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A 1V, 1mW, 4GHz InjectionLocked Oscillator for High-Performance Clocking

By Lin Zhang, Berkehan Ciftcioglu and Hui Wu


Abstract — Injection-locked clocking (ILC) has been proposed [1] to improve the skew and jitter performance while reducing the power consumption in multi-gigahertz clock distribution networks. This paper presents a new design of the injectionlocked oscillator (ILO) suitable for ILC applications. It uses a transformer to generate differential signals and then directly inject them into the ILO core. It also incorporates a switchedcapacitor array for frequency tuning and hence digital deskew in ILC. A 4GHz test chip was designed and fabricated in a 0.18um standard digital CMOS. It consists of four ILOs driven by a balanced H-tree. Each ILO consumes less than 1mW from a 1V power supply. 5-bit digital deskew achieves 55ps delay tuning range and 1.8ps resolution. Measurement shows that only 30fs cycle-to-cycle jitter degradation was introduced and no phase noise degradation at frequency offset up to 600kHz. I

Year: 2007
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