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.