| Author | Message | | | eric | | Posted: Sun Sep 10, 2006 9:26 am Post subject: Crystal frequency multiplier | | | | Site Admin Joined: 01 Jan 1970 Posts: 311 | H. Bonekamp
Crystals for operation above 20 MHz are invariably cut to an overtone
(harmonic), which may be the third, fifth, or seventh. In other
words, the fundamental frequency of such a crystal is a third, fifth
or seventh of the operating frequency. If, however, an overtone
crystal is used in an oscillator designed for operation on the fundamental,
it is doubtful whether the wanted frequency will be generated.
In most such cases, there are difficulties that make it necessary
for the oscillator circuit to be modified.
One practical solution for such problems is offered by the circuit
in the diagram, which enables frequencies up to 160 MHz to be
generated
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