The term OCXO is an acronym for Oven Controlled Crystal (Xtal) Oscillator. The OCXO is a quartz-based timing
device (clock) utilized in precision timing applications. When stability and accuracy requirements exceed the
capabilities of other quartz-based frequency control devices such as a XO (clock oscillator), a VCXO (voltage
controlled crystal oscillator), or a TCXO (temperature compensated crystal oscillator), an OCXO is called upon to
provide the necessary performance.
OCXOs bridge the stability gap between a TCXO and atomic clocks and are
the highest performing members of the quartz-based class of oscillators.This article will discuss the operation
of OCXOs, the highest stability quartz-based timing device, and help gain insight to their operation.
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