APPLICATION NOTE SKY65047-360LF Matching Circuits for Various Frequency Bands Introduction S-Parameter and Noise Parameter Data Skyworks SKY65047-360LF is a high linearity Low Noise Amplifier (LNA) with an operational frequency of 0.4 to 3.0 GHz. The device is manufactured with an advanced SiGe process and operates with a single DC supply from 2.1 V to 3.8 V over a temperature range of –40 °C to +85 °C. S-parameter and noise parameter data for the SKY65047-360LF is presented in Tables 1 and 2, respectively. A system designer can use this information to simulate the input and output impedance, and the gain and Noise Figure (NF) performance. This Application Note provides S-parameter and noise parameter information needed to design application circuits using the SKY65047-360LF. Several matching schematics for various frequencies are also presented. Refer to the SKY65047-360LF Data Sheet (document #201084) for detailed specifications and additional information regarding SKY65047-360LF Evaluation Boards. Figure 1 shows simulation results using the parameters in Tables 1 and 2 with the SKY65047-360LF 450 MHz Evaluation Board. Table 1. SKY65047-360LF S-Parameters (1 of 2) Frequency (MHz) MagS11 AngS11 MagS21 AngS21 MagS12 AngS12 MagS22 AngS22 400 0.768537 –26.5748 11.83712 159.9963 0.016916 88.4548 0.496524 17.87421 450 0.744954 –29.3906 11.58071 154.9517 0.018833 85.5678 0.4843 11.4653 500 0.72065 –32.0175 11.28839 150.3434 0.020654 83.06927 0.473506 5.891828 550 0.69605 –34.4604 10.9746 146.103 0.022387 80.8882 0.463812 0.980433 600 0.67149 –36.726 10.64954 142.1797 0.024041 78.97156 0.455029 –3.39592 650 0.647229 –38.8223 10.32055 138.5336 0.025623 77.27801 0.44704 –7.33297 700 0.623463 –40.7584 9.992919 135.1325 0.027144 75.77429 0.43977 –10.9047 750 0.600333 –42.5436 9.670389 131.9495 0.028611 74.43299 0.433163 –14.1694 800 0.577936 –44.1874 9.355587 128.9618 0.03003 73.23111 0.427174 –17.1739 850 0.556335 –45.6988 9.050283 126.1496 0.031409 72.14917 0.421765 –19.9562 900 0.535564 –47.0867 8.755613 123.4956 0.032753 71.17049 0.4169 –22.5476 950 0.515638 –48.3595 8.472232 120.9847 0.034067 70.28081 0.412545 –24.9741 1000 0.496555 –49.5249 8.200447 118.6036 0.035356 69.46782 0.408668 –27.2573 1050 0.478303 –50.5902 7.940303 116.3403 0.036623 68.72094 0.405238 –29.4157 1100 0.460861 –51.5619 7.691662 114.1843 0.037873 68.03105 0.402226 –31.4645 1150 0.444201 –52.4461 7.454257 112.1261 0.039106 67.39029 0.399602 –33.4169 1200 0.428295 –53.2483 7.227729 110.1573 0.040327 66.79191 0.397341 –35.2841 1250 0.413111 –53.9735 7.011662 108.2703 0.041536 66.23011 0.395417 –37.0755 1300 0.398616 –54.6262 6.805609 106.4584 0.042736 65.69993 0.393807 –38.7993 1350 0.384778 –55.2104 6.609102 104.7154 0.043927 65.19713 0.39249 –40.4626 1400 0.371564 –55.7298 6.42167 103.036 0.04511 64.71813 0.391443 –42.0714 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201100A • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • June 23, 2009 1 APPLICATION NOTE • SKY65047-360LF MATCHING CIRCUITS Table 1. SKY65047-360LF S-Parameters (2 of 2) Frequency (MHz) MagS11 