Thermostatic crystal oscillator

Constant temperature Crystal Oscillator referred to as constant temperature crystal oscillator, English abbreviation OCXO (Oven Controlled Crystal Oscillator), is the use of constant temperature tank to keep the temperature of the quartz crystal resonator in the crystal oscillator constant. The amount of oscillator output frequency variation caused by changes in ambient temperature is reduced to the smallest crystal oscillator. The OCXO is composed of a thermostat control circuit and an oscillator circuit. Usually people use thermistor "bridge" composed of differential series amplifier to achieve temperature control.