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该论文提出了一种基于双RC结构的频率参考电路，通过结合具有互补温度系数的电阻实现一阶温度补偿，在0.9V供电下达到28MHz输出频率，能量效率为5pJ/cycle，并在-40°C至85°C范围内实现了±200ppm的频率精度，解决了传统RC频率参考因片上电阻温度系数大导致精度低的问题。
applications require a stable on-chip frequency reference with low energy (<10pJ/cycle) and high frequency stability (below ±300ppm). CMOS RC frequency references are promising due to their low-cost integration and high energy efficiency [1-5]. Conventional RC references, however, achieve only moderate accuracy (a few %) due to the large temperature coefficient (TC) of on-chip resistors [3]. First-order TC compensation can be achieved by combining resistors with complementary TCs [1,2]. Although this is energy efficient (<6pJ/cycle), it only partially compensates for the resistors’ high-order TCs, limiting the resulting accuracy to about ±500ppm. Better accuracy (±100ppm [4]) can be achieved by using the output of a digital temperature sensor (TS) to perform a polynomial
Woojun Choi1, Jan A. Angevare2, Injun Park1, Kofi A. A. Makinwa2, Youngcheol Chae1
Yonsei University, Seoul, Korea Delft University of Technology, Delft, The Netherlands 1 2 Wireless sensor nodes in battery-powered internet-of-things (IoT)