AngS11 –56.1875 MagS21 6.242848 AngS21 101.4151 MagS12 0.046287 AngS12 64.25992 MagS22 0.39065 1450 0.358945 1500 0.34689 –56.5865 6.07218 99.84825 0.047458 63.82003 0.390092 –45.1457 1550 0.335372 –56.9294 5.909228 98.33145 0.048622 63.39645 0.389754 –46.6198 1600 0.324366 –57.2183 5.75357 96.86102 0.049782 62.98765 0.389621 –48.0565 1650 0.313847 –57.4554 5.604805 95.43363 0.050936 62.59257 0.389681 –49.4589 1700 0.303795 –57.6425 5.462554 94.04624 0.052084 62.21064 0.389921 –50.8297 1750 0.294191 –57.781 5.326461 92.69608 0.053227 61.84184 0.390331 –52.1713 1800 0.28502 –57.8726 5.19619 91.38059 0.054363 61.48687 0.390903 –53.4857 1850 0.27627 –57.9185 5.071431 90.09744 0.055492 61.14737 0.391631 –54.775 1900 0.267935 –57.9202 4.951895 88.84442 0.056613 60.82632 0.392511 –56.0411 1950 0.260016 –57.8795 4.837321 87.61943 0.057724 60.52886 0.393542 –57.2858 2000 0.252527 –57.7989 4.727476 86.42038 0.058825 60.26366 0.39473 –58.5114 2050 0.245502 –57.6832 4.622164 85.24506 0.059915 60.04586 0.396089 –59.7208 2100 0.239009 –57.5426 4.52124 84.09072 0.060996 59.90318 0.397648 –60.9187 2150 0.23319 –57.4032 4.42463 82.95319 0.062082 59.89007 0.399467 –62.1149 2200 0.228334 –57.3427 4.33236 81.82378 0.063239 60.12157 0.401654 –63.3347 2250 0.224922 –57.6406 4.244301 80.67861 0.064781 60.8333 0.404336 –64.6584 2300 0.221853 –59.3599 4.156561 79.45196 0.068237 61.9623 0.406519 –66.3436 2350 0.205022 –62.1179 4.052027 78.29577 0.07413 59.30318 0.401508 –68.0019 2400 0.188892 –59.6401 3.962515 77.4864 0.073723 55.59007 0.399142 –68.3676 2450 0.183419 –57.4712 3.88748 76.57823 0.072901 54.67081 0.401521 –69.0279 2500 0.179318 –56.2237 3.814645 75.61817 0.073028 54.34994 0.404099 –69.9208 2550 0.1752 –55.3204 3.743376 74.65132 0.073606 54.09799 0.406469 –70.8861 2600 0.171025 –54.542 3.673928 73.69045 0.074396 53.83271 0.408697 –71.8724 2650 0.16686 –53.805 3.606435 72.73942 0.075295 53.54478 0.410845 –72.862 2700 0.162756 –53.0735 3.540925 71.79942 0.076257 53.237 0.412951 –73.8477 2750 0.158747 –52.3298 3.477378 70.87069 0.077257 52.91348 0.415036 –74.8263 –43.6309 2800 0.154853 –51.5647 3.415747 69.95312 0.078281 52.57764 0.417113 –75.7964 2850 0.151086 –50.773 3.35597 69.04645 0.07932 52.2321 0.419189 –76.7573 2900 0.147453 –49.9516 3.297984 68.15034 0.080368 51.87883 0.421267 –77.7086 2950 0.143957 –49.0989 3.241722 67.26445 0.081424 51.51927 0.42335 –78.6502 3000 0.1406 –48.214 3.187116 66.38843 0.082483 51.15454 0.425439 –79.5823 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 2 AngS22 June 23, 2009 • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • 201100A APPLICATION NOTE • SKY65047-360LF MATCHING CIRCUITS Table 2. SKY65047-360LF Noise Parameters (1 of 2) Frequency (MHz) Min. NF (dB) Min. NF Source Reflection Coefficient Reflection Coefficient Phase (deg) Normalized Effective Noise Resistance 400 0.66854088 0.161129 21.49795 0.102482 450 0.669528092 0.16188 24.08635 0.102287 500 0.671195133 0.162201 26.70935 0.102063 550 0.673322655 0.162287 29.35811 0.101811 600 0.675801419 0.162238 32.02817 0.101532 650 0.678573564 