An RC Oscillator With Comparator Offset Cancellation

被引：99

作者：

Paidimarri, Arun ^{[1
]}

Griffith, Danielle ^{[2
]}

Wang, Alice ^{[3
]}

Burra, Gangadhar ^{[4
]}

Chandrakasan, Anantha P. ^{[1
]}

机构：

[1] MIT, 77 Massachusetts Ave, Cambridge, MA 02139 USA

[2] Texas Instruments Inc, Dallas, TX 75243 USA

[3] Mediatek, Hsinchu 300, Taiwan

[4] Qualcomm, San Jose, CA 95110 USA

来源：

IEEE JOURNAL OF SOLID-STATE CIRCUITS | 2016年 / 51卷 / 08期

关键词：

Allan deviation; Allan variance; crystal replacement; guard time; offset cancellation; RC oscillator; Schmitt trigger; startup time; temperature stability; timing accuracy; ACHIEVABLE PHASE NOISE; CMOS;

D O I：

10.1109/JSSC.2016.2559508

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A fully-integrated 18.5 kHz RC time-constant-based oscillator is designed in 65 nm CMOS for sleep-mode timers in wireless sensors. A comparator offset cancellation scheme achieves 4x to 25x temperature stability improvement, leading to an accuracy of +/- 0.18% to +/- 0.55% over -40 to 90 degrees C. Subthreshold operation and low-swing oscillations result in ultra-low power consumption of 130 nW. The architecture also provides timing noise suppression, leading to 10x reduction in long-term Allan deviation. It is measured to have a stability of 20 ppm or better for measurement intervals over 0.5 s. The oscillator also has a fast startup-time, with the period settling in 4 cycles.

引用

页码：1866 / 1877

页数：12

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