Author : Ambica N 1
Date of Publication :20th July 2017
Abstract: Oven controlled crystal oscillator have been widely used in global positioning systems, communications, metering, telemetry control, spectrum, network analyzers and other electronic equipments as a source of time-frequency signal with high precision. OCXO is currently has the highest frequency stability and has the best accuracy in the market. OCXO consists of Quartz Crystal, oscillator circuit, temperature sensor, heat source and oven control circuit. Usually, thermistors are used as the temperature-sensing device. The thermistors sense an ambient temperature variation by a change to a slightly different resistance value. The controller circuitry consists of passive components, and it controls the amount of power generated in the heat source. OCXO use a heater to stabilize the temperature of the crystal at turnover point, thereby stabilizing the oscillating frequency. This design optimization achieves higher stability, even more compact size
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