BigBoss
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Today, 14:07Ports are not excited simultaneously by definition of s-parameters.The simulator does not do too.. If this structure is a "Planar Wilkinson Power...4 replies | 129 view(s)
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Today, 05:59Combiners/Dividers are passive elements so they have losses, not gain.. How did you simulate his combiner?? Which EM simulator have you used ?? What...4 replies | 129 view(s)
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15th September 2019, 22:08This is not a Balun, it's a transformer with tapped pins.It can be used as a Balun of course but tapped pins are not necessary if you don't drive an...3 replies | 223 view(s)
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15th September 2019, 18:23But they are physically connected, you wanna separate the nets ?? I don't think so that is possible..3 replies | 223 view(s)
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15th September 2019, 18:20BigBoss replied to a thread Is there possibility to force a filter topology in DA_LClowpassMatch in ADS? in RF, Microwave, Antennas and OpticsYou cannot match over this bandwidth with simple few matching circuit.Load Impedance is not constant and varies by frequency.. Is your intention to...24 replies | 698 view(s)
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14th September 2019, 19:12BigBoss replied to a thread How can i design defected ground structure in AWR ? in Electromagnetic Design and SimulationArrange the layers and associated materials and other stuffs in "Enclosure" box and make the "Bottom Boundry" being as Open. Then connect the Ports...3 replies | 255 view(s)
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13th September 2019, 16:17BigBoss replied to a thread Is there possibility to force a filter topology in DA_LClowpassMatch in ADS? in RF, Microwave, Antennas and OpticsAppend to volker.. Choose the Filter's Input Output Real Impedances carefully regarding to those impedances to be matched. Choose appropriate...24 replies | 698 view(s)
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11th September 2019, 19:34BigBoss replied to a thread 1dB compression point and jamming signals in RF, Microwave, Antennas and OpticsJamming sensitivity is not depended on P1dB Compression Point only ..Non-linearity ( in general speaking ) is figure of merit of an LNA but "the...3 replies | 301 view(s)
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11th September 2019, 19:28BigBoss replied to a thread Is there possibility to force a filter topology in DA_LClowpassMatch in ADS? in RF, Microwave, Antennas and OpticsThere is no such definition as Matching Frequency in Filters.. Because Filters are not matching circuits. OK, If Input and Output Impedances are...24 replies | 698 view(s)
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11th September 2019, 05:07BigBoss replied to a thread (ADS) There are no components in ADS after importing my PCB layout from Altium in Software Problems, Hints and ReviewsODBC++ is not a proper way-especially from Altium- to import into ADS.Use simply Gerber format.. no pain..4 replies | 191 view(s)
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8th September 2019, 20:13I believe that the frequency is too low to couple two layers that are layed down on two different layers.So efficiency of a such transformer will be...6 replies | 310 view(s)
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8th September 2019, 19:57BigBoss replied to a thread Questions about the definition of Z-matrix and Zin and Zout in Software Problems, Hints and ReviewsYou confuse z-parameters and Input/Output Impedances of a 2-port. z-parameters are "open circuit parameters" and z11 is not equal to Zin ( or z22 is...1 replies | 401 view(s)
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7th September 2019, 10:04So you should check the Load is connected well then you will turn on the PA, is that right ?? If it's so, I would use a switch to check the Load is...4 replies | 251 view(s)
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6th September 2019, 17:37But if the load is disconnected the PA will also be burned due to reflected waves from Open Circuit.. Take this account into..( I presume the PA has...4 replies | 251 view(s)
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6th September 2019, 17:28BigBoss replied to a thread Parameters S12 Reverse transmission coefficient in RF, Microwave, Antennas and OpticsImagine an amplifier..It has one input and one output port right ?? If you apply a signal to input port, you achieve amplified signal at the output....6 replies | 358 view(s)
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6th September 2019, 17:23BigBoss replied to a thread Is there possibility to force a filter topology in DA_LClowpassMatch in ADS? in RF, Microwave, Antennas and OpticsFilters have only cut-off frequency definition,that's it..The Input/Output Impedances are constant( already defined ) along filter specification...24 replies | 698 view(s)
