A Low-Power Multi-Phase Oscillator with Transfer Gate Phase Coupler Enabling Even-Numbered Phase Output

Toshihiro KONISHI; Hyeokjong LEE; Shintaro IZUMI; Takashi TAKEUCHI; Masahiko YOSHIMOTO; Hiroshi KAWAGUCHI

doi:10.1587/transfun.E94.A.2701

Special Section on VLSI Design and CAD Algorithms

A Low-Power Multi-Phase Oscillator with Transfer Gate Phase Coupler Enabling Even-Numbered Phase Output

Toshihiro KONISHI, Hyeokjong LEE, Shintaro IZUMI, Takashi TAKEUCHI, Masahiko YOSHIMOTO, Hiroshi KAWAGUCHI

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Keywords: multi-phase oscillator, transfer gate phase coupler, even-numbered phases, low-power, process scalable

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2011 Volume E94.A Issue 12 Pages 2701-2708

DOI https://doi.org/10.1587/transfun.E94.A.2701

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Abstract

We propose a transfer gate phase coupler for a low-power multi-phase oscillator (MPOSC). The phase coupler is an nMOS transfer gate, which does not waste charge to the ground and thus achieves low power. The proposed MPOSC can set the number of outputs to an arbitrary number. The test circuit in a 180-nm process and a 65-nm process exhibits 20 phases, including 90° different angles. The designs in a 180-nm CMOS process and a 65-nm CMOS process were fabricated to confirm its process scalability; in the respective designs, we observed 36.6% and 38.3% improvements in a power-delay products, compared with the conventional MPOSCs using inverters and nMOS latches. In a 65-nm process, the measured DNL and 3σ period jitter are, respectively, less than ±1.22° and 5.82ps. The power is 284µW at 1.85GHz.

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