Dual mode SC-cut crystal oscillator

The simultaneous dual mode oscillation circuit of the 5 MHz 3^rd overtone SC-cut crystal is designed using mode-selective linear phase crystal filters, for each C and B mode. The perturbable dual mode oscillation has been successfully eliminated over the temperature range from -20° C to +90° C. Temperature regulation is also achieved using B mode oscillation frequency which provides the temperature information of the SC-cut quartz crystal itself. Over the temperature range of -20° C to +70° C, the temperature of the SC-cut crystal has been locked within ±0.002° C converted by the heat frequency between C and B modes. The total power consumption at supply voltage of 12V, is less than 2.4W at +25° C in still air.