50Mhz-vhf-crystal-oscillator


Posted on Jan 22, 2013

Diagram shows a 50MHz oscillator operating on a third harmonic. The collector`s load resistor R1 has been increased because the quartz crystal`s internal series resistance Rs increases with frequency in the VHF range. The crystal`s internal series resistance Rs is 30ohm, and the transistor`s minimum current gain HFI, is 100.


50Mhz-vhf-crystal-oscillator
Click here to download the full size of the above Circuit.

Using the same technique as for the 20 MHz oscillator, the external series RLCL equivalent load seen by the 50MHz crystal is 5.6ohm (RL) and 1000pF (CL).




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