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This paper presents a high accuracy and fast hybrid on-chip temperature sensor. The proposed temperature sensor combines a SAR type temperature sensor with a ΣΔ type temperature sensor. The SAR type temperature sensor has fast temperature searching time but it has more error than the ΣΔ type temperature sensor. The ΣΔ type temperature sensor is accurate but it is slower than the SAR type temperature sensor. The proposed temperature sensor uses both the SAR and ΣΔ type temperature sensors, so that the proposed temperature sensor has high accuracy and fast temperature searching. Also, the proposed temperature sensor includes a temperature error compensating circuit by storing the temperature errors in a memory circuit after chip fabrication. The proposed temperature sensor was fabricated in 3.3V CMOS 0.35μm process. Its temperature resolution, power consumption, and area are 0.15℃, 540μW, and 1.2  , respectively.키워드 : 온도센서, 혼합형, SAR, ΣΔ

In this paper, a small areal dual-output SC(switched capacitor) DC-DC converter with a improved range of an input voltage is presented. The conventional SC DC-DC converter has an advantage of low cost and small chip area. But, it has a narrow input voltage range to convert efficiently. Also, it has a lager chip area and a lower power efficiency from multiple outputs. The proposed SC DC-DC converter improves the power efficiency by using the capacitor array structure which efficiently converts the voltage according to the input voltage. By sharing two switch array, it reduces the number of switches and capacitors from 32 to 25. The proposed SC DC-DC converter was manufactured in a 0.18µm CMOS process. In the simulation, the range of the input voltage is 0.7~ 1.8V, the max. power efficiency is 90%, and the chip area is 0.255mm 2 .

This paper proposed hybrid converter to operate over a wide output load power. The switched-capacitor converter has a high efficiency at low load power and a low efficiency at high load power. On the contrary, the buck converter has a high efficiency at high load power and a low efficiency at low load power. The proposed hybrid converter has combination of the switched-capacitor converter and the buck converter. The switched-capacitor operates at low load power and buck converter operates at high load power, so that the hybrid converter is improved power efficiency at wide output load power. The hybrid converter was implemented with a 0.18μm CMOS process. The hybrid converter has a range of the load power between 50μW and 100mW. The maximum power efficiencies are 93% and 77% at the buck converter and the switched-capacitor converter, respectively