Variable Gain Amplifier Product Information The Communications Edge TM Application Circuit Configurations Circuit Board Material: .014” FR-4, 4 layers, .062” total thickness The WJ VG025 variable gain amplifier can op erate 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 circu it uses voltage a pplied 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 whil e still having resonant frequency about 30% greater than the Reference frequency (this allows for good isolation and inductor variation). Next c hoose L3 and C9 for interstage matching. C9 is only needed fo r 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 th e 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 le ngth have more influence on circuit performance. Smaller co mponents and shorter trace lengths reduce the affects of the external component parasitics and interaction with the multichip module parasitics. Reference Frequency MHz 240 800 1850 1960 2140 C1, C5 pF 1000 56 56 56 56 C2 pF 0 Ω 27 3.6 3.6 3.6 C6 pF DNP DNP DNP DNP DNP C9 pF 1.2 DNP DNP DNP DNP L1, L2 nH 220 22 12 12 12 L3 nH 47 8.2 DNP DNP DNP L4 nH DNP 82 33 33 33 R1 Ω DNP DNP DNP DNP DNP R2 Ω 120 120 120 120 120 Attenuation Range dB 20 21 12 14 13 Maximum Gain dB 15.4 15 8.6 8.4 8.4 Input Return Loss dB 11 6.3 11 12 11 Output Return Loss dB 11 7.6 7.7 6.5 5.6 Output P1dB dBm 21.8 21.3 22 22 22 Output IP3 dBm 42 39 40 40 40 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 3 of 7 January 2006 VG025 High Linearity Variable Gain Amplifier Product Information The Communications Edge TM

240 MHz Circuit Performance (VG025-PCB240)

S21 vs. Frequency Vctrl=0V (Minimum attenuation) 200 220 240 260 280 300 Frequency (MHz) S21 (dB) S22 vs. Frequency Vctrl=0V (Minimum attenuation) -25 -20 -15 -10 200 220 240 260 280 300 Frequency (MHz) S22 (dB) S11 vs. Frequency Vctrl=0V (Minimum attenuation) -25 -20 -15 -10 200 220 240 260 280 300 Frequency (MHz) S11 (dB) S21 vs. Frequency vs. Control Voltage -15 -10 200 220 240 260 280 300 Frequency (MHz) S21 (dB) Vctrl=0.000V Vctrl=0.784V Vctrl=1.133V Vctrl=1.844V Vctrl=4.230V S11 vs. Frequency vs. Control Voltage -30 -25 -20 -15 -10 200 220 240 260 280 300 Frequency (MHz) S11 (dB) Vctrl=0.000V Vctrl=0.784V Vctrl=1.133V Vctrl=1.844V Vctrl=4.230V S22 vs. Frequency vs. Control Voltage -30 -25 -20 -15 -10 200 220 240 260 280 300 Frequency (MHz) S22 (dB) Vctrl=0.000V Vctrl=0.784V Vctrl=1.133V Vctrl=1.844V Vctrl=4.230V P1dB vs. Frequency Vctrl=0V (Minimum attenuation) 230 235 240 245 250 Frequency (MHz) P1dB (dBm) Phase change vs. Attenuation 25 °C, 240 MHz 0 4 8 1 21 62 02 4 Attenuation (dB) phase change (deg) Noise Figure vs. Frequency Vctrl=0V (Minimum attenuation) 220 230 240 250 260 Frequency (MHz) NF (dB) OIP3 vs. Attenuation Setting frequency = 240, 241 MHz, +5 dBm/tone, +25 °C 02468 1 0 Attenuation (dB) OIP3 (dBm) OIP3 vs. Output Power frequency = 240, 241 MHz, 0dB Atten. -4 0 4 8 12 16 Output Power (dBm) OIP3 (dBm) +25 °C -40 °C +85 °C IMD products vs. Output Power fundamental frequency = 240, 241 MHz; +25 °C, 0dB Atten -120 -100 -80 -60 -40 -4 0 4 8 12 16 Output Power (dBm) IMD products (dBc) IMD_Low IMD_High Gain vs. Pin 8 Attn. Control Current 25 °C, 240 MHz -10 0 5 10 15 20 25 Pin 8 Attenuation Control Current (mA) Gain (dB) Normalized Gain vs. Vctrl 25 °C, 240 MHz -24 -20 -16 -12 012345 Vctrl (V) Normalized Gain (dB) Ictrl vs. Vctrl 25 °C 012345 Vctrl (V) Ictrl (mA)

