A 95µW 24MHz digitally controlled crystal oscillator for IoT applications with 36nJ start-up energy and >13× start-up time reduction using a fully-autonomous dynamically-adjusted load

Ming Ding, Yao Hong Liu, Yan Zhang, Chuang Lu, Peng Zhang, Benjamin Busze, Christian Bachmann, Kathleen Philips

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

17 Citations (Scopus)

Abstract

Wireless sensor nodes (WSN) in IoT applications (e.g., Bluetooth Low Energy, BLE) rely on heavily duty-cycling the wireless transceivers to reduce the overall system power consumption [1]. This requires swift start-up behavior of the transceiver. The crystal oscillator (XO) generates a stable reference clock for the PLL to synthesize a carrier and to derive clocks for all other parts of the transceiver SoC, e.g., ADC and the digital baseband. The typical start-up time (Ts) of an XO is relatively long (∼ms) due to a high quality factor of the crystal quartz. This leads to a significant (up to 30%) power overhead for a highly duty-cycled transceiver with a short packet format, e.g., the packet length is as short as 128μs in BLE (Fig. 5.3.1). A reduction of Ts of the XO is necessary, at the same time, the power overhead to enable a fast start-up should be minimized in order to reduce the overall energy consumption (Fig. 5.3.1).

Original languageEnglish
Title of host publication2017 IEEE International Solid-State Circuits Conference, ISSCC 2017
EditorsLaura C. Fujino
Place of PublicationPiscataway
PublisherInstitute of Electrical and Electronics Engineers
Pages90-91
Number of pages3
ISBN (Electronic)9781509037575
DOIs
Publication statusPublished - 2 Mar 2017
Event64th IEEE International Solid-State Circuits Conference (ISSCC 2017) - San Francisco, United States
Duration: 5 Feb 20179 Feb 2017
Conference number: 61

Conference

Conference64th IEEE International Solid-State Circuits Conference (ISSCC 2017)
Abbreviated titleISSCC 2017
Country/TerritoryUnited States
CitySan Francisco
Period5/02/179/02/17

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