Key Block Design Of Adaptive Voltage Scaling Based On Delayline

With the improvement of manufacturing process and higher performance, ICpower consumption issues are becoming more and more outstanding. An efficientpower management technique called Adaptive voltage scaling (AVS) is proposed inrecent years. It can adjust load voltage according to different processes, temperaturesand load frequencies, which facilitates minimizing load power consumption. Thus, itcan reduce load power consumption by30%-70%.Firstly, the paper represents the background and significance of the study, and thebasic principles of the AVS circuits well as a abstract of the main work of this paper areintroduced. Next, the paper introduces the low-power technique. Power consumptionconsists of dynamic power consumption and static power consumption. Accordingly thepaper proposes solutions to reducing power consumption based on the constitution ofpower consumption. The system-level low power consumption technique, which isdescribed in detail, remarkably optimize the system.. Compared to the dynamic voltagescaling (DVS) with look-up table, adaptive voltage scaling (AVS) is a more efficientvoltage scaling mode. There are three AVS circuit strategies introduced based on thedelay line, the error rate adjustment and all-digital circuit. These strategies have made atheoretical foundation for the next study.Secondly, this paper introduces the operating principles, as well as analyzes theoverall block diagram and sub-module of the AVS circuit, which is based on delayline.The analysis stresses on the delayline and the control circuit, according to the wellcomprehension of the overall circuit, which benefits the design progress. Theadjustment capacity and high regulation accuracy depend on the delayline and controlcircuit, two centers of determining that whether the voltage is appropriate.Over-temperature protection, over-voltage protection as well as the basic principlesand design of the circuits are introduced in detail. Fortunately, the design achieves a setof technical targets. Furthermore, on this basis, the simulation results and layout designof overall circuit are given in this paper.The design given sets the input voltage of3.3V and the output voltage from0.7V to1.5V by using a buck DC-DC converter voltage regulation.The load operatingfrequency is from30MHz to120MHz in PSM mode. The key modules, the delaylineand control circuit, can find the corresponding adaptive voltage at different frequencies.When over-voltage protection circuit works properly, over-temperature protectioncircuit can cut off the main circuit at109℃and open again at78℃. Above all, thecircuit can regulate voltage properly in different process corners, and set technicalindicators.In the end, in addition to the summary of the author’s work, this paper points outthe shortcomings in this paper which need to dig deep.