A temperature compensated crystal oscillator, often abbreviated as TCXO, offers remarkable frequency stabilities as tight as 10-7 or 10-6 by utilizing proper temperature compensation methods, such as capacitance compensation, thermistor compensation, etc. For SJK, our TXCOs are mainly divided into three series, which are 3225 SMD TCXO, 3225 SMD VCTCXO and 6T DIP TCXO.
TCXO not only has excellent frequency stability, but also exhibits advantages of small size as well as the ability to start up at low current. As a result, it plays a very important role in many communication systems, such as GPS, radar, navigation system, mobile communication, electronic measuring instrument, stored program controlled telephone exchange, etc. The following paragraph gives more details.
In mobile communication, a TCXO is the reference oscillator that provides reference frequency for the sending channel, and it also works as the first local oscillator of the receiving channel. On the other hand, another TCXO serves as the second local oscillator to transfer oscillation signals to the second frequency converter. For mobile phones, a frequency stability of 0.1ppm-2.5ppm (-30℃~+75℃) is preferred, but for cost considerations, TCXO oscillators with frequency stability of 1.5ppm-2.5ppm are often adopted.