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6th September 2019, 17:20Parallel resistors are used at input/output or both..Consider also highpass/lowpass filter combination. There are numerous solution for the...3 replies | 205 view(s)
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6th September 2019, 10:19The amplifier may oscillate-not definitely but-.If K<1, the amplifier is conditionally stable so certain load and source impedances may drift it into...3 replies | 205 view(s)
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6th September 2019, 00:07BigBoss replied to a thread Spacing Between PCB Pad and HEATSINK in PCB Routing Schematic Layout software and SimulationIn order to prevent from electrical arcs , I'd recommend yo to use a adhesive insulator between heat-sink and capacitor pads.3 replies | 379 view(s)
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6th September 2019, 00:03BigBoss replied to a thread Parameters S12 Reverse transmission coefficient in RF, Microwave, Antennas and Optics"Quadripole" means 2-Ports right ?? So, since the antenna has one port only, there won't be S12 or S21 etc.It will have S11 only and the quality of...6 replies | 358 view(s)
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5th September 2019, 18:45BigBoss replied to a thread Is there possibility to force a filter topology in DA_LClowpassMatch in ADS? in RF, Microwave, Antennas and OpticsADS Filter Design Guide does not accept complex load or source impedances. Therefore you should use a closer real impedance-for instance 10 Ohm-then...24 replies | 698 view(s)
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5th September 2019, 18:25BigBoss replied to a thread Parameters S12 Reverse transmission coefficient in RF, Microwave, Antennas and OpticsS12 has no dependency on antenna or other RF devices.S-parameters are definitions that relate interrelation of the Ports of a system either antenna...6 replies | 358 view(s)
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1st September 2019, 17:27BigBoss replied to a thread How to realize inductor from transmission line (micro-strip and CPW lines) in RF, Microwave, Antennas and OpticsCPW cannot be used for Inductor Realizations.Especially if the frequency is not sufficiently high, making an inductor by using Transmission Lines is...5 replies | 385 view(s)
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31st August 2019, 23:50BigBoss replied to a thread How do you choose input power while doing loadpull? in RF, Microwave, Antennas and OpticsYes, you should apply P1dB(in) to do load-pull..Because this point where the nonlinearity starts to become dominant on the amplifier's performance so...5 replies | 471 view(s)
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30th August 2019, 00:31BigBoss replied to a thread Input and output matching for LNA design in ADS in RF, Microwave, Antennas and OpticsYou should check the Optimum Reflection Coefficient for Lowest Noise target then you can add Ls and Lg to bring up this impedance matched to 50 Ohm....3 replies | 269 view(s)
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29th August 2019, 15:56BigBoss replied to a thread Input and output matching for LNA design in ADS in RF, Microwave, Antennas and OpticsIf you don't know exactly what values they have, use optimization technique to achieve your requirements. I don't know what frequency you're working...3 replies | 269 view(s)
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29th August 2019, 15:52For DC blocks, use a high valued capacitor- for instance- 1mF, for DC feeds use high valued inductor-for instance- 1mH2 replies | 249 view(s)
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28th August 2019, 15:11BigBoss replied to a thread ADS (advanced design system) install in Electromagnetic Design and SimulationIf you're student, request license from Keysight.. ADS is downloadable from Keysight's website but you have to get a valid license.Keysight offers...3 replies | 352 view(s)
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28th August 2019, 02:18BigBoss replied to a thread How to get S2P files for Avago Technologies ATF54143 Transistor in RF, Microwave, Antennas and OpticsThere is ADS model file here.. https://docs.broadcom.com/docs/MPUB-15113 replies | 272 view(s)
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27th August 2019, 21:38BigBoss replied to a thread Noise effects in a power source in ADS in Electromagnetic Design and SimulationDear bilal.habib, Since your circuit has no information about noise which is created in it, you cannot achieve any meaningful result.In order to...6 replies | 534 view(s)
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