The work is devoted to research in frequency stability of miniature integrated OCXO packaged in TO-8 vacuum holder. Since a number of electronic components and materials are involved in the unit design such investigations are of primary interest. The paper describes results of a long-term stability (aging) test of the OCXO during the period of about 2 years. Besides aging, various experiments including retrace and frequency hysteresis measurements are presented in the paper.Carried out experiments proved that developed hybrid technology is suitable for fabrication of high stability miniature OCXO.
This work describes the use of the Directly Heated Resonator (DHR) technology in miniature OCXO. Two designs incorporating DHR technology have been developed. One is a Resonator Thermostat (RT) housed in a standard TO-8 package. It contains a directly heated SC-cut crystal and thennocontroller circuit. The other is an OCXO packaged and hermetically sealed in a standard 14 DIP. This design integrates an RT and the oscillator circuitry in one package.Two designs develGped for this project have demonstrated performance in terms of fiequency stability an order of magnitude better than currently available TCXOs, while being comparable in size, power consumption and warm-up time to the latter. This paper discusses design considerations and test results.
Modern instrumentation equipment, commercial & defense communication systems, and radar equipment require excellent stability, extremely low phase noise frequency sources. Testing devices that exhibit phase noise of -120 dBc/Hz at 1 Hz offset from the carrier and better than -180 dBc/Hz on the noise floor is a challenge using existing test equipment and methods. It is especially pertinent to production environment, where measurement time and accuracy of each measurement becomes critical. The purpose of this work was to investigate different test methods, evaluate different phase noise measurement equipment, and find acceptable solutions for both low frequency (around 10 MHz) Ultra Low Phase Noise (ULPN) reference, and HF/UHF ULPN OCXO. Several test methods and test instruments were investigated. There's no "one size fits all" solution, but for each frequency range the optimum solutions were proposed.
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