BigBoss
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Yesterday, 13:55BigBoss replied to a thread Insertion loss reduction for matching networks in PA design in RF, Microwave, Antennas and OpticsIf the Impedance Matching Circuit has been carefully designed, S11,GammaS,GammaL and S22 will all be zero (ideal case) so what rests ?? Just S21....8 replies | 364 view(s)
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Yesterday, 11:07BigBoss replied to a thread Insertion loss reduction for matching networks in PA design in RF, Microwave, Antennas and OpticsNo.. You're doing a serious mistake.. If there is a Optimum Load Impedance to be matched to 50 Ohm, the Generator Impedance ( call it as Port-1)...8 replies | 364 view(s)
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Yesterday, 10:10BigBoss replied to a thread Insertion loss reduction for matching networks in PA design in RF, Microwave, Antennas and OpticsBut this Insertion Loss is according to 50/50Ohm Terminations and if you change Optimum Load Impedance with Source Impedance, the Insertion Loss...8 replies | 364 view(s)
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Yesterday, 01:32BigBoss replied to a thread Insertion loss reduction for matching networks in PA design in RF, Microwave, Antennas and Optics-You presume that the PA has 50 Ohm Optimum Load Impedance right ?? But it's not practically true..Have you ever really found it as 50 Ohm ?? I...8 replies | 364 view(s)
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16th November 2019, 11:21BigBoss replied to a thread Broad band dsign of LNA best topology in RF, Microwave, Antennas and OpticsFollow the Textbook of Thomas Lee..7 replies | 307 view(s)
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16th November 2019, 04:08BigBoss replied to a thread Keysight ADS ground connection in schematic not reflected in layout in RF, Microwave, Antennas and OpticsYou have to use VIAs, no way out.Is there any other possibility to connect a Stub to GND in reality ?? No.. So, VIAs are necessary..In order to...4 replies | 220 view(s)
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16th November 2019, 01:00BigBoss replied to a thread Is it possible to eliminate harmonics when operated in compression in RF, Microwave, Antennas and OpticsYou can filter them out..or you can also apply linearization techniques or you can use more linear device with an appropriate biasing.2 replies | 133 view(s)
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15th November 2019, 12:55BigBoss replied to a thread Broad band dsign of LNA best topology in RF, Microwave, Antennas and OpticsDistributed Microwave Amplifiers are also very popular for wide-band applications.7 replies | 307 view(s)
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15th November 2019, 12:54BigBoss replied to a thread Reflections when conjugately matched in RF, Microwave, Antennas and OpticsResearched in my literature and found very intuitive explanation about Power Waves and Scattering "Microwave Transistor Amplifiers-Analysis and...3 replies | 282 view(s)
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13th November 2019, 19:28BigBoss replied to a thread Broad band dsign of LNA best topology in RF, Microwave, Antennas and OpticsCascode Configuration is most common one.7 replies | 307 view(s)
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13th November 2019, 16:31C(Farad)=1/{2*PI*Imag}4 replies | 265 view(s)
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12th November 2019, 23:15BigBoss replied to a thread Current and degeneration resistor in input pair in Analog Circuit DesignDegeneration Resistors improve the linearity,increase the Input Resistance that's all.. There is no closed form equation for Calculation of...3 replies | 180 view(s)
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12th November 2019, 20:38They can also be used to achieve PTAT Current by well adjusting Resistor and Transistor Multiplication number..3 replies | 188 view(s)
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12th November 2019, 20:31BigBoss replied to a thread [moved] Video transmitter for TV in Hobby Circuits and Small Projects ProblemsTransmitting Digital TV Signal is not easy because it needs a IQ Digital Modulation and obtaining this IQ Digital Video Signal is not easy. On the...1 replies | 151 view(s)
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10th November 2019, 23:49If you know S-Parameters, you can transform them into Z-Parameters by using well known equations.4 replies | 265 view(s)
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10th November 2019, 23:48BigBoss replied to a thread Wire bonding simulation in a low noise application in RF, Microwave, Antennas and OpticsIf you are able to access CST license, use it to simulate the bond-wire.It will give you an quite accurate result. But bond-wire can show some...1 replies | 198 view(s)
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8th November 2019, 17:40You can do PSS+PNOISE Analysis but the accuracy won't be so good.Because the most difficult part of a modelization is to predict Low Frequency Noise...1 replies | 179 view(s)
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7th November 2019, 17:37-Screws have to touch to the GND if they are mounted on Top GND layer..( preferable ) -If you will re-design the PCB, place numerous Top-to-Bottom...12 replies | 458 view(s)
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7th November 2019, 11:38There are many mistakes on your PCB layout. -You didn't use double sided PCB so Microstrip Lines have no sens at all.. -GND Connections are very...12 replies | 458 view(s)
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7th November 2019, 02:45This is C-Class Power Amplifier and it shouldn't draw any current unless the Input Power reaches to sufficient level. So, since there is no RF...12 replies | 458 view(s)
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6th November 2019, 23:38BigBoss replied to a thread Noise Figure budget analysis for power combiner & divider in Elementary Electronic QuestionsNF=Insertion Loss4 replies | 363 view(s)
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4th November 2019, 10:09BigBoss replied to a thread [Cadence ADE XL] Optimize a Common Source Amplifier to 15dB gain via Corner Analysis in Analog Circuit DesignYou cannot find Optimum Vdc(in) in such a way..Here, you're changing Vdc(in) and obviously Vout is changing.. Gain is another metric and...10 replies | 447 view(s)
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3rd November 2019, 15:12If a RF Structure has 2D or 2.5D, Momentum ( or equivalent ) is always faster and accurate.HFSS is a General Purpose real 3D FEM Simulator but it's...7 replies | 430 view(s)
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3rd November 2019, 15:05BigBoss replied to a thread Doubts regarding MMIC LNA design usingKeysight Technolo Advanced Design System (ADS) in RF, Microwave, Antennas and OpticsHowever the design techniques are quite different but Fundamentals are almost same. Here, in MMIC Passive Components are designed using with...4 replies | 277 view(s)
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2nd November 2019, 04:57This one is much more better for your 1.5GHz Reference. https://www.analog.com/en/products/adf4360-4.html8 replies | 492 view(s)
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1st November 2019, 23:14In order to create a stable and clean reference another PLL can be used.Because Reference Signal for PLLs is very important and they have to be...8 replies | 492 view(s)
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29th October 2019, 16:00BigBoss replied to a thread Can you plot loadpull contour plots from impedance values ? in RF, Microwave, Antennas and OpticsQuestion is not clear or I didn't understand..2 replies | 246 view(s)
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27th October 2019, 19:26BigBoss replied to a thread Difference in the reactive part between loadpull simulation and large signal sparams in RF, Microwave, Antennas and Opticsvivekroy, You confuse a thing.. Driving an amplifier naturally and finding internal source impedance ( The Impedance which is found by Load Pull...8 replies | 777 view(s)
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27th October 2019, 11:21BigBoss replied to a thread Deviation between simulation and measurement of matching circuits in RF, Microwave, Antennas and OpticsThe influence of SMA connector can be neglected @ 2.4GHz. It has an influence over 10GHz and beyond..9 replies | 697 view(s)
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26th October 2019, 20:59This circuit detects nothing but noise.. You do very serious fundamental mistakes12 replies | 628 view(s)
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