A 500 pW 16 KHz Injection Locked Oscillator for Ultra-Low Power Time-Domain ADC Application

Goux, Nicolas; Dina, E.; Badets, Franck

doi:10.1109/newcas.2018.8585520

Cited by 2 publications

(1 citation statement)

References 7 publications

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“…Figure 6(a) illustrates the current-to-frequency oscillator modified from the inverter-based current-to-frequency oscillator. 33) Here, two OP amps are used to accurately switch the SR latch when Vc1 and Vc2 are charged from 0 to V ref , alternatively. In order to synchronize the two current-to-frequency oscillators starting to oscillate at the same time, the signal Enable is added in the SR latch using a NAND gate and a NOR gate as shown in Fig.…”

Section: Current-to-frequency Oscillatorsmentioning

confidence: 99%

An area-efficient sub-10 nW temperature-to-digital converter for thermopile temperature sensors

Lee

Lin

Lai

2023

Jpn. J. Appl. Phys.

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A 6.29 nW temperature-to-digital converter for infrared (IR) radiation-based thermopile temperature sensors was designed and fabricated on the chip area of 0.068 mm^2 using the 90 nm CMOS technology. The sub-mV voltage produced by the sensor nearly proportional to the temperature difference between the object and the environment is converted to sub-nA current using the gate-leakage characteristics of PMOS transistors. The ratio of the sub-nA current and the reference current proportional to the sub-mV voltage difference is converted to the frequency ratio of the two current-to-frequency oscillators. Then, the digital output proportional to the tiny voltage difference can be obtained by the counters. After the two-point calibrated digital outputs are mapped to the object temperatures, the average resolution is 0.11ºC with the conversion time of 348 ms, which results in the figure of merit (FoM) of 0.026 nJ×ºC^2. The inaccuracy is +0.18/-0.98ºC for the object temperatures from -10ºC to 100ºC at the ambient temperature of 25ºC.

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Section: Current-to-frequency Oscillatorsmentioning

confidence: 99%