Analogue and Discretes Smallest GPS receiver from SiTime/Telit

Analogue and Discretes Smallest GPS receiver from SiTime/Telit

2013/12/23

Telit and SiTime say they’ve made the the world’s smallest and lowest power GPS receiver with extended hibernation periods at 15µA while maintaining Snap Start to less than one second.

The receiver uses Telit’s Jupiter SE880 and SiTime’s MEMS SiT15xx oscillators.

SiTime’s devices claim to offer offer area savings of 85%, cut power by 50% and are 15 times more reliable, all of which enable smaller, lower power and longer lasting tracking and navigation devices together with Telit’s Jupiter SE880 miniature GPS receiver.

Battery powered electronic devices like trackers and personal navigation systems use hibernation techniques to extend battery life which entail shutting down the functional blocks with the highest current drain and switching them to the lowest power suspend/sleep state whenever possible. However, during the low-power state, the system’s always-ON 32 kHz Lo-clock continues to draw battery power.

The low 750 nA core current and unique power saving features of the 32 kHz SiT15xx family, such as programmable output frequency and output drive swing level, can dramatically lower system power consumption compared to traditional crystal clocks. Additionally, crystal clocks drift over time and over temperature requiring systems to wake up more frequently to correct system clocks and maintain systems in hot start conditions.

With ± 100 PPM over the entire industrial temperature range, SiT15xx devices are claimed to be 2 to 3 times more stable than crystal devices. This reduces the need for systems to wake up and further lowers power consumption. The SiT15xx family operates from 1.2V to 3.63V for regulated power supplies or from 2.7 to 4.5V for unregulated Li-Ion batteries. SiT15xx oscillators offer the smallest footprint in 1.5×0.8 mm chip-scale package (CSP) and eliminate the need for external capacitors.

Telit’s miniature 4.7×4.7mm LGA (Land Grid Array), SiRFstarIV-based Jupiter SE880 receiver module not only employs leading heterogeneous 3D integration technology, but also provides ways and means for utilizing the latest star products in the fast evolving TCXO and 32kHz technologies. This enables receiver designs that are best in class in performance and all other dimensions critical for regular or size-constrained GPS applications.

Its RF front-end employs spatially calibrated waveguide-quality radio paths inside the three-dimensional space of its architecture drastically reducing system noises and parasitic impedances characteristic of traditional 2-D RF designs.

Inside, a multi-filter system includes not only the traditional SAW filters typical in GPS receiver designs but also a 2.4 GHz notch-filter capable of nullifying the jamming effects of high-energy radio devices such as Wi-Fi hot-spots, Bluetooth systems, cordless phones, and others, which greatly affect a GPS receiver’s