A temperature-controlled crystal oscillator

A co-planar temperature-controlled crystal oscillator (CPXO) for precision frequency generation is described. All of the oscillator and temperature-control electronics are contained on one double-sided beryllium oxide substrate. This construction allows a more accurate control of crystal temperature than the classical ovenized approach. At the same time, the package size is reduced by eliminating the need for a separate oven. Smaller heated mass combined with greatly shortened thermal paths results in much shortened warmup time. Smaller surface area results in a reduced need for heater power to sustain operating temperature. These advantages of the CPXO are obtained without sacrificing the desirable features of the much larger ovenized crystal oscillator.<>