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Recent content by parra

  1. P

    Use of LC filters below 1 MHz

    Thanks alot for your replies, I think I've got it now :)
  2. P

    Use of LC filters below 1 MHz

    Years ago I learned that passive CL filters have less losses than passive RC filters, as, if they are in resonance, have almost no resistance. Also, to get a 2nd order filter, you need just two elements (1 x C, 1 x L) compared to four elements you'd need for a 2nd order RC filter (2 x R, 2 x C)...
  3. P

    Buying an Oscilloscope

    Always depending on what you need the scope for and how much money you're willing to spend. I don't know this specific model, but usually you can't be doing that much wrong with buying a Fluke - it probably wouldn't disappoint you.
  4. P

    Question about layout / placement of crystal

    The way the pins are connected is how it's explained in the datasheet (see attached picture) The two bottom pins are the two clock inputs. The pin in the upper row is OSC Out. In the datasheet it's written, that the crystal has to be connected to CLK A on one side, and connected to CLK B and...
  5. P

    Question about layout / placement of crystal

    Well, it's a through-hole-IC. The IC is on the top layer, but it's pins are soldered on the bottom layer. The crystal is a SMD-one, so it is also soldered on the bottom layer. So, in the end, there is a ground plane between the IC and the crystal. How to do it better then?
  6. P

    Question about layout / placement of crystal

    Hi, I've got a question about the attached picture: Is this good PCB layout? Some more infos: A two layer board is used. The top layer is a ground plane, routing is made on the bottom layer. A through-hole-IC is placed on the top layer. Between the IC's pins on the bottom layer, there is a...
  7. P

    help me out please ................(about antenna)

    The book by Stutzman/Thiele is quite a good one:
  8. P

    Why do we use microstrip filter instead of simple LC filter?

    Re: Why do we use microstrip filter instead of simple LC fil Yep, this is right - if you're building a LC filter for very high frequencies you're also building an antenna at the same time. Also inductors and capacitors have bigger losses and at high frequencies, an L can become a C and vice...
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    AM/ASK Demodulation in RFID-Reader

    mesure index de modulation ask Thanks alot for your reply, I should have mentioned those 15% beforehand, sorry for not doing that! I'm just seeing bits and bytes currently, so I just forgot that part. If I have 8 samples per bit, as I'm doing it currently, that would make... for 1*T (with...
  10. P

    add offset to AC signal

    You could use an opamp as an adder to put an offset to your AC signal. Just have a look here, this should give you a hint: **broken link removed**
  11. P

    AM/ASK Demodulation in RFID-Reader

    pic ask demodulation What do you mean by "the modulation should be decoded according to the used standard"? The signal is more or less a filtered (lowpass + highpass) ASK-signal (which uses FM0 code as specified in the UHF-RFID-standard DIN 18000-6b btw, if that's of interest). It just uses...
  12. P

    AM/ASK Demodulation in RFID-Reader

    pll to decode ask signal Hi, I've got a amplitude modulated signal which comes from a RFID transponder, which after doing some filtering looks similar to the one on the attached picture. This signal is sampled with the help of an analog/digital converter (sample frequency 80kHz) and for...

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