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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...
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    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.
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    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.
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    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...
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    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
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    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 -...
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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...
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    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.
  9. A

    LINE and THRU CALIBRATION STANDARDS for TRL calibration

    since THRU defines reference planes, what is the role of LINE standards in TRL calibration?
  10. 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.
  11. A

    Trl over solt calibration

    What is the advantage of TRL calibration over SOLT calibration
  12. 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 ?
  13. 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 ...
  14. A

    High frequency design challenges

    Hi, Already in so many threads discontinuity have been discussed, now i have to design two driver amplifier circuits operating at 14 GHz and 17 GHz respectively. I am using a nonlinear model that will work upto 20 GHz, since 17 GHz is higher than 14 GHz, what are the typical problem i will face...
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    Limiter circuit before FM demodulator

    Hi, Can a differential amplifier can be used as a limiter circuit for FM demodulation ? Can anybody explain the circuit, if it exixt !! Thanks
  16. A

    Noise power linearity

    WHY IT IS A MANDATORY THAT LINEARITY IS REQUIRED FOR NOISE MEASUREMENT !! If the system is not linear then the measurement of noise is not possible??? Plz do advice me.
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    Variation in the sensitivity of the receiver with interfacing

    Hi, This is to bring to notice that we have observed a variation in the threshold of the receiver if the interfacing is not proper, my observation is as follows: 1. In our receiver, the RF is 14.5GHz, first down conversion is at 595 MHz so LO1 is 13.9GHz, the scheme of LO1 is a fractional PLL...
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    Comparison of Microstrip with CPW for implementation in ku-band region

    Hi guys, We have implemented circuits operating at KU-band in 10 mil alumina substrate ( microstrip based ), all the active circuits used packaged devices, instead of die can we use CPW instead of microstrip ???, Why generally MMIC techniques used CPW INSTEAD OF MICROSTRIP ?? Can we say CPW...
  19. A

    Discontinuity effect In Rf package design !!!

    Hi all, One of my observation while integrating the RF circuits in a package as stated below: All the Rf circuits are fabricated in 10 mil alumina substrate hence the pattern width is ~ 0.25 mm and in few places we have used Isolators having pin width ~0.6mm ( 25 mil approx)( due to non...
  20. A

    kind of crystal used in PLL ---- overtone or fundamental !!!

    Hi guys, In PLL based synthesizers what kind of crystal generally we should use !!!--- fundamental or overtone ?? Which one is better for Phase noise term! Generally i have seen 10 MHz or 20 MHz crystals people are using can i use 88MHz overtone crystal in place of them?? what will be the...

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