TCXO noun explanation and principle application

TCXO (Temperature Compensate Crystal Oscillator) is a type of temperature compensated crystal oscillator that reduces the frequency change caused by ambient temperature changes through an additional temperature compensation circuit. It is an active device and typically has a frequency stability of ± 0.5 ppm to ± 5 ppm throughout the entire operating temperature range.
Due to its high frequency stability and small size, TCXO can quickly start at low currents, and its application areas have been expanded to mobile communication systems. TCXO serves as a reference oscillator to provide a frequency reference for the transmission signal and as the first stage local oscillator for the reception channel; The other TCXO serves as the second local oscillator and inputs its oscillation signal to the second frequency converter. The frequency stability required for mobile phones is 0.1-2.5ppm (-30~+75 ℃), but due to cost considerations, the commonly used specification is 1.5-2.5ppm.