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Voltage controlled oscillators (VCOs) are an important part of transceivers. Phase noise is an important characteristic of oscillator design and is defined as the spectral density of the oscillator spectrum at an offset from the center frequency of the oscillator relative to the power of the oscillator. The effect of the oscillator's noise is one of the most important items in the designing of modern RF telecommunication systems. In this paper, we present the design and performance analysis of a 15 GHz voltage-controlled ring oscillator using the 130nm CMOS technology for operating in high-speed applications. For improving the efficiency of the ring oscillator in the transceiver, different techniques such as transistor sizing are employed. In comparison to other publications, the author’s ring oscillator design is optimized with reference to the central frequency and phase noise.
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