The Microcomputer Compensated Crystal Oscillator And The MCXO Test System

This paper presents a new type of microcomputer compensated crystal oscillator (MCXO) which bases on AT-cut crystal and uses microcomputer as its core. System structure, the design of every part of hardware and software are given. A set of development equipments used for developing MCXO is also presented .We discuss the possibility of using the development equipment to make and test the MCXO. By using this equipment we can save much human resources in making MCXO procedure. We also introduce a kind of data processing method used to formulate the acquired date. The experimental data prove the temperature compensated method is viable. Comparing with digital temperature compensated crystal oscillator (DTCXO), the MCXO introduced in this paper has many advantages as follows, simple in structure, small in size, low in power, low in price and short in startup time. The MCXO can output an stable frequency of 10MHz, and after compensated its frequency-temperature stability can arrive at+1.5x10-7.