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This thesis focusses on the development of an integrated oscillator for automotive applications. The oscillator operates based on the Barkhausen criterion, which is a mathematical requirement used in electronics to predict whether a linear electronic circuit will oscillate. In this thesis, a voltage-controlled oscillator is designed for increased performance under various process, voltage and temperature (PVT) conditions. By applying a voltage reference block, the output frequency of 0.5MHz, 0.75MHz, 1MHz or 1.25MHz can be obtained. In order to compensate for the variations at PVT corners, the trimming technology is applied to increase the accuracy. The supply voltage is considered to be varying between 2.1V and 5.5V while the temperature range is -40oC -125oC.