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A 400 fJ per-cycle frequency reference for internet of things

Coustans M., Krummenacher F., Terrier C., Kayal M.

International Journal of Microelectronics and Computer Science

2016

Vol. 7, nr 2

41--46

This work presents an ultra-low power oscillator designed to target different contexts, such as crystal-assisted timekeeping, reference oscillator to optimize the always on domain of a microcontroller or wake-up timer. This oscillator enables ultralow power operation in 0.18 μm CMOS technology; the core oscillator consumes 2.5 nW at room temperature, with a temperature stability of 14 ppm/°C [-40°C - 60°C] and 0.07 %/V supply sensitivity.

The problem of compatibility and interoperability of Satellite Navigation Systems in computation of user’s position

Januszewski J.

Artificial Satellites : Journal of Planetary Geodesy

2011

Vol. 46, No. 3

93--102

Actually (June 2011) more than 60 operational GPS and GLONASS (Satellite Navigation Systems - SNS), EGNOS, MSAS and WAAS (Satellite Based Augmentation Systems – SBAS) satellites are in orbits transmitting a variety of signals on multiple frequencies. All these satellite signals and different services designed for the users must be compatible and open signals and services should also be interoperable to the maximum extent possible. Interoperability definition addresses signal, system time and geodetic reference frame considerations. The part of compatibility and interoperability of all these systems and additionally several systems under construction as Compass, Galileo, GAGAN, SDCM or QZSS in computation user’s position is presented in this paper. Three parameters - signal in space, system time and coordinate reference frame were taken into account in particular.