Design Of Energy Harvesting System For Microelectronic EMG Bridge

With the development of the Internet of Things in recent years,the use of body area networks to continuously monitor various human physical activity indicators in real time is gradually becoming a new hotspot in medical security system researches.However,for implantable or wearable devices in body area networks,although some breakthroughs have been made in low power consumption design,it is hard to completely overcome the limitations brought by battery capacity.This thesis designed a micro-energy harvesting chip based on TSMC 0.18-?m standard process for electromyographic bridge.First,the classification and typical structures of micro-energy harvesting systems are investigated in this article.Besides,thermoelectric conversion principle,human body surface heat radiation system,the development of TEG devices and boost converter at home and abroad are studied in detail.After that,to overcome the shortcomings of the low output voltage of the TEG devices,which is hard to make use of directly,overall design scheme of micro-energy harvesting system chip using high-efficiency boost clock is proposed and detailed design specifications are given.Secondly,the theoretical analysis of the linear charge pump topology model and the derivation of the output voltage under non-ideal conditions are done after the comparison of several typical charge pump structures.A cross-coupled charge pump structure is designed to overcome the drawbacks of traditional Dickson structure.Besides,the BT RVCO is developed to take advantages of the built-in charge pump to boost the output swing of the delay element,which can break through the limitation of supply voltage.This technology reduce the potential parasitic losses and improve the efficiency of boost conversion.Then,equivalent power model is given according to the linear charge pump topology,which emphasizes the importance of voltage regulator circuit.The comparator and bandgap reference in PSM system are designed after the comparison of voltage regulator structures.Finally,TSMC 0.18-?m CMOS process is implemented in the design of the schematic and layout,and the micro-energy harvesting system are simulated.The simulation results show that in case of 300 m V input voltage,the system can provide an output voltage amplitude of 2.18 V and the pump efficiency has reached 86.5%.The design solves the problem of traditional charge pump such as Dickson structure at low supply voltage.It meets the requirement of design specification.