Thermal regulation of double oven controlled crystal oscillator, DOCXO

The presentation will discuss the differences and advantages of a thermal regulating system using the integral proportional method. The design study compares the results with a double oven controlled crystal oven using a simple integral thermal regulation. The obtained results using the described method show considerable improvement of frequency stability with temperature and the warm up time is much reduced : -20°C+70°C<1.10^-10 10 min <5.10^-10 The holder size is also reduced to 50×50×38 mm. The simple proportional regulation method very much depends on the external conditions and the various thermal losses of the mass to be thermally regulated. Effectively this method is used to compensate for thermal losses of the system. The proportional integrated method overcomes the problem and is therefore more suitable for high stability oscillators. The principal problem to resolve is to understand and control the oven thermal constants as a function of the time constants of the integration