A 1.08-nW/kHz 13.2-ppm/degrees C Self-Biased Timer Using Temperature-Insensitive Resistive Current

作者：Jung Jaehong; Kim Ik Hwan; Kim Seong Jin; Lee Yoonmyung; Chun Jung Hoon^*

来源：IEEE Journal of Solid-State Circuits, 2018, 53(8): 2311-2318.

DOI：10.1109/JSSC.2018.2824307

• Allan deviation
• low power
• oscillators
• RC-time constant
• temperature sensitivity
• wake-up timer

This paper proposes a 32.7 kHz self-biased wake-up timer using temperature-insensitive resistive current. A dual-loop structure with supply-regulation loop and frequency-locked loop determines the regulated voltages at both ends of a temperature-compensated resistor and cancels out the amplifier offset voltages, thus generating temperature-insensitive resistive current for the switched capacitor. Moreover, a self-biasing scheme in low-power design reduces the power variation across the temperature range and eliminates the necessity of a sub-mu A reference current generator. The proposed timer with its start-up circuit generates <12 ms lock time, which is 20 times less than what obtained without a start-up circuit, and exhibits a long-term frequency stability of 10 ppm and a temperature coefficient of 13.2 ppm/degrees C with an energy efficiency of 1.08 nW/kHz.

• 出版日期2018-8