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In this paper, a dual-band wide-tuning-range quadrature VCO (QVCO) using a harmonic-injection coupling technique is proposed. The tuning range of a switched-capacitor and a switched-inductor LC-tank are investigated. Based on the investigation, a switched-inductor tank is employed since it provides a wide tuning range. A harmonic-injection coupling technique, which eliminates the noise sources of...
This paper presents a low power high performance frequency synthesizer. Based on the current-reuse VCO architecture, the whole system power consumption is significantly saved with excellent phase noise performance. Imbalance amplitude problems caused by the unsymmetrical VCO are solved by the pre-tuning mechanism, which automatically chooses the correct frequency band for the certain frequency channel...
This paper proposes a charge pump with a symmetric structure that minimizes mismatch between charge and discharge currents and phase offset. The origins and influences of charge pump mismatch are discussed and theoretically analyzed. Subsequently the simulation results of the proposed charge pump are compared with conventional structures to show its benefits.
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