60 khz in connection with a high q saw resonator the present invention with the component values described provides for either embodiment a tune range of at least approximately 400 khz for sonet clock recovery applications in which variances of up to 500 parts per million ppm must be tolerated the required tune range for a center frequency of 622 mhz is approximately 300 khz fig3 a through 3d are frequency response plots illustrating the operation of the two port saw resonator according to one embodiment of the present invention the output amplitude and phase for a tunable saw resonator circuit of the type described above are plotted for a 2 5 mhz range of frequencies centered on 622 2 mhz the output amplitude 301 is plotted on a scale of 5 decibels db per division while the output phase 302 is plotted on a linear scale of 900 per division in fig3 a the tuning voltage applied to varactor diodes within the tunable saw resonator circuit to adjust the capacitance is zero the resulting output signal amplitude has a center frequency of 622 159375 mhz a maximum signal amplitude of u2212 7 4807 db and a phase of u2212 48.