I want to generate a high frequency (4.25 GHz) clock for a high frequency communication circuit. So, my question is:

What are the alternate ways of generating the high frequency clock and which would be the best way out?

Some pointers to components/ICs would also be of great help.

  • 2
    \$\begingroup\$ Stability specs? \$\endgroup\$
    – Russell McMahon
    Jan 25, 2012 at 13:41
  • \$\begingroup\$ Is this homework / assignment? \$\endgroup\$
    – Russell McMahon
    Jan 25, 2012 at 14:00
  • 1
    \$\begingroup\$ More detail please. Is this homework. If so, tell us what is being asked of you and we will help you learn. \$\endgroup\$
    – Russell McMahon
    Jan 25, 2012 at 14:07
  • \$\begingroup\$ @RussellMcMahon: No, this is not homework. I am designing a high bandwidth (500 MHz) communication circuit around 4.25 GHz central frequency. I am not sure of stability specs. \$\endgroup\$
    – Neel Mehta
    Jan 25, 2012 at 14:14

1 Answer 1

  • SAW

    Impatt Diode

    Gunn Diode

    Magnetron / Klystron / TWT

    Esaki diode (tunnel diode)


    Fractional N synthesiser.

    More ...

For $US35.70/1 on stock you can gete 1 GHZ fxo modules from Digikey here for prices.

FXO-PC73 series. Up to 1.35 MHz. Multiply in various ways from there.
Datasheet here They say:

  • EXTREMELY Low Jitter
  • Low Cost
  • Frequency Resolution to six decimal places
  • Stabilities to ± 20 PPM
  • -20 to +70°C or -40 to +85°C operating temperatures
  • Serial ID with Comprehensive Traceability

For $5/1 you can buy synthesiser ICs that cover your range.
Typical example only

Datasheet TI LMX2434

Gunn diode oscialltyors using cavities for fequency tuning and with varactors for tuning are a time honoured solution and may give you power levels that can be used directly.

more intro - good

ZAX Gunn oscillators
Zax catalog - very pretty

Gunn XBan - well above your range useful

Ham Radio mag 1980 DIY 10 GHz - very relevant if DIYing here

MUCH more. More detail please. Is this homework. If so, tell us what is being asked of you and we will help you learn.

  • \$\begingroup\$ Does the integer-N PLL (which can go upto 64/5) allow locking into any multiples of the oscillator/crystal frequency? or is it just powers of 2 (e.g. 32/33, 64/65, etc)? \$\endgroup\$
    – Neel Mehta
    Jan 26, 2012 at 6:43
  • \$\begingroup\$ If I use a 50 MHz crystal and a PLL frequency synthesizer like ADF4108, can I generate a 4.25 GHz clock? \$\endgroup\$
    – Neel Mehta
    Jan 26, 2012 at 7:04

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