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To improve the MCXO performance and simplify its structure, a new MCXO design method has been developed. Through deleting pulses of clock signal of a microcomputer and shifting its phase, the frequency-temperature stability of MCXO can be made satisfactory, and the DDS chip, which is often used in high performance MCXO, can be eliminated. Several different MCXOs have been made with this method and different performance specifications can be obtained. According to the simplicity, in a wide temperature range from -40 to +80/spl deg/C, the frequency-temperature stability of the MCXOs can be from /spl plusmn/3/spl times/10/sup -8/ to /spl plusmn/2/spl times/10/sup -7/.