0.162109 34.71721 0.101226 700 0.681606769 0.161933 37.42403 0.100895 750 0.684882082 0.161732 40.14802 0.100538 800 0.688387842 0.161521 42.88883 0.100156 850 0.692116514 0.161311 45.6462 0.099751 900 0.696062955 0.161112 48.41988 0.099324 950 0.700223451 0.160933 51.20955 0.098874 1000 0.704595152 0.160781 54.01476 0.098403 1050 0.709175746 0.160664 56.8349 0.097912 1100 0.713963263 0.160588 59.6692 0.097402 1150 0.71895595 0.160561 62.5167 0.096873 1200 0.724152209 0.160588 65.37622 0.096327 1250 0.729550552 0.160676 68.24642 0.095765 1300 0.73514958 0.16083 71.12572 0.095188 1350 0.740947975 0.161057 74.01241 0.094596 1400 0.746944503 0.161361 76.90455 0.093992 1450 0.753138024 0.161746 79.8001 0.093377 1500 0.759527504 0.162219 82.69684 0.09275 1550 0.766112048 0.162781 85.59251 0.092115 1600 0.772890932 0.163436 88.48473 0.091472 1650 0.779863659 0.164188 91.37116 0.090823 1700 0.787030035 0.165037 94.24945 0.090168 1750 0.794390286 0.165984 97.11739 0.089511 1800 0.801945241 0.16703 99.97296 0.088851 1850 0.809696624 0.168173 102.8145 0.088192 1900 0.817647551 0.169411 105.6407 0.087535 1950 0.825803408 0.170737 108.4514 0.086882 2000 0.834173511 0.172142 111.2477 0.086237 2050 0.842774452 0.17361 114.0335 0.085603 2100 0.851637425 0.175109 116.8181 0.084989 2150 0.86082585 0.176573 119.6235 0.084408 2200 0.870481692 0.177851 122.5033 0.083895 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201100A • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • June 23, 2009 3 APPLICATION NOTE • SKY65047-360LF MATCHING CIRCUITS Table 2. SKY65047-360LF Noise Parameters (2 of 2) Frequency (MHz) Min. NF (dB) Min. NF Source Reflection Coefficient Reflection Coefficient Phase (deg) Normalized Effective Noise Resistance 2250 0.880941082 0.178538 125.601 0.083556 2300 0.892559692 0.17785 129.1724 0.083685 2350 0.900648512 0.179664 131.5663 0.083613 2400 0.905880996 0.186456 132.348 0.082048 2450 0.914690749 0.190481 134.2928 0.081014 2500 0.924608037 0.193386 136.5962 0.080308 2550 0.934871997 0.196047 138.9528 0.079722 2600 0.945338035 0.198681 141.2943 0.079198 2650 0.955976638 0.201348 143.6033 0.078715 2700 0.96678279 0.204064 145.8744 0.078269 2750 0.977757187 0.206834 148.1061 0.077857 2800 0.988901749 0.209658 150.2984 0.077479 2850 1.00021849 0.212532 152.4516 0.077137 2900 1.01170924 0.215453 154.5661 0.076831 2950 1.02337567 0.218417 156.6427 0.076564 3000 1.03521925 0.22142 158.6819 0.076337 Figure 1. S-Parameter and Noise Parameter Simulation Results for 450 MHz Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 4 June 23, 2009 • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • 201100A APPLICATION NOTE • SKY65047-360LF MATCHING CIRCUITS Matching Circuits The SKY65047-360LF LNA can be used for various 0.4 to 3.0 GHz applications such as WLANs, WiMAX systems, cellular base stations, GPS receivers, satellite receivers, remote metering, or test instrumentation. Matching circuit schematics for 450 MHz, 915 MHz, 1227 MHz, 1575 MHz, 1730 MHz, 1960 MHz, and 2450 MHz are shown in Figures 2 through 8. Optional Decoupling Capacitors Enable C9 1 μF VCC 8 1 GND C4 22 nF L1 4.3 pF EN RF_IN C16 1 μF RF Output C8 6.8 pF 6 GND BIAS_R 5 4 L6 1 nH C13 10 nF RF_OUT/BIAS 3 C3 30 nH C12 56 pF L3 30 nH 7 2 RF Input R3 150 Ω GND R1 4.7 kΩ VBIAS VCC S1546 Figure 2. 