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  • Users: davicente
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  1. davicente

    FRECUENCY MEASUREMENT

    Hi VisiGoth What i am thinking is to make the DDs to sweep its frecuency in order to mix it with the fix frecuency I have to measure.In theory, when both frequncies are pretty the same, I will obtain from the mixer something near a DC voltage, when this happens, DDS should stop sweeping and a I...
  2. davicente

    FRECUENCY MEASUREMENT

    Hi again, I can't use an external meter. I need to make a littel module to be integrated into a biger system. Frecuency is 1GHz and shouldn't vary more than those 10Khz, but you must be prepared to mesurea wider range, some MHz i was thinking about. Pulse width is from 350ns to 50us. The most...
  3. davicente

    FRECUENCY MEASUREMENT

    Hi all, I have to measure frecuency inside a 1Ghz pulsed signal, about 500ns wide. I think it is too narrow to try a traditional PLL, but maybe mixing with a DDS until i obtain a continious DC level (ripple should be specified depending on resolution:10Khz) and then reading their registers to...
  4. davicente

    Unexpected/unwanted output on 1GHz mixer

    Hi, apart from redducing input power levels, try filtering after mixing as spurious from both LO and RF signal could be producing undesirable mixing frecuencies
  5. davicente

    Simulations on digital modulation

    Hi, when i did some digital modulator develpment i used matlab in order to check waveforms and spectrums. It's easy and quite useful bye
  6. davicente

    AVIONIC AND RF

    Hi, my name is David and I'm working on a power amplifiers to be used in avionic.The final equipment is already being used but we've discovered some problems related with the radiated pulsed energy. Could anybody suggest a site, book, or anything where I could find precise information about the...
  7. davicente

    am80912-015

    Hello, my name is David and now I'm working with power amplifier in 1030/1090 MHz. I've been using the AM80912-015 ST transistor in my amplification chain, but now ST says that this transistor will be obsolete soon, so I'm looking for a substitute with similar characteristicas in order not to...
  8. davicente

    frecuency stability(PPM) in a PLL

    Hi again nbucska,actually, I have an specific question:I'm working with a DDS which handles a 300 MHZ clock to generate a 120 MHZ output signal.The system obtains the 300 MHz clock from a 20 MHZ(4 PPM) reference through a PLL with a x15 multiplication factor.I know that the output signal from a...
  9. davicente

    frecuency stability(PPM) in a PLL

    Thanks nbucska for your answer, but I didn't find a suitable article in the web, could you please be more specific about a weblink related with this topic? thanks again.
  10. davicente

    frecuency stability(PPM) in a PLL

    Hello, my name is David.I`d like to know if the frecuency stability of the output signal in a PLL is the same as in the clock reference used in the loop.I mean, if the reference clock is 4 PPM, and the PLL has a multilplicative factor x15 to obtain a 300 MHZ output signal, has this output signal...
  11. davicente

    120 mhz bandpass filter

    I'm working in a 120 mhz bandpass filter, i've designed it through a high-pass after a low-pass filter.The problem is that although i`ve simulated it with and without the pads and microstrip lines, whenever i make the PCB, i never obtain the desired results.I`ve tried to imulate it with RFSIM99...

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