Design of Self Calibrated DLL Based Clock Generator Using Modified GDI Technique
Journal: International Journal of Scientific Engineering and Research (IJSER) (Vol.5, No. 3)Publication Date: 2017-03-05
Authors : C. Naveena; S. Purushothaman;
Page : 67-70
Keywords : Calibration; dynamic frequency scaling (DFS); delay-locked loop (DLL); extendable instruction set computing (EISC).;
Abstract
Abstract: This paper describes a low-jitter delay-locked loop (DLL)-based clock generator for dynamic frequency scaling in the extendable instruction set computing (EISC) processor. The DLL-based clock generator provides the system clock with frequencies of the reference clock, according to the workload of the EISC processor. The proposed self-calibration method and a phase detector with an auxiliary charge pump can effectively reduce the delay mismatch between delay cells in the voltage-controlled delay line and the static phase offset due to the current mismatch in the charge pump, respectively. The self-calibrated output waveform exhibits 9.7 ps of RMS jitter and 73.7 ps of peak-to-peak jitter at 120 MHz. The prototype clock generator implemented in CMOS process occupies an active area of 0.25 ?m and consumes power.
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