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Recent content by govardhanamma

  1. G

    n channel mosfet switch

    we have connected the circuit as given in the image but we have connected drain to the ground and source to supply i,e -5v, trough a resistor of 1.5k,and if VGS is 0 it is showing -3.3v across resistor after raising the gate voltage the voltage at the source is decreasing,but my doubt is with...
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    n channel mosfet switch

    hi, i want use irf 630 n-channel mosfet by grounding the drain voltage and by applyin -5v to the source resistor,and by gradualliy increasing the gate voltage from 0v to saturation of mosfet ,will this circuit will work ,my aim is to achieve -5v across resistor during off condition of mosfet...
  3. G

    power supply design for rf power amplifier

    please help me how to design for my rf 100w power amplifier it needs 28vfor rain and 3.1v for gate another two , 28v for its drivers,and two2.8v for their gate how can i design all these ps connections in one pcb and what is the ckt to be used
  4. G

    Substrate Selection for power Divider design at 10 GHz

    u can use ro6035htc laminate it can be used at high frequency and also for high power combinations,or u can also confirm by using rogers substrate selection software u can freely download in rogers site.
  5. G

    Combine 3 PA's together

    you can find different power combiners more than 500w in meca, rf lamba.com
  6. G

    Pcb trace width for 10a current

    HELLO, WE WRE DESIGNING A POWER AMPLIFIER IT DRAWS 10A CURRENT, HOW TO CALCULATES IT 2 LAYER PCB TRACK WIDTH FOR GIVING DC SUPPLy?????
  7. G

    Failure analysis of gan hemt

    source is grounded
  8. G

    Failure analysis of gan hemt

    yes base is grounded ---------- Post added at 01:15 ---------- Previous post was at 01:09 ---------- thanks for ur advice, my device consists of two mosfets in pushpull configuration in flange package,i have to check after removing the device from board ah????????????
  9. G

    Failure analysis of gan hemt

    Please help, we have tested a 100w gan hemt by applying only gate voltage less than pinch off voltage with out drain voltage, its base is grounded, by giving -5v to gate of pa gate voltage immediatly dropped and it showed some gate current and we have checked continuity of the pcb in...
  10. G

    test jig design for power amplifier

    please help how to design test jig for power amplifier my requirement is to give 28v for 4 pa's connected in series and -5v to its gate,how can i provide the same 28v supply to all the driver stages of power amplifier,i will take power supply of higher amps but how to design a test jig so, that...
  11. G

    substrates choosing for high power combiner

    please help me how to high frequency substrate for high power combiner,power handling of substrate should be more than 100w
  12. G

    designing of couplers,power dividers

    hello, can u please suggest what is the software to design power dividers and combiners ---------- Post added at 05:49 ---------- Previous post was at 05:46 ---------- hello, can u please suggest what is the free download software for EM SIMULATION????????????????????????????
  13. G

    [MOVED]Testing of fan transistor

    precautions while TESTING a GAN TRANSISTOR What are precautions to be taken while testing a high power gan transistor????????????????
  14. G

    [MOVED]Testing of fan transistor

    If we maesure gan transistor continuity with multimeter , is there is a chance of short circuit in the drain or gate? Please any one explain the concept.............................
  15. G

    design of pcb antenna

    thanks for ur reply,transmitted power is 10 dBm,freuency is 315MHz&434MHz,same antenna is not used used for tx&rx
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