BigBoss
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Yesterday, 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..8 replies | 231 view(s)
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Yesterday, 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...10 replies | 253 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...10 replies | 253 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 | 100 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 | 174 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 | 312 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 | 312 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...11 replies | 245 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 | 153 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 | 312 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...11 replies | 245 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 | 197 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 | 132 view(s)
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15th August 2019, 13:24No..It's a pattern to tune the Matching Circuit.4 replies | 153 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...11 replies | 245 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 | 132 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 | 197 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 | 274 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 | 197 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 | 274 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 | 470 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 | 201 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 | 349 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 | 221 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 | 349 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 | 221 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 | 166 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 | 242 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 | 153 view(s)
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8th August 2019, 19:08BigBoss replied to a thread When simulating center tapped inductor in ADS in Software Problems, Hints and ReviewsIf we consider the equivalent circuit of an inductor and when we make short circuit P2, corresponding distributed components are becoming short...13 replies | 350 view(s)
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