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Recent content by AP31

  1. A

    HF band (500KHz to 30MHz)

    I'm in need of an input protection circuit for the front-end of an HF receiver. I'm currently using Schottky diodes (for large fast transient) and pin diodes for levels continuous waves that exceed 100mW (+20dBm). I'm trying to preserve intermodulation performance, so the pin diodes when...
  2. A

    Common Base RF amplifier (HF band)

    Could use some background information on designing a common base amplifier for High dynamic range performance (IIP2>+80dBm). I read some articles, but would like to know if some of you have some hands on experience with this topology.
  3. A

    L band Up Converter Suggestions

    A dual conversion is the safe approach. However, you should create a frequency plan so that you can determine other unwanted frequency terms such as image and Harmonics of the LO. I'm assuming that the 950-1700MHz band is broken up into at least 2 separate bands (950-1325MHz) and (1325 -...
  4. A

    fractional N frequency synthesizer for low IF RX targeting lte

    In general, I need more detail of what you're trying to design. Yes - you're designing a synthesizer, but what is it driving? Regarding "E" it totally depends on what levels you're trying to detect (minimum detectable signal, which is calculated by the following formula (MDS (dBm) = [-174+3dB]...
  5. A

    Phase locked loop: Trf 3750

    Have you initialized the PLL prior to sending your desired settings?
  6. A

    Osciloscope + active 1 GHz probe

    The short answer is, "NO". You need at least a 1GHz scope, but for square wave signals you'll need even a higher frequency scope because square wave signals are comprise of odd harmonics.If not the waveform on the scope will not look like a square wave because of the bandwidth limitation of the...
  7. A

    PLL phase noise changing with reference divider

    Your correct, What I'm proposing will not solve your problem,is just an idea that i have used in the past. Based on the spectrum plot you provided, i would replace the PLL with an external signal generator to see if the problem is in the LO or signal path. If the problem is still present, you...
  8. A

    PLL phase noise changing with reference divider

    One option is to use a IQ Modulator as a single sideband mixer on the transmitter side, such as the Hittite HMC495. This would allow you to reject the carrier and the unwanted sideband with at least >40dB, which i dont think you are getting with a low pass filter since the unwanted terms are...
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