Before I commit the soldering iron, can anyone share their sub-harmonic
injection locking experiences ?
I have to make 393.216 from 49.152 .
Yes, lots of ways.... I know.
injection locked at 1/8 of the frequency from the decent source.
There wont be any issue of locking to the wrong harmonic, the VCO will
be on the money.I was thinking of using a dielectric loaded TEM
resonator or TEM coax line VCO .
and why do this : ?
- I need all the non related spurs to be > 115dB down.
- a double-double-double could work, but my experience is for x2 x2 x2 I
really need to filter well at each stage to avoid sum and difference
products.. which might be OK for this application , especially if I
filter really well after the first x2 . but avoid if I can. filters at
908 MHz need space, and shield cans where it is going.
- and I dont know too much about phase noise and SRD or varactor
multipliers. but maybe that's an option.
- my attempts at generating low phase noise x6 with class C multipliers
has been dismal.
- onboard VCO chip/PLLs have all sorts of unrelated spurs in the output.
- sure I can use a good PLL and a external VCO, but if my N value is
fixed, and I can use injection locking, why bother with the PLL chip
that is likely to introduce PD related spurs anyway.
regards
glen
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