450 MHz Matching Circuit 450 MHz The 450 MHz matching circuit connects a 1 nH degeneration inductor to pin 3. Test results: Gain: NF: IIP3: Current: 21.44 dB 1.34 dB –4 dBm 6.47 mA Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201100A • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • June 23, 2009 5 APPLICATION NOTE • SKY65047-360LF MATCHING CIRCUITS Optional Decoupling Capacitors Enable C9 1 μF VCC 8 1 GND C4 22 nF L1 6.8 nH RF_IN C13 10 nF RF_OUT/BIAS 3 C16 1 μF RF Output C5 2.2 pF 6 GND BIAS_R 5 4 L6 1 nH C12 56 pF L3 12 nH 7 2 RF Input C3 0.7 pF EN R3 180 Ω GND R1 4.7 kΩ VBIAS VCC S1497 Figure 3. 915 MHz Matching Circuit 915 MHz The 915 MHz matching circuit connects a 1 nH degeneration inductor to pin 3. Test results: Gain: NF: IIP3: Current: 17.3 dB 0.9 dB +3 dBm 7.0 mA Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 6 June 23, 2009 • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • 201100A APPLICATION NOTE • SKY65047-360LF MATCHING CIRCUITS Optional Decoupling Capacitors Enable C7 1 μF VCC 1 8 GND C1 22 nF L1 4.3 nH EN 2 C4 22 pF L2 6.8 nH C5 10 nF C8 1 μF 7 RF_IN RF Input R2 220 Ω RF_OUT/BIAS 3 RF Output C3 3.0 pF 6 GND BIAS_R 4 5 GND R1 4.7 kΩ VBIAS VCC S1547 Figure 4. 1227 MHz Matching Circuit 1227 MHz Test results: Gain: NF: IIP3: Current: 19.5 dB 0.92 dB +1.6 dBm 6.1 mA Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201100A • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • June 23, 2009 7 APPLICATION NOTE • SKY65047-360LF MATCHING CIRCUITS Optional Decoupling Capacitors Enable C7 1 μF VCC 1 8 GND C1 22 nF L1 2.7 nH EN 2 C4 22 pF L2 8.2 nH C5 10 nF C8 1 μF 7 RF_IN RF Input R2 180 Ω RF_OUT/BIAS 3 RF Output C3 3.6 pF 6 GND BIAS_R 4 5 GND R1 4.7 kΩ VBIAS VCC S1498 Figure 5. 1575 MHz Matching Circuit 1575 MHz Test results: Gain: NF: IIP3: Current: 16.5 dB 0.75 dB 0 dBm 6.7 mA Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 8 June 23, 2009 • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • 201100A APPLICATION NOTE • SKY65047-360LF MATCHING CIRCUITS Optional Decoupling Capacitors Enable C9 1 μF VCC 1 8 GND L1 3.9 nH C4 22 nF 2 L3 4.3 nH C12 10 pF R3 180 Ω C13 10 nF C16 1 μF 7 RF_IN RF Input C2 1.1 pF EN RF_OUT/BIAS 3 RF Output C5 1.5 pF 6 GND BIAS_R 4 5 GND R1 4.7 kΩ VBIAS VCC S1548 Figure 6. 1730 MHz Matching Circuit 1730 MHz Test results: Gain: NF: IIP3: Current: 16.8 dB 0.82 dB +3.4 dBm 5.8 mA Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201100A • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • June 23, 2009 9 APPLICATION NOTE • SKY65047-360LF MATCHING CIRCUITS Optional Decoupling Capacitors Enable C9 1 μF VCC 1 8 GND L1 3.3 nH C4 22 nF 2 L3 3.9 nH C12 10 pF R3 180 Ω C13 10 nF C16 1 μF 7 RF_IN RF Input C2 1.1 pF EN RF_OUT/BIAS 3 RF Output C5 1.5 pF 6 GND BIAS_R 4 5 GND R1 4.7 kΩ VBIAS VCC S1549 Figure 7. 