Abstract: OCXO（Oven Controlled Crystal Oscillator）is one of the key devices in electronic equipment,which is widely used in mobile communication,navigation radar and metrology measuring equipment.A large number of domestic frequency source stability tests adopt the test method of frequency comparison,which requires a high stability reference source as a reference for short-term frequency stability,but the high performance ultra-stable OCXO usually used for measurement is expensive and the procurement cycle is long,which limits the test application of many engineering projects.This paper presents a 10 MHz OCXO with excellent short-term stability.The product uses a TO packaging SC cut crystal resonator.The oscillating part is a Colpitts circuit and the temperature regulator part uses a modified proportional integrated temperature-controlled circuit with dual Operational amplifiers.The experiment results show that the OCXO’s short-term stability is 1.46E-13/1 s,1.52E-13/10 s;the phase noise is -120 dBc/Hz@1 Hz,-137 dBc/Hz@10 Hz and -147 dBc/Hz@100 Hz;the frequency-temperature stability is ±2.98E-10 at -40~70 ℃.

Key words: Oven Controlled Crystal Oscillator(OCXO), Frequency stability, Phase noise, Allan variance