A 0.84pJ/cycle Wheatstone Bridge Based CMOS RC Oscillator with Reconfigurable Frequencies

被引：23

作者：

Chen, Peiyu ^{[1
]}

Li, Dai ^{[1
]}

Yu, Zhanghao ^{[1
]}

Jin, Qing ^{[2
]}

Yang, Kaiyuan ^{[1
]}

机构：

[1] Rice Univ, Dept Elect & Comp Engn, POB 1892, Houston, TX 77251 USA

[2] Xi An Jiao Tong Univ, Xian, Shaanxi, Peoples R China

来源：

2019 IEEE CUSTOM INTEGRATED CIRCUITS CONFERENCE (CICC) | 2019年

关键词：

CMOS; low power; RC oscillator; relaxation oscillator; frequency lock-loop; Wheatstone Bridge;

D O I：

10.1109/CICC.2019.8780148

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 low-power CMOS RC relaxation oscillator supporting reconfigurable frequencies is presented for timekeeping in low-power Internet of Things (loT) devices. The oscillator employs a Wheatstone Bridge (W13) scheme to relax the constraint between reference current and reference resistance existing in prior arts. In addition, adjusting the resistor ratios in WB supports reconfigurable frequencies and allows the use of smaller resistors for lower frequencies, saving chip area. Measurements of the prototype in 180nm CMOS show an average temperature coefficient down to 9.6ppurire at nominal 67kHz across-20 C to 100 C, with an energy efficiency of 0.84pJfexcle and an actise area of OH 45mm2. Oscillations at 17kHz and 154kHz are also demonstrated by tuning the resistor ratio of WB.

引用

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