BigBoss
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Yesterday, 14:36BigBoss replied to a thread Why does my homemade Yagi wifi antenna perform so poorly? in RF, Microwave, Antennas and OpticsYou'd better to put a simple PCB just underneath the Dipole and assembly it with proper PCB type SMA Connector otherwise you cannot be sure about...17 replies | 502 view(s)
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17th August 2019, 16:53BigBoss replied to a thread Balun design gives box resonance error in Sonnet in Electromagnetic Design and SimulationYou're closing the Box with Perfect Conductor and 20mm Height is not enough.Make the Box Free Space Enclosure or increase the Air Height..12 replies | 355 view(s)
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17th August 2019, 06:48The solution comes into my mind is Darlington Transistor with Low Vce(sat) feature.. Am I wrong ?? Or using a simply a MOS ?? Zero bias current and...15 replies | 396 view(s)
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16th August 2019, 19:38-Ib has to be <4mA -Vce(sat) has to be >0.5V @ Ic=40mA.. I wonder what type of application is it ?? If you would Vce(sat)>0.5V, connect simply a...15 replies | 396 view(s)
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16th August 2019, 14:47This type of case and transistors are gone.. Even you find a complementary, it will not have exact specifications.. What is your project, I can make...1 replies | 108 view(s)
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16th August 2019, 05:10BigBoss replied to a thread Which transistor need to be chosen for designing KU-Band LNA Design high gain, low NF in RF, Microwave, Antennas and OpticsYou don't have too much choice.. http://www.cel.com/product.do?command=viewSelector&group=4#a35302 replies | 245 view(s)
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15th August 2019, 23:07BigBoss replied to a thread High power efficiency oscillator topologies? in RF, Microwave, Antennas and OpticsIt's normal because you touch most sensitive node of the oscillator.I suggest you to use Emitter Follower Buffer to isolate the load and oscillator...14 replies | 352 view(s)
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15th August 2019, 21:59BigBoss replied to a thread High power efficiency oscillator topologies? in RF, Microwave, Antennas and OpticsIf you have already found a D-Class Differential Low Power Oscillator as you wish, use only one output and make the second one grounded via a...14 replies | 352 view(s)
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15th August 2019, 21:08OK, if you are able to measure primary and secondary side of the transformer independently, you can use a "Lossy Transformer Model" that can be found...20 replies | 373 view(s)
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15th August 2019, 21:05They are just to connect a SMD component where the matching is proper.The designer may make a fine tuning to shift left and right the matching...4 replies | 170 view(s)
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15th August 2019, 21:01BigBoss replied to a thread High power efficiency oscillator topologies? in RF, Microwave, Antennas and OpticsWhat is the frequency and what is your target ??14 replies | 352 view(s)
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15th August 2019, 13:34I suggest you extract a accurate model of the Pulse Transformer ( it might be simple or complex) then use a simulator because calculating Voltages...20 replies | 373 view(s)
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15th August 2019, 13:30BigBoss replied to a thread Looking for a VHF/UHF 90 degrees Hybrid Coupler part in RF, Microwave, Antennas and Opticswww.werlatone.com They have wideband hybrids but I think they are expensive ..4 replies | 217 view(s)
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15th August 2019, 13:27BigBoss replied to a thread Problem about amplifier biasing circuit in RF, Microwave, Antennas and OpticsIn order to expand The Voltage Headroom.If we use a Resistor, we'll loose Voltage Headroom.. RFC can sometimes be a part of Matching Circuit...4 replies | 147 view(s)
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15th August 2019, 13:24No..It's a pattern to tune the Matching Circuit.4 replies | 170 view(s)
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15th August 2019, 13:21While calculating Voltages and Currents with Pulse Transformer, how did you model it ?? Because Ohm's Law cannot be applied to Transient Domain in...20 replies | 373 view(s)
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15th August 2019, 11:38BigBoss replied to a thread Problem about amplifier biasing circuit in RF, Microwave, Antennas and OpticsLd can be used either Matching Purpose or RFC.Depends on the Designer.. But if this LNA is a RFIC type Matching is not very necessary due to very...4 replies | 147 view(s)
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15th August 2019, 07:10BigBoss replied to a thread Looking for a VHF/UHF 90 degrees Hybrid Coupler part in RF, Microwave, Antennas and OpticsIt will probably exceed.Therefore I'm saying it's more difficult to find Low Frequency Passive Components rather than High Frequency ones. In fact...4 replies | 217 view(s)
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15th August 2019, 03:54You should drive the PA until the PA enters into SAT mode in order to observe the Efficiency in Main and Aux. Amplifier regions. Back-Off effect in...5 replies | 294 view(s)
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14th August 2019, 21:28BigBoss replied to a thread Looking for a VHF/UHF 90 degrees Hybrid Coupler part in RF, Microwave, Antennas and OpticsThe Bandwidth is more than 2 Octaves at Low Frequencies, it's pretty difficult to find it within specifications. It's easy to find a Hybrid Coupler...4 replies | 217 view(s)
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14th August 2019, 13:22Output Power should be vicinity of P1dB. In fact, there isn't any convention about that because some manufacturers use P3dB some of them P1dB....5 replies | 294 view(s)
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13th August 2019, 09:55BigBoss replied to a thread design and simulation of cross-coupled VCO using keysight ADS in RF, Microwave, Antennas and OpticsSmall signal Models are NOT used neither in Transient nor HB analysis. You have to read "fundamentals of simulation techniques" from different...9 replies | 487 view(s)
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13th August 2019, 02:47BigBoss replied to a thread How to increase high frequency output power in RF, Microwave, Antennas and OpticsIt depends on many variables.It's not easy to say.. Output Power may be function of Power Gain, Load,Transistor (Amplifier/Active Device )...5 replies | 219 view(s)
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12th August 2019, 11:59BigBoss replied to a thread problem: coupling coefficient for two hairpin resonators in RF, Microwave, Antennas and OpticsI think the results of that textbook in fig 8.16 are theoretical or analytical not EM simulated.Otherwise the peaks cannot be so sharp in practical...9 replies | 367 view(s)
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12th August 2019, 06:34The MOS Input Capacitance 8nF (max)!! It's really huge if the PWM frequency is relatively high.It will need a "strong" Driver for it.6 replies | 230 view(s)
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12th August 2019, 06:20BigBoss replied to a thread problem: coupling coefficient for two hairpin resonators in RF, Microwave, Antennas and OpticsI have simulated that resonator in AXIEM and found that the resonator coupling gap has reverse effect compare to standard ones.9 replies | 367 view(s)
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11th August 2019, 18:32It's not necessary this circuit.If the Fanout Capacity of the PWM Source sufficient, you can directly drive the MOS if the signal swings between...6 replies | 230 view(s)
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11th August 2019, 18:29Q=R*SQRT(C/L) so L value must be as low as possible,C must be as high as possible to obtain highest Q for Parallel Resonance Circuit. The conductor...2 replies | 177 view(s)
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10th August 2019, 05:20BigBoss replied to a thread How can I obtain selectivity plot of frequency divider? in Analog Circuit DesignYou can simulate such divider by varying the input amplitude @ each frequency so you can observe the output amplitude in HB analysis. When the...3 replies | 251 view(s)
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9th August 2019, 21:37Output of a Prescaler is square wave due to its nature.. There were prescalers in the market form Siemens, Plessey,Motorola,Telefunken 20+ years ago...2 replies | 162 view(s)
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