A Process And Temperature Compensated Two-Stage Ring Oscillator

Kadaba Lakshmikumar,Vinod Mukundagiri,Sander Laurentius Johannes Gierkink

PROCEEDINGS OF THE IEEE 2007 CUSTOM INTEGRATED CIRCUITS CONFERENCE（2007）

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摘要

Local positive feedback in a delay element enables a ring oscillator with only two stages to oscillate and produce quadrature clocks. Routh-Hurwitz's criterion is applied to prove that such a structure can oscillate. An internally generated power supply from a constant-gm bias keeps the free running frequency to within +/- 5% from -40 to 125 degrees C over process variations. The 1.25GHz (oscillator in 0.13 mu m CMOS draws 3.4mA and has a phase noise of -88dBc/Hz at 1MHz offset.

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关键词

synchronisation,ring oscillator,positive feedback,process variation,low power electronics,oscillations,phase noise

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