| Summary: | 碩士 === 國立交通大學 === 電機工程學系 === 104 === This dissertation presents a battery powered self-cancellation DC-DC buck (SC-Buck) converter with 97% output voltage accuracy for biomedical devices in 28nm CMOS process. As the publics are paying more attention on the healthcare services. Advantages of portable biomedical devices become more and more obvious. Due to increasing average lifespan, the convenience healthcare delivery is urgently needed. A remote monitoring service, for example, helps the healthcare practitioners to observe any unusual symptom by monitoring the blood pressure, body temperature, heart beats, etc. These kinds of healthcare services highly depend on the support of portable medical devices. For portable devices, the battery is the key component to deliver power anywhere. Therefore, the battery of a medical device has been developed with lots of efforts. But power management unit (PMU) of medical devices, which directly delivers supplying voltage to systems, should also be carefully designed. Reliability and safety of power sources are important because any failure or malfunction is not a viable option when it comes to human life. On the other hand, IEC60601-1 standard also specifies the stability of supplying DC voltage. Due to above requirements, the proposed SC-Buck converter provides high accuracy and stable output voltage to the loading system. SC-Buck converter overcomes process, voltage and temperature (PVT) variations and increases output voltage accuracy up to 97% without any trimming procedures. The developed technique also overcomes the discontinuity in conventional offset cancellation scheme and reduces large silicon area occupation, which is required to decrease mismatch in conventional operational amplifiers (OPAMPs). Monte Carlo analysis verifies the reduction of mismatch. Furthermore, increasing the functionality of portable medical devices is also expected by clinicians and patients. High performance services require extra power suppling. Thus, Turbo-boost charger developed by Texas Instruments (TI) provides higher power delivery, but restricts the applications. Therefore, this dissertation also presents a new control topology of Turbo-boost charger named as the fully automatic control (FAC) technique, which can support any loading systems. Modeling from basic switching-based charger to the Turbo-boost charger is completely derived and analyzed.
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