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  1. X

    mixer followed by diplex filter

    What benifits does that will get? I'm confused about it! I wonder if you can give me some suggestions obout it,TKS!
  2. X

    The chip wll be damaged in this operating condition?

    Thank you very much for your kindness! I want to conduct the experiment of run-out.But it's really complicated. I'm now search for a method of your next suggestion.I just wonder how to handle that question when designing those instruments such as spectrum analyzer and network analyzer in which I...
  3. X

    The chip wll be damaged in this operating condition?

    I have contact WJ technology support, and they can't give my any clear answer,either.I think I should insert a limiter at the front of the chip,but it's hard to seek a low power limiter diode as to -10~0dBm power with a requestion of broadband frequency.
  4. X

    The chip wll be damaged in this operating condition?

    Hi,all! I use WJ amplifier SCG002.The main parameters of this chip are (1、absolute maximum RF input power(continuous):+12dBm.2、Absolute maximum junction temperature:+250 degree.3、Package:SOT89.4、DC supply:3.9V/45mA. 5、operating case temperature:-40 to +85 degree.6、thermal resistance:about...
  5. X

    How about this PCB,TKS!

    I'm sorry! It's in Protel 99se format! I will soon upload some pictures of the circuit ! The signal propagation path: RF --- RF fILTER --- MIXER --- IF AMP --- IF VGA top layer: red (for RF signal) layer 2 :grown(for a complete ground plane) layer 3 :green(for a VCC plane with two patches...
  6. X

    How about this PCB,TKS!

    Hi all: It's the first RF PCB in my life.I don't know how it will work.Maybe very badly.I would if you can give me some comments on the board,to tell me where it's good and where bad.TKS! About the board:(see the attachment of the next reply) It's a receiver circuit.While working,it will receive...
  7. X

    Why filter can't cascade in series?

    Re: Why filter can't cascade is series? Thank you for your kindness! The length of the coax actually influence the peak frequency.The shorter length coax get a closer peak to the passband of the filter.I saw the order is:If the length is shorter,the extra peak will be more closer to the...
  8. X

    Why filter can't cascade in series?

    cascade saw filter -80db Today,I connected two filters by coaxial lines of 50 ohm in series to get a better performance of the filters.But on the net analyser's screen,I saw several unexpected peaks of S12 beside the center frequency.I simulated this case by Ansoft Designer,I found the...
  9. X

    How to calculate PIN diode's power capacity?

    calculate diode rated power I'm sorry for wasting your time. I will be grateful if you help me.But if you are busy,I really don't want to occupy your time.
  10. X

    How to calculate PIN diode's power capacity?

    power dissipated by a diode calculation I'm sorry。I don't know how to post a picture on this forum. It's a tunable filter with a fixed cavity in which there is a pole.Our branches are all connected to the end of the pole.Each branched offer a selected or unselected load capacitance.They make...
  11. X

    How to calculate PIN diode's power capacity?

    power diode calculations I got the data of 80mA by measuring the voltage between the bias resistance's ends.I can get the performance of forward bias current and series resistance from the chart of "SERIES RESISTANCE AT 100 MHz vs FORWARD CURRENT (MA4P7000, MA4P7100 SERIES)" on it's official...
  12. X

    How to calculate PIN diode's power capacity?

    how to ensure the diode is in good condition First of all,Thank you very much! Almost all of your assumptions are ture.They are very reasonable. I have checked my PCB board carefully.The minimum gap of two components is about 0.8mm!I think they will not produce arc with a constant 40V...
  13. X

    How to calculate PIN diode's power capacity?

    power dissipation pin diode I made a metal cover under the PCB board.The cover was connected with the Ground plane by about 12 pins on different directions.Is that enough ??? Added after 10 minutes: On the PDF document of the PIN diodes,It doesn't say anything about the highest...
  14. X

    How to calculate PIN diode's power capacity?

    pin diode power I designed a RF ciucuit in which there were some PIN diodes to decide a operating RF path.The RF signal will pass by a PIN diode when it's path was choiced.It worked well under a -10dbm signal power generator.But when I added up the RF signal power to 20Watts,the performance of...
  15. X

    problem about PIN diodes

    Hi,all! Merry Christmas! I now have troubles in designing a hopping filter.It was made of a fixed combline cavity and a capacitors matrix which fixed at the end of the bar.Each branch of the matrix will decide an available center frequency of the filter.Each branch is mainly made of a PIN diode...
  16. X

    some questions about cavity filter!

    hi! I wanted to design a cavity filter.I had drafted the 3D model.(you can see the attachment of the post).First,I needed only design a fixed frequency filter.but later,my boss told me I must think more for redesigning it as a tunable filter.I planed to use a cavity and set a tunable...
  17. X

    what structure to develop a low IL chip filter!

    for example: the size of 2mm×1.2mm×1mm with a IL of 0.6dB,the material is LTCC,the εr is about 20.
  18. X

    what structure to develop a low IL chip filter!

    I find the spec of chip filter in big company is very rigorous.But I find chip filter on IEEE paper is usually poor.For example,by LTCC technology,on IEEE paper, the insertion loss is usually up to about 3 db,but by some companys' introduction,the value of their productions is usually about...
  19. X

    how to realize a perfectE plane!

    while simulating,I set a horizontal stripline connected with a vertical perfectE plane at the end of the stripeline. I have thought that I could make a big ground plane conected with other ground plane to take place the perfectE.but the result is very terrible.I have no idea of how to realize...
  20. X

    Broadband bandpass filter with microstrip line!

    TKS very much,you are so kind. But this structure is so hard for general manufacture . I see many books and papers saying interdigital model can achieve a broadband function.But I can't get the result with microstrip.whether it's impossible achieving a broadband function with interdigital...

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