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
| Autor: | Ding, Ming, Liu, Yao Hong, Zhang, Yan, Lu, Chuang, Zhang, Peng, Busze, Benjamin, Bachmann, Christian, Philips, Kathleen, Fujino, Laura C. |
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| Přispěvatelé: | Signal Processing Systems |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | 2017 IEEE International Solid-State Circuits Conference, ISSCC 2017, 90-91 STARTPAGE=90;ENDPAGE=91;TITLE=2017 IEEE International Solid-State Circuits Conference, ISSCC 2017 |
| Popis: | 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). |
| Databáze: | OpenAIRE |
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