Design Optimization of OCXO to Fulfil the Phase Noise Requirement under Dynamic Load Condition

OCXO’s (Oven Controlled Crystal Oscillators) are used to control the stringent frequency stability requirements which is not possible in basic crystal oscillators or TCXO’s. When these OCXO’s are used under dynamic load condition, the electrical parameter - phase noise shall get disturb/degrade and ending up with deviation in the required precision frequency for which it is designed. Mechanical design of such OCXO has the limitation in terms of amount of vibration being transferred to the crystal. To minimize the amount of vibration transfer to the crystal, one needs to use the isolators/dampers having good damping co-efficient. This paper explains the design, development, testing and qualification of OCXO to meet the precise frequency requirements under dynamic condition, also the details about the selection of isolators/dampers and mounting conditions to arrive at the better and acceptable results under dynamic load condition.