BigBoss
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Today, 02:01BigBoss replied to a thread Bidirectional HF amplifier question in RF, Microwave, Antennas and OpticsThis amplifier will probably oscillate.. Watch out.. The better case is to use either 2 RF switches ( TX/RX) or use 2 amplifiers connected as shown...3 replies | 141 view(s)
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14th November 2018, 20:11I think you make a mistake. Regarding to "Analysis and Design of Analog Integrated Circuits" of Meyer-Gray page-74,the Partial derivative of Id...3 replies | 130 view(s)
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14th November 2018, 17:39BigBoss replied to a thread 4 Layer stackup filter response help needed in Electromagnetic Design and SimulationP1 and P2 have a GND reference but that GND does not exist just underneath of the Ports.In this case, where the ports' currents will return back ??...4 replies | 211 view(s)
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13th November 2018, 22:50Almost every texbook mentions about linear reagion of MOS transistors, why couldn't you find it ??3 replies | 130 view(s)
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13th November 2018, 17:17BigBoss replied to a thread 4 Layer stackup filter response help needed in Electromagnetic Design and SimulationHow did you configure the Portsin according within new layout ??4 replies | 211 view(s)
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13th November 2018, 17:15BigBoss replied to a thread Is this correct design of RF trace ? in RF, Microwave, Antennas and OpticsIn fact, there is not so much Microstrip structure on that PCB.So, it should be ok.. But if the frequency is high enough, changing the Microstrip...2 replies | 167 view(s)
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11th November 2018, 05:05This diode has been obsoleted in 2007 !!1 replies | 199 view(s)
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10th November 2018, 18:04A Differenatial Pair has pretty high Output Impedance therefore it cannot drive a large capacitive/inductor loads. That's why there is an Output...5 replies | 278 view(s)
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9th November 2018, 04:59Check .cdsinit file under your working directory because if there is a .cdsinit file , it will have highest priority other than ~/.cdsinit or...13 replies | 877 view(s)
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8th November 2018, 14:02BigBoss replied to a thread [SOLVED] Cadence Spectre cannot read library model files in Software Problems, Hints and ReviewsThe file format could be broken due to editor. Because some text editors may add some extra hidden characters into file and Cadence Spectre sees...3 replies | 341 view(s)
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8th November 2018, 13:58BigBoss replied to a thread how do transform the inductor (passive element) into transistor (CMOS) based in Elementary Electronic QuestionsWhat does it mean "transistor form " ?? Did you mean "Active Filter" ?? I don't think that this filter who works at 3.8GHz can be realized as Active...4 replies | 200 view(s)
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6th November 2018, 15:25BigBoss replied to a thread how do transform the inductor (passive element) into transistor (CMOS) based in Elementary Electronic QuestionsThis filter cannot be transformed onto CMOS equivalent, it's too complicated.( it has many drawbacks in term of layout and you can almost never...4 replies | 200 view(s)
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6th November 2018, 15:16Application of this antenna has been well illustrated here.. https://www.mouser.com.tr/datasheet/2/611/0915AT43A0026-242364.pdf18 replies | 522 view(s)
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6th November 2018, 13:44The occupied area is just roughly 10mmx20mm, so it's not critical thought.18 replies | 522 view(s)
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5th November 2018, 22:53If I were you ,I would use a simple and cheap 915 MHz di-electric SMD antenna.They don't occupy too much space.....18 replies | 522 view(s)
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5th November 2018, 22:51Strong Radio Channels don't impact directly the IF Frequency only, they do impact also LNA so interference signal(s) may cause Harmonic Distortion...6 replies | 224 view(s)
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4th November 2018, 02:27-Balun is not symmetrical and unusual ( i don't know how it works and what the Phase Relationships are maintained ) -Single Ended simulation set-up...5 replies | 325 view(s)
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3rd November 2018, 18:33BigBoss replied to a thread How to match ceramic resonator to 50R? in RF, Microwave, Antennas and OpticsYou confuses Ceramic Resonators for Oscillators and Ceramic Filters....10 replies | 363 view(s)
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1st November 2018, 21:16BigBoss replied to a thread How to define a port in cadence which has an impedance value that is frequency dependent in Analog Circuit DesignUnfortunately "freq" variable cannot be used in Spectre s-parameters simulations.However it's possible to use in ADS.2 replies | 303 view(s)
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31st October 2018, 16:21BigBoss replied to a thread EM model Harmonic balance simulation in RF, Microwave, Antennas and OpticsThe loss maybe higher than expected or there may be a mismatch between filter and the circuit. Have you ever checked the practical filter with its...3 replies | 138 view(s)
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30th October 2018, 17:45BigBoss replied to a thread Doubly balanced Gilbert Cell Mixer in Analog Integrated Circuit (IC) Design, Layout and FabricationYou're doing a mistake by using resistors as load.You loose 0.5V over those resistors and therefore chopping FETs are working in linear region.In...5 replies | 233 view(s)
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30th October 2018, 17:36BigBoss replied to a thread BJT transistor mextram model accuracy in RF, Microwave, Antennas and Optics-Your layout does not cover Emitter GND connection VIAS.This is important because these vias might be a part of matching. -C5 and C6 ( decoupling...9 replies | 288 view(s)
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30th October 2018, 16:56BigBoss replied to a thread BJT transistor mextram model accuracy in RF, Microwave, Antennas and OpticsHave you ever simulated your PCB layout(Momentum)+Circuit Schematic in ADS ?? Plus, your layout is not same as NXP's in App. Notes.If your operating...9 replies | 288 view(s)
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30th October 2018, 12:44BigBoss replied to a thread BJT transistor mextram model accuracy in RF, Microwave, Antennas and OpticsMextram model is a very accurate BJT model.There might be some other additional effects..9 replies | 288 view(s)
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29th October 2018, 17:51BigBoss replied to a thread How to extract S-parameters without EM field solvers? in RF, Microwave, Antennas and OpticsTo my understanding you and your company design High Speed PCB Boards for your customers, right ?? If it's so, you don't need a real 3D EM simulator...11 replies | 461 view(s)
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27th October 2018, 12:01BigBoss replied to a thread Cadence Allegro vs. OrCad in PCB Routing Schematic Layout software and SimulationYes, the interfaces are very similar.5 replies | 672 view(s)
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25th October 2018, 14:06BigBoss replied to a thread Monte carlo simulation in cadence virtuoso 6.1.4 ADE in Software Problems, Hints and ReviewsYou're doing a Transient Simulation, so you cannot obtain a scalar output.Transient simulation will give you wavetype output and this cannot be used...7 replies | 554 view(s)
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24th October 2018, 15:30BigBoss replied to a thread ADS EM model problem s-parameter simulation in RF, Microwave, Antennas and OpticsYour set-up and simulation method both are essentially wrong.You connected both layout and electrical component to the same PIN. What you would...18 replies | 634 view(s)
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24th October 2018, 13:57BigBoss replied to a thread ADS EM model problem s-parameter simulation in RF, Microwave, Antennas and OpticsWhat type of structure you intend to simulate?? Can you post a picture here ??18 replies | 634 view(s)
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24th October 2018, 13:55BigBoss replied to a thread Monte carlo simulation in cadence virtuoso 6.1.4 ADE in Software Problems, Hints and ReviewsYou have to define an "Output" in ADE Output tab.It might be a voltage or current or anything else scalar7 replies | 554 view(s)
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