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  1. Replies
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    Closed: Re: Noise effects in a power source in ADS

    Since you use s6p Touchstone s-parameters file and they have no information about Noise of 6-port device, it doesn't make sense to add a Noise to Power Source..
    You confuse essentially small signal...
  2. Closed: Re: Balun design gives box resonance error in Sonnet

    Volker,

    Controlled Impedance Analyzer and Transmission Line Tool give different results for Edge-to Edge Coupled Lines for the same Input data, do you know why ??
  3. Closed: Re: How to measure differential signals using an Oscilloscope

    This method is a bit subjective and unstable.If the frequency is sufficiently high, phase shifts will be different by oscilloscope channels so the measurement may be a bit erroneous.
    You presume...
  4. Closed: Re: How to include RF Transistor Vendor Kit in Advanced Designed Design(ADS)

    Some Design Kits and Libraries are not installed by default.They are zipped under :
    C:\Program Files\Keysight\<ADS_Version>\oalibs\componentLib
    Unzip ( or use ADS to unzip) somewhere and install...
  5. Closed: Re: Balun design gives box resonance error in Sonnet

    I have drawn the layout precisely in AutoCad as mentioned in the paper and there are some dimension errors.I couldn't catch the electrical response in AWR Axiem and Sonnet..
  6. Closed: Re: Why does my homemade Yagi wifi antenna perform so poorly?

    You'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 antenna performance..
  7. Closed: Re: Balun design gives box resonance error in Sonnet

    You're closing the Box with Perfect Conductor and 20mm Height is not enough.Make the Box Free Space Enclosure or increase the Air Height..
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    Closed: Re: BJT V(ce) ON in common emitter mode

    The 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 very low sat voltage ..
    I'm still not sure what...
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    Closed: Re: BJT V(ce) ON in common emitter mode

    -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 resistor ??
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    Closed: Re: bfq162 pnp comlementary?

    This 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 an alternative offer
  11. Closed: Re: Which transistor need to be chosen for designing KU-Band LNA Design high gain, lo

    You don't have too much choice..
    http://www.cel.com/product.do?command=viewSelector&group=4#a3530
  12. Closed: Re: High power efficiency oscillator topologies?

    It'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 because even if you use high impedance node as a...
  13. Closed: Re: High power efficiency oscillator topologies?

    If 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 capacitor.
    Since the oscillator will not be loaded by a...
  14. Closed: Re: Pulse transformer output measured vs. calculated?

    OK, 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 in the literature and use it in LTSpice...
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    Closed: Re: Metal patterns in PCBs

    They 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 component.
    There are also stub optional pads around...
  16. Closed: Re: High power efficiency oscillator topologies?

    What is the frequency and what is your target ??
  17. Closed: Re: Pulse transformer output measured vs. calculated?

    I suggest you extract a accurate model of the Pulse Transformer ( it might be simple or complex) then use a simulator because calculating Voltages and Currents of such a circuit will be very...
  18. Closed: Re: Looking for a VHF/UHF 90 degrees Hybrid Coupler part

    www.werlatone.com

    They have wideband hybrids but I think they are expensive ..
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    Closed: Re: Problem about amplifier biasing circuit

    In 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 moreover even Bonding Wires are also be used for Matching...
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    Closed: Re: Metal patterns in PCBs

    No..It's a pattern to tune the Matching Circuit.
  21. Closed: Re: Pulse transformer output measured vs. calculated?

    While calculating Voltages and Currents with Pulse Transformer, how did you model it ?? Because Ohm's Law cannot be applied to Transient Domain in which is your case.
    I mean, you cannot find...
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    Closed: Re: Problem about amplifier biasing circuit

    Ld 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 short distances in RFIC, Ld in this case might be RF...
  23. Closed: Re: Looking for a VHF/UHF 90 degrees Hybrid Coupler part

    It will probably exceed.Therefore I'm saying it's more difficult to find Low Frequency Passive Components rather than High Frequency ones.
    In fact the Bandwidth can be extended by using...
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    Closed: Re: Power Amplifier Design

    You 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 Efficiency can be observed with this method ..
  25. Closed: Re: Looking for a VHF/UHF 90 degrees Hybrid Coupler part

    The 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 at High Frequencies with a bandwidth more than 2...
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