1960 MHz Matching Circuit 1960 MHz Test results: Gain: NF: IIP3: Current: 15.7 dB 0.92 dB +5.5 dBm 5.7 mA Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 10 June 23, 2009 • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • 201100A APPLICATION NOTE • SKY65047-360LF MATCHING CIRCUITS Optional Decoupling Capacitors Enable C9 1 μF VCC GND L1 1.8 nH C4 22 nF C13 10 nF C16 1 μF L3 68 nH 7 RF_IN C2 1.1 pF EN 2 RF Input C12 10 pF 8 1 RF_OUT/BIAS 3 RF Output C5 R2 22 nF C6 130 Ω 3.3 nH 6 GND BIAS_R 5 4 GND L2 1.5 pF R1 4.7 kΩ VBIAS L7 12 nH C14 10 nF VCC S1550 Figure 8. 2450 MHz Matching Circuit 2450 MHz The 2450 MHz matching circuit includes optional components R2, L7, and C14. These components could help to maintain stability and allow a higher gain at this high frequency. Test results: Gain: NF: IIP3: Current: 15.7 dB 0.95 dB +6.5 dBm 6.8 mA Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201100A • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • June 23, 2009 11 APPLICATION NOTE • SKY65047-360LF MATCHING CIRCUITS Bias Reference Setting 1. 915 MHz Pin 6 of the SKY65047-360 LF, BIAS_R, should connect to resistor R1 to set the bias reference voltage. Normally, a 4.7 kΩ resistor is used. This value sets the current to about 6.8 mA, which can be increased or decreased by changing the value of this component. 2. 1575 MHz The Table below provides a sample list of R1 values and corresponding currents. Table 3. R1 Values vs Current Resistor R1 Value (kΩ) Current (mA) 5.6 5.8 4.7 6.8 3.0 9.8 1.8 17.0 Evaluation Boards The SKY65047-360LF Data Sheet (document #201084) provides assembly drawings for the following three Evaluation Boards: 3. 2450 MHz For each of these test boards, connector P1 is for the DC power supply. Pin 1 of this connector (the leftmost pin looking from the top of the board) enables the LNA. This is normally 3.3 V DC. Pin 2 of this connector (the middle pin) is ground, and pin 3 (the rightmost pin looking from the top of the board) is the VCC supply (3.3 V). There are two internal circuits for each Evaluation Board. One circuit is from SMA connector J1 (LNA input) to connector J2 (LNA output). This circuit is used to measure the fully matched LNA performance, which includes all the needed matching components. The second internal circuit is from SMA connector J3 (LNA input) to J4 (LNA output). This circuit only has a DC supply and biasing components but no matching components for input and output. Use this circuit to measure the LNA impedance or the full Sperformance data if needed. Copyright © 2009 Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein. Skyworks may change its documentation, products, services, specifications or product descriptions at any time, without notice. Skyworks makes no commitment to update the materials or information and shall have no responsibility whatsoever for conflicts, incompatibilities, or other difficulties arising from any future changes. 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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 12 June 23, 2009 • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • 201100A