Title :
A 150nW, 5ppm/o C, 100kHz On-Chip clock source for ultra low power SoCs
Author :
Shrivastava, Aatmesh ; Calhoun, Benton H.
Author_Institution :
Univ. of Virginia, Charlottesville, VA, USA
Abstract :
This paper presents an ultra low power clock source using a 1μW temperature compensated on-chip digitally controlled oscillator (OscCMP) and a 100nW uncompensated oscillator (OscUCMP) with respective temperature stabilities of 5ppm/°C and 1.67%/°C. A fast locking circuit re-locks OscUCMP to OscCMP often enough to achieve a high effective temperature stability. Measurements of a 130nm CMOS chip show that this combination gives a stability of 5ppm/°C from 20°C to 40°C (14ppm/°C from 20°C to 70°C) at 150nW if temperature changes by 1°C or less every second. This result is 7X lower power than typical XTALs and 6X more stable than prior on-chip solutions.
Keywords :
CMOS integrated circuits; clocks; compensation; crystal oscillators; low-power electronics; system-on-chip; temperature; thermal stability; CMOS chip; OscUCMP; XTAL; crystal oscillator; fast locking circuit; frequency 100 kHz; on-chip clock source; on-chip digitally controlled oscillator; power 1 muW; power 150 nW; size 130 nm; temperature 20 C to 70 C; temperature compensation; temperature stability; ultra low power SoC; ultra low power clock source; uncompensated oscillator; Circuit stability; Clocks; Oscillators; Power system stability; System-on-a-chip; Temperature measurement; Thermal stability;
Conference_Titel :
Custom Integrated Circuits Conference (CICC), 2012 IEEE
Conference_Location :
San Jose, CA
Print_ISBN :
978-1-4673-1555-5
Electronic_ISBN :
0886-5930
DOI :
10.1109/CICC.2012.6330699
