A low-power adaptive bandwidth PLL and clock buffer with supply-noise compensation |
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Authors: | Mansuri M. Yang C.-K.K. |
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Affiliation: | Dept. of Electr. Eng., Univ. of California, Los Angeles, CA, USA; |
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Abstract: | This paper describes a fully integrated low-jitter CMOS phase-locked loop and clock buffer for low-power digital systems with a wide range of operating frequencies. The design uses static CMOS inverters as a building block of the voltage-controlled oscillator and clock buffering. To reduce supply-induced jitter, programmable circuits with opposite sensitivity compensate for the delay variations. Both elements have supply-induced delay sensitivity of /spl les/0.1%-delay/1%-V/sub DD/. The design is fabricated in 0.25-/spl mu/m CMOS technology and consumes 10mW from a 2.5-V supply. The experimental results verify that the proposed methods significantly improve the jitter. |
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