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Choi, Woojun,Lee, Yongtae,Kim, Seonhong,Lee, Sanghoon,Jang, Jieun,Chun, Junhyun,Makinwa, Kofi A. A.,Chae, Youngcheol IEEE 2018 IEEE journal of solid-state circuits Vol.53 No.12
<P>This paper presents a compact resistor-based CMOS temperature sensor intended for dense thermal monitoring. It is based on an <TEX>$RC$</TEX> poly-phase filter (PPF), whose temperature-dependent phase shift is read out by a frequency-locked loop (FLL). The PPF’s phase shift is determined by a zero-crossing (ZC) detector, allowing the rest of the FLL to be realized in an area-efficient manner. Implemented in a 65-nm CMOS technology, the sensor occupies only 7000 <TEX>$\mu \text{m}~^{\mathrm{ 2}}$</TEX>. It can operate from supply voltages as low as 0.85 V and consumes 68 <TEX>$\mu \text{W}$</TEX>. A sensor based on a PPF made from silicided p-poly resistors and metal–insulator–metal (MIM) capacitors achieves an inaccuracy of ±0.12 °C (3 <TEX>$\sigma $</TEX>) from −40 °Cto 85 °C and a resolution of 2.5 mK (rms) in a 1-ms conversion time. This corresponds to a resolution figure-of-merit (FoM) of 0.43 pJ <TEX>$\cdot \text{K}~^{\mathrm{ 2}}$</TEX>.</P>