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An all-digital clock generator for dynamic frequency scaling

Wei-Ming Lin, Chao-Chyun Chen, Shen-Iuan Liu

Open publisher page 8 citations

Abstract

An all-digital clock generator for dynamic frequency scaling is presented by using a cyclic clock multiplier. It realizes the fractional or multiplied output clock within four reference clock cycles. The frequency of the output clock can be programmed as Mfref/N (frefis the reference clock frequency, 1lesMles7, and 1lesNles8). It has been fabricated in a 0.18 um CMOS process. The measured rms jitter of the output clock is 3 ps when the input clock is 133 MHz, M is 7, and N is 1 and consumes 53 mW from a supply of 1.8 V. The core area of this clock generator is 0.26 mm2.

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What this paper is about

An all-digital clock generator for dynamic frequency scaling is presented by using a cyclic clock multiplier. It realizes the fractional or multiplied output clock within four reference clock cycles. The frequency of the output clock can be programmed as Mfref/N (frefis the reference clock frequency, 1lesMles7, and 1lesNles8). It has been fabricated in a 0.18 um CMOS process. The measured rms jitter of the output clock is 3 ps when the input clock is 133 MHz, M is 7, and N is 1 and consumes 53 mW from a supply of 1.8 V. The core area of this clock generator is 0.26 mm2.

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OpenAlex reports 8 citations for this work. Citation counts describe recorded attention and do not establish research quality.

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Available abstract

An all-digital clock generator for dynamic frequency scaling is presented by using a cyclic clock multiplier. It realizes the fractional or multiplied output clock within four reference clock cycles. The frequency of the output clock can be programmed as Mfref/N (frefis the reference clock frequency, 1lesMles7, and 1lesNles8). It has been fabricated in a 0.18 um CMOS process. The measured rms jitter of the output clock is 3 ps when the input clock is 133 MHz, M is 7, and N is 1 and consumes 53 mW from a supply of 1.8 V. The core area of this clock generator is 0.26 mm2.

Key concepts: Clock generator, Jitter, Clock rate, CPU multiplier, Scaling, Generator (circuit theory), Computer science, Multiplier (economics)

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