Both the constant temperature crystal oscillator and the temperature-compensated crystal oscillator belong to the crystal oscillator, which are all active crystal oscillators. Therefore, the oscillating circuit composed of the power supply needs to be added to work. The following will briefly introduce the difference between the two.
DefinitionThe constant temperature crystal oscillator is referred to as the constant temperature crystal oscillator. The English abbreviation is OCXO (Oven Controlled Crystal Oscillator). The temperature of the quartz crystal resonator in the crystal oscillator is kept constant by the constant temperature bath, and the variation of the oscillator output frequency caused by the change of the 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 a differential series amplifier composed of a thermistor "bridge" to achieve temperature control.
The temperature-compensated crystal oscillator, the temperature-compensated crystal oscillator (TCXO), is a quartz crystal oscillator that reduces the amount of oscillation frequency change caused by changes in ambient temperature by an additional temperature compensation circuit.
The term "temperature-compensated crystal oscillator" derived from a quartz crystal oscillator has reached the accuracy requirements for product applications. The definition of the temperature-compensated crystal oscillator is that the original physical properties of the piezoelectric quartz crystal (the frequency changes with the temperature into a cubic curve under the piezoelectric effect) are reversely changed by the peripheral circuit, so that the original frequency of the quartz crystal changes as small as possible with temperature. A quartz crystal oscillator made by a compensation method.
Constant temperature crystal 
Warm crystal oscillator
Constant temperature crystal oscillator, because the oscillation frequency of the crystal oscillator changes with temperature, in order to maintain the stability of the frequency, the crystal oscillator is controlled to operate at a constant temperature to improve the phase frequency characteristics of the crystal oscillator.
The temperature compensation crystal oscillator, because the oscillation frequency of the crystal oscillator changes with the temperature change, in order to counteract the influence of temperature on the crystal frequency, the resonant capacitance of the control crystal oscillator changes with temperature, and the temperature crystal effect is offset to improve the frequency stability.
Measurement accuracyThe general constant temperature crystal oscillator is two orders of magnitude higher than the temperature of the temperature compensation crystal oscillator. For example, the temperature-compensated crystal oscillator can generally reach -7 orders of magnitude, while the constant temperature crystal oscillator can reach -9 orders of magnitude. Therefore, the constant temperature crystal oscillator is generally used for high-end measuring instruments, such as frequency meters, signal generators, network analyzers, and the like.
The warm-up crystal oscillator has better startup characteristics. A constant temperature crystal oscillator requires a heating process even with the best heating elements available today. If you want to reach the -7 level, it will take about 5 minutes, and it will take even a day to reach the level of -9 or above. Therefore, the equipment that needs to work when it is turned on is not suitable. Such as weapons.
The general constant temperature crystal oscillator can do better than the temperature compensated crystal oscillator.
Whether it is a constant temperature crystal or a temperature-compensated crystal is nothing more than a source, providing a time base for your equipment. As long as you understand its performance indicators, you can substitute each other.
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