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 High Linearity Variable Gain Amplifier Product Information The Communications Edge TM

800 MHz Circuit Performance (VG025-PCB800)

S21 vs. Frequency vs. Control Voltage -15 -10 700 800 900 1000 Frequency (MHz) S21 (dB) Vctrl=0.00V Vctrl=0.78V Vctrl=1.10V Vctrl=1.73V Vctrl=4.50V S11 vs. Frequency vs. Control Voltage -30 -25 -20 -15 -10 700 800 900 1000 Frequency (MHz) S11 (dB) Vctrl=0.00V Vctrl=0.78V Vctrl=1.10V Vctrl=1.73V Vctrl=4.50V S22 vs. Frequency vs. Control Voltage -30 -25 -20 -15 -10 700 800 900 1000 Frequency (MHz) S22 (dB) Vctrl=0.00V Vctrl=0.78V Vctrl=1.10V Vctrl=1.73V Vctrl=4.50V P1dB vs. Frequency Vctrl=0V (Minimum attenuation) 700 800 900 1000 Frequency (MHz) P1dB (dBm) Phase change vs. Attenuation 25 °C, 800 MHz 0 4 8 12 16 20 Attenuation (dB) phase change (deg) Noise Figure vs. Frequency Vctrl=0V (Maximum Gain Setting) 700 800 900 1000 Frequency (MHz) NF (dB) OIP3 vs. Attenuation Setting frequency = 800, 801 MHz, +5 dBm/tone, +25 °C 02468 1 0 Attenuation (dB) OIP3 (dBm) OIP3 vs. Output Power frequency = 800, 801 MHz, 0dB Atten. -4 0 4 8 12 16 Output Power (dBm) OIP3 (dBm) IMD products vs. Output Power fundamental frequency = 240, 241 MHz; +25 °C, 0dB Atten -120 -100 -80 -60 -40 -4 0 4 8 12 16 Output Power (dBm) IMD products (dBc) IMD_Low IMD_High Gain vs. Pin 8 Attn. Control Current 25 °C, 800 MHz 0 5 10 15 20 25 Pin 8 Attenuation Control Current (mA) Gain (dB) Normalized Gain vs. Vctrl 25 °C, 800 MHz -24 -20 -16 -12 012345 Vctrl (V) Normalized Gain (dB) Ictrl vs. Vctrl 25 °C 012345 Vctrl (V) Ictrl (mA)

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 High Linearity Variable Gain Amplifier Product Information The Communications Edge TM

1960 MHz Circuit Performance (VG025-PCB2000)

S21 vs. Frequency vs. Control Voltage -10 1700 1750 1800 1850 1900 1950 2000 Frequency (MHz) S21 (dB) Vctrl=0.00V Vctrl=0.82V Vctrl=1.15V Vctrl=1.72V Vctrl=4.50V S11 vs. Frequency vs. Control Voltage -25 -20 -15 -10 1700 1750 1800 1850 1900 1950 2000 Frequency (MHz) S11 (dB) Vctrl=0.00V Vctrl=0.82V Vctrl=1.15V Vctrl=1.72V Vctrl=4.50V S22 vs. Frequency vs. Control Voltage -25 -20 -15 -10 1700 1750 1800 1850 1900 1950 2000 Frequency (MHz) S22 (dB) Vctrl=0.00V Vctrl=0.82V Vctrl=1.15V Vctrl=1.72V Vctrl=4.50V P1dB vs. Frequency Vctrl=0V (Minimum attenuation) 1700 1800 1900 2000 2100 2200 Frequency (MHz) P1dB (dBm) Phase change vs. Attenuation 25 °C, 1900 MHz -20 -10 0 2 4 6 8 1 01 21 4 Attenuation (dB) phase change (deg) Noise Figure vs. Frequency Vctrl=0V (Maximum Gain Setting) 1700 1800 1900 2000 2100 2200 Frequency (MHz) NF (dB) OIP3 vs. Attenuation Setting frequency = 1960, 1961 MHz, +5 dBm/tone, +25 °C 02468 1 0 Attenuation (dB) OIP3 (dBm) OIP3 vs. Output Power frequency = 1900, 1961 MHz, 0dB Atten. -4 0 4 8 12 16 Output Power (dBm) OIP3 (dBm) IMD products vs. Output Power fundamental frequency = 800, 801 MHz; +25 °C, 0dB Atten -120 -100 -80 -60 -40 -4 0 4 8 12 16 Output Power (dBm) IMD products (dBc) IMD_Low IMD_High Gain vs. Pin 8 Attn. Control Current 25 °C, 1900 MHz 0 5 10 15 20 25 Pin 8 Attenuation Control Current (mA) Gain (dB) Normalized Gain vs. Vctrl 25 °C, 1900 MHz -14 -12 -10 012345 Vctrl (V) Normalized Gain (dB) Ictrl vs. Vctrl 25 °C 012345 Vctrl (V) Ictrl (mA)

