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This paper presents a wide-tuning frequency generation scheme based on bottom-series coupled quadrature VCO (QVCO). The low band and middle band frequency signal is generated from the QVCO while the high band signal is obtained from a gilbert mixer. The tuning-range enhancement technique allows a three band frequency generation in the range from 2.4GHz to 8.4GHz without penalizing its phase noise...
This paper presents a capacitive-coupling technique for multi-phase oscillators. The proposed capacitive coupling techniques can improve the phase noise performance while maintain good phase accuracy over wide frequency range for multi-phase oscillators. A prototype two-phase VCO is analyzed using injection-locking theory and implemented to demonstrate the effectiveness of the capacitive-coupling...
A 4.8–6.8GHz phase-locked loop (PLL) with a power optimized multi-modulus divider (MMD) for wireless and radar applications is presented in this paper. Based on the timing delay analysis and the self-oscillation frequency of the divider cells, the power consumption of the divide-by-two circuit (DTC) and divide-by-2/3 cells can be optimized, and thus minimum power consumption for divider chain can...
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