Bulk acoustic wave crystal controlled clock with surface acoustic wave filter multiplier
AssigneeNEL Frequency Controls, Inc.
InventorsJerry Lichter, Randal Kohloff
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Abstract
An oscillator circuit comprising a bulk acoustic wave (BAW) crystal clock oscillator that generates a high stability, tight frequency tolerance signal. This signal being multiplied by a surface acoustic wave (SAW) filter multiplier that filters out all signals except the desired harmonic of the BAW oscillator signal resulting in a multiple of the BAW oscillator frequency with the frequency stability verses temperature of the original BAW oscillator signal. The output of the SAW filter is coupled to an amplifier/buffer to restore the SAW filter output signal to the desired signal level and/or waveform.
Claims23
An oscillator circuit comprising:
- a bulk acoustic wave (BAW) crystal oscillator;
- a filter coupled to the output of the BAW crystal oscillator;
- and
- an amplifier coupled to the output of the filter for amplifying the filter output to a desired signal level.
An oscillator circuit comprising:
- a bulk acoustic wave (BAW) crystal oscillator;
- a filter coupled to the output of the BAW crystal oscillator;
- and
- a buffer coupled to the output of the filter for driving a digital circuit.
A method for providing a high stability clock reference signal, the method comprising the steps of:
- providing a bulk acoustic wave (BAW) crystal oscillator;
- multiplying the output of the BAW crystal oscillator with a surface acoustic wave (SAW) filter multiplier;
- amplifying or buffering the output of the filter multiplier to a desired signal level and/or waveform.
Dependencies are inferred from the claim text.