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 High Linearity Variable Gain Amplifier Product Information The Communications Edge TM

2140 MHz Circuit Performance (VG025-PCB2000)

S21 vs. Frequency vs. Control Voltage -10 2100 2120 2140 2160 2180 2200 Frequency (MHz) S21 (dB) Vctrl=0.00V Vctrl=0.82V Vctrl=1.15V Vctrl=1.72V Vctrl=4.50V S11 vs. Frequency vs. Control Voltage -25 -20 -15 -10 2100 2120 2140 2160 2180 2200 Frequency (MHz) S11 (dB) Vctrl=0.00V Vctrl=0.82V Vctrl=1.15V Vctrl=1.72V Vctrl=4.50V S22 vs. Frequency vs. Control Voltage -25 -20 -15 -10 2100 2120 2140 2160 2180 2200 Frequency (MHz) S22 (dB) Vctrl=0.00V Vctrl=0.82V Vctrl=1.15V Vctrl=1.72V Vctrl=4.50V P1dB vs. Frequency Vctrl=0V (Minimum attenuation) 1700 1800 1900 2000 2100 2200 Frequency (MHz) P1dB (dBm) Phase change vs. Attenuation 25 °C, 2140 MHz 0 2 4 6 8 10 12 14 Attenuation (dB) phase change (deg) Noise Figure vs. Frequency Vctrl=0V (Maximum Gain Setting) 1700 1800 1900 2000 2100 2200 Frequency (MHz) NF (dB) OIP3 vs. Attenuation Setting frequency = 2140, 2141 MHz, +5 dBm/tone, +25 °C 02468 1 0 Attenuation (dB) OIP3 (dBm) OIP3 vs. Output Power frequency = 2140, 2141 MHz, 0dB Atten. -4 0 4 8 12 16 Output Power (dBm) OIP3 (dBm) IMD products vs. Output Power fundamental frequency = 2140, 2141 MHz; +25 °C, 0dB Atten -120 -100 -80 -60 -40 -4 0 4 8 12 16 Output Power (dBm) IMD products (dBc) IMD_Low IMD_High Gain vs. Pin 8 Attn. Control Current 25 °C, 2140 MHz 0 5 10 15 20 25 Pin 8 Attenuation Control Current (mA) Gain (dB) Normalized Gain vs. Vctrl 25 °C, 2140 MHz -14 -12 -10 012345 Vctrl (V) Normalized Gain (dB) Ictrl vs. Vctrl 25 °C 012345 Vctrl (V) Ictrl (mA)

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 VG025 High Linearity Variable Gain Amplifier Product Information The Communications Edge TM VG025-G Mechanical Information This package is lead-free/RoHS-compliant. It is compatible with both lead-free (maximum 260°C reflow temperature) and leaded (maximum 245°C reflow temperature) soldering processes. The plating material on the pins is annealed matte tin over copper. Outline Drawing Mounting Configuration / Land Pattern Thermal Specifications Parameter Rating Operating Case Temperature -40 to +85 °C Thermal Resistance, Rth (1) 59 °C / W Junction Temperature, Tjc (2) 129 °C 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. 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: Class 1B Value: Passes 500V to <1000V Test: Human Body Model (HBM) Standard: JEDEC Standard JESD22-A114 ESD Rating: Class IV Value: Passes 1000V to <2000V Test: Charged Device Model (CDM) Standard: JEDEC Standard JESD22-C101 MSL: Level 2 @ 260 ˚C convection reflow Standard: JEDEC Standard J-STD-020 Functional Pin Layout Function Pin No RF Input 4 Gain Control 8 Interstage Match 6, 10 RF Output / DC bias 12 No Connect or GND All other pins Ground Backside slug MTTF vs. GND Tab Temperature 100 1000 60 70 80 90 100 110 Tab Temperature (°C) N/C Interstage Match 16 15 14 13 5 6 7 8 RF OUT N/C Interstage Match N/C N/C N/C N/C RF IN N/C N/C N/C N/C N/C Gain Control