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A ΔΣ modulator with dual-VCO-based quantizers is proposed to enhance SFDR of the converter. To alleviate the nonlinear VCO voltage-to-frequency tuning characteristics, a shifted-averaging dual VCO architecture is proposed. Furthermore, a VCO which merges a voltage summer and a current DAC for excess loop delay compensation is designed, drastically reducing the complexity of the circuit. The measured...
A spread spectrum clock generator (SSCG) based on an offset phase-locked loop (OPLL) for the Serial AT Attachment 3 (SATA-III) is presented in this paper. The SSCG can be applied to many systems due to its characteristic of spreading the energy of frequency harmonics and reducing the radiated power per unit bandwidth. In the proposed architecture, a low-frequency spread spectrum signal is synthesized...
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