A Latency-Proof Quantization Noise Reduction Method for Digitally-Controlled Ring Oscillators

作者：Liu Chengwen^*; He Rui; Yu Xueyi; Rhee Woogeun; Wang Zhihua

来源：53rd Midwest Symposium on Circuits and Systems (MWSCAS 2010), Seattle, WA, United states, 2010-08-01 To 2010-08-04.

DOI：10.1109/MWSCAS.2010.5548570

• Circuit-level simulation
• Delta sigma modulator
• Digitally controlled
• Fractional-N PLL
• Noise reduction methods
• Parallel operations
• Quantization noise reductions
• Ring oscillator

This paper describes a quantization noise reduction method for Delta Sigma based digitally-controlled ring oscillators (DCRO). A concept of the hybrid finite-impulse response (FIR) filter from the fractional-N PLL is extended to the DCRO design. Thanks to the parallel operation, the proposed filter based noise reduction method does not cause any additional latency to the digital PLL. Both behavioral and circuit-level simulations are performed, showing that out-of-band phase noise or short-term jitter caused by the Delta Sigma modulator can be significantly reduced with the proposed method.

• 出版日期2010
• 单位清华大学