標題: A portable digitally controlled oscillator using novel varactors
作者: Chen, PL
Chung, CC
Lee, CY
電子物理學系
Department of Electrophysics
關鍵字: all-digital phase-locked loop (ADPLL);cell-based hardware-description language;digitally controlled oscillator (DCO);digitally controlled varactor (DCV);PLL
公開日期: 1-五月-2005
摘要: This work presents a portable digitally controlled oscillator (DCO) by using two-input NOR gates as a digitally controlled varactor (DCV) in fine-tuning delay cell design. This novel varactor uses the gate capacitance difference of NOR gates under different digital control inputs to establish a DCV. Thus proposed DCO can improve delay resolution 256 times better than a single buffer design. This study also examines different types of NOR/NAND gates (2-input or 3-input) for DCV. The proposed DCO with novel DCV can be implemented with standard cells, and thus it can be ported to different processes in short time. Furthermore, the final circuit layout can be generated using an auto placement and routing (APR) tools. A test chip demonstrates that LSB resolution of the DCO can be improved to 1.55 ps with standard 0.35-mu m 2P4M CMOS digital cell library. The proposed DCO has good performance in terms of fine resolution, high portability, and short design turnaround cycle compared with conventional DCO designs.
URI: http://dx.doi.org/10.1109/TCSII.2005.846307
http://hdl.handle.net/11536/13743
ISSN: 1057-7130
DOI: 10.1109/TCSII.2005.846307
期刊: IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
Volume: 52
Issue: 5
起始頁: 233
結束頁: 237
顯示於類別:期刊論文


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