A crystal-less bluetooth low energy radio using a MEMS-based frequency reference system
A system clock is implemented with a 2.52 GHz MEMS-based oscillator, divider, temperature sensor, digital PLL, and active temperature compensation to generate a 48 MHz frequency reference with ±10 ppm stability from -40°C to 105°C. An on-chip 32 kHz RC oscillator is also periodically calibrated by t...
Saved in:
Published in | 2017 Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS) pp. 181 - 184 |
---|---|
Main Authors | , , , , , |
Format | Conference Proceeding |
Language | English |
Published |
IEEE
01.07.2017
|
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | A system clock is implemented with a 2.52 GHz MEMS-based oscillator, divider, temperature sensor, digital PLL, and active temperature compensation to generate a 48 MHz frequency reference with ±10 ppm stability from -40°C to 105°C. An on-chip 32 kHz RC oscillator is also periodically calibrated by this reference clock to achieve ±500 ppm accuracy, allowing it to be used as the wireless node sleep timer. Additionally, the MEMS oscillator is advantaged in highly duty cycled protocols due to its 100× faster start-up time. This fully integrated reference system enables a crystal-less Bluetooth Low Energy compliant radio in 65 nm CMOS and could provide on-board design convenience to end users. |
---|---|
ISSN: | 2327-1949 |
DOI: | 10.1109/FCS.2017.8088840 |