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  1. A

    Reason of leakage current in HEMT devices

    Hi, We are using CFY67-08 ( infenion make-HEMT ) for our LNA design, for biasing purpose we are using a sequential bias card, initially devices have been tested separately in a jig and it is observed that at Vds=2V we are drawing a drain current of 10 mA, with a leakage current (gate leakage...
  2. A

    S-parameters for bfy-405 transistor

    I am planning for a nonlinear model of BJT ( BFY-405), can any body send me s-parameter file of this transistor in the following regions: 1. Linear region. 2. Pinch off region. 3. Saturation region. Waiting for a rply. Thanks.
  3. A

    Linear phase filters and their bandwidth .....

    If say three tones say 2KHz, 5Khz and 30 KHz are allowed to pass through a linear filter so that the group delay for all the three tones should be equal what will the bandwidth ??? Plz do guide me.
  4. A

    Average probability of bit error and input level required for discriminator

    I will go thru the Feher, also plz do help me to grab how the linear phase filters work ???
  5. A

    Average probability of bit error and input level required for discriminator

    Can any body guide me the difference between average probability of bit error for FSK system and for PSK system ??? Why one (FSK) follows Rician probability function and other follows Gaussian density function, concept wise can any body explain this, Plz do guide me. More over what is the...
  6. A

    Power gain circles used in high frequency amplifier design and and its difference

    Hi, How the constant gain circles used in LNA design are different from operating power gain circles!!! Regards
  7. A

    Distributed amplifiers design

    HI all, I have read in so many articles the design of distributed amplifiers that they are the attractive choice for MMIC design, can we use distributed technology in microstrip design using packaged devices at high frequency say -at ku-band ??? If not what are the drawbacks?? - - - Updated -...
  8. A

    Non-Linear HEMT model

    Dear afzal sir, That i know that noise matching is gamma s=gamma opt and it is provide by manufacturer, i just want to know how the noise behavior will change if it is conjugately matched??? and why noise figure will be poor?
  9. A

    Non-Linear HEMT model

    i think concept of gamma-opt in noise matching is that generator impedance should match with the device impedance so that noise power should not reflected back and it should not be correlated. sir what i think if the device impedance is matched with the load and source impedance say ~50 ohm...
  10. A

    Non-Linear HEMT model

    a.What is the difference in the topology of minimum noise matching and power gain matching/conjugate matching ? b. For an amplifier to drive the succeeding stages (driver amplifier), we require at least 5.0dBm output power from the amplifier,( currently we are using CFY25,as a device for design...
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    Non-Linear HEMT model

    What is the role of Dgd ( diode at gate and drain ) in large signal model ? Since in HEMT/MESFET the equivalent lumped circuit model shows two diodes , one at gate-source side and another at drain-source side!,since both are diodes how the device amplification takes place.... 1. S-parameter...
  12. A

    Mixing of a two signalsl in mixer

    Since in mixer we multiplying two signals (periodic) in time domain, is this a convolution in frequency domain? How we can explain it ? Plz do guide me.
  13. A

    Trl over solt calibration

    Hi MAZZ, Thanks for the application note. Since THRU determines the reference plane, What is the role of LINE standards in TRL calibration ?and why in the application notes it is lambda/4 relative to THRU standard? ? Kindly guide me
  14. A


    since THRU defines reference planes, what is the role of LINE standards in TRL calibration?
  15. A

    Sensitivity of spectrum analyzer

    How can we define the sensitivity of a spectrum analyzer ? is it same as that of normal receiver and can anybody write the equation.
  16. A

    Trl over solt calibration

    what is the difference between de-embedding and in-fixture calibration ?Usable bandwidth of a single line is 8:1,actually what it means ? suppose we want our calibration kit to work for the frequency range of 2-15GHz, how many lines we have to introduce ?? Plz guide.
  17. A

    Trl over solt calibration

    What is the advantage of TRL calibration over SOLT calibration
  18. A

    doppler effecest in modulation technique

    In satellite receiver/transponder doppler is a major concern, due to relative velocity between earth and satellite, now my query is what kind of modulation is preferred ? FM or PM ?
  19. A

    multi tone modulation using FM techniques

    How to find modulation index for a multi tone FM signal ? Let us take our real case: we have 8 KHz sub carrier ( use to modulate PSK data), apart from that we have 27.777KHz and 8Hz as tone signals , Is it possible to modulate all these tones using a single carrier? How the spectrum will look ...
  20. A

    High frequency design challenges

    Kindly help me to give a suitable answer. How the discontinuities are severe in high frequency design?????????????

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