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Recent content by mwvco1

  1. M

    PLL losing locking at low temperature

    maybe，but why？ if I test the vco or hmc704 independently，they are ok. I can't find which index is abnormal ??
  2. M

    PLL losing locking at low temperature

    Hi,all We recently design a pll using hmc704,but have some problems below low temperature(-45℃), the pll can‘t lock. the output frequency of vco is 6.49~6.9GHz and we want a frequency of 6.65GHz, the pll works proper at room temperature and high temperature So we open the loop to debug，the...
  3. M

    [SOLVED] vco exist spur near dozens of khz

    hi， today we have some experiment. 1.the BJT (both the oscillator and the buffer) work in the saturation 2.BJT gain rises as temperature decreases 3.the output S11 is bad, the oscillating part is only -3db and the buffer is about -10db someone said that is probably a self-mixing,I couldn't...
  4. M

    [SOLVED] vco exist spur near dozens of khz

    the output power is about 10dbm,so the spur is about -10dbm. thank you for your reply.We will have a try according to your suggestion. Now I can't understand why this phenomenon occurs only at low temperature，and the spurs become strong as the temperature decreases？
  5. M

    [SOLVED] vco exist spur near dozens of khz

    I‘m not sure tuning the voltage sufficiently clean，and adding the filter circuit can improve the phase noise，but the spurs do not change at all. 2 tuning mechanism is to increase bandwidth.We have a try that fix one tank circuit ，the spur is the same.
  6. M

    [SOLVED] vco exist spur near dozens of khz

    the spur is about -20dbc. when the output amplifier powered down ，the spurs didn't disappear，but stronger a little the Vt is generated by E5052b，but also produce a fixed voltage using the battery
  7. M

    [SOLVED] vco exist spur near dozens of khz

    it's not a pll,just a vco - - - Updated - - - this is the schematic . and we have used the battery as power supply，but it did not work
  8. M

    [SOLVED] vco exist spur near dozens of khz

    Hello， We recently designed several kinds of vco.Its structure is similar to Colpitts.Its frequency is about 3-7GHz. We have a problem that the output of the vcos have a spurious at dozens of khz when the temperature below about -40 ℃. We have made several experiments,and found that 1.when...
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