an oscillator circuit comprising a bulk acoustic wave crystal clock oscillator that generates a high stability , tight frequency tolerance signal . this signal being multiplied by a surface acoustic wave 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 .