| With decades’ advance in integrated circuit technology, critical dimension nowcomes to its nanometer era. IC in22nm process has already entered the stage of massproduction, which enables109logic gates to be integrated in an area of1squaremillimeter. Thus the energy consumption density is very high, bringing about manyproblems, such as heat radiation, stability, etc. Meanwhile, digital products becomingportable, their energy cost determines the lifetime of the system supported by batteries.How to cut down the power of the digital circuits is one critical subject and main bottleneck of the development of he digital circuits.This thesis focuses on low power consumption, designing a nixed signal systemwith Minimum Energy Point Tracking technique based on BUCK DC-DC converter inPSM called MEPT system. Energy consumed by digital circuits is divided into dynamicpart and static part. The former results from gates turning decreasing with the powersupply voltage of the circuit while the latter caused by leakage current increases whenworking voltage goes lower because of longer delay. Therefore, there stands a voltageunder which the total energy cost of the digital circuits reaches its minimum. Thisvoltage is the Minimum Energy Point. MEPT is the technique that searches for the MEPfrom the highest voltage to lowest one using slope algorithm and then fixes the outputvoltage to minimize the energy consumption of the digital load.This thesis starts with the analysis of the digital circuits’ power consumption anddemonstration of the existence of MEP. Then MEPT system is constructed and itselements are defined, followed by the requirements, the circuits and the simulationresults of each element. The design are displayed wholly at last The simulation resultsshows that the MEPT system achieves its function and saves up to55.12%energy costof the digital load. Current test results indicate that the converter and the load work asdesign’s expectation while the MEPT is waiting for more tests. |
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