Re: simple frequecny multiplier


colin wrote:
> "Mark" <makolber@xxxxxxxxx> wrote in message
> news:1112838867.605964.21180@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> > probably better off with a pll
> >
> > mark
> >
>
> i dont see how it'l be better, it can only add to the phase noise
wich im
> trying hard to avoid, and lot more complication wich is probably
harder to
> debug then a single stage distorting amplifier with tuned output.
maybe the
> fundamental wil be beter supresed but this wil be easy to supres
further
> with another filter.
>
> Colin.

The advice Mark gave to use a PLL is pretty sound. What is the phase
noise requirement?
You could end up with lower phase noise using a PLL than with a
multiplier. If you do use
a multiplier, consider a step recovery diode if you're trying to do it
in one go. Otherwise,
consider a two or three stage multiplier.

The best you can do with a 25x multipler is 25x the phase noise offset
of the source. The phase
noise of the PLL will be dominated by the VCO if you do it right, and
that is determined
mostly by the loaded Q.

see the following text:
Microwave Circuit Design Using Linear and Nonlinear Techniques
by Vendelin, Pavio, and Rohde.

Frank Raffaeli
http://www.aomwireless.com/

.

Relevant Pages

  • Re: simple frequecny multiplier
    ... You could end up with lower phase noise using a PLL than with a multiplier. ... If you do use a multiplier, consider a step recovery diode if you're trying to do it in one go. ... it in one go as such the harmonics from the xtal oscilator contain suficent ...
    (sci.electronics.design)
  • Re: Can PLL Freq Error be zero?
    ... If the reference frequency is 100.0000000MHz and the PLL is ... >>freq 200.0000000MHz with phase noise? ... the frequency error is zero. ...
    (sci.electronics.design)
  • Re: QPSK carrier recovery with multiply filter divide circuit
    ... filter at 4 Mhz to get rid of any other harmonics. ... use a PLL? ... the band pass filter with a 3 Mhz signal...(This multiplier would be ... the phase detector in the PLL) The difference and sum frequencies ...
    (comp.dsp)
  • Re: Can PLL Freq Error be zero?
    ... > All PLL chips specify phase noise and application notes talk about ... If the reference frequency is 100.0000000MHz and the PLL is ... > freq 200.0000000MHz with phase noise? ...
    (sci.electronics.design)
  • QPSK carrier recovery with multiply filter divide circuit
    ... filter at 4 Mhz to get rid of any other harmonics. ... use a PLL? ... the band pass filter with a 3 Mhz signal...(This multiplier would be ... the phase detector in the PLL) The difference and sum frequencies ...
    (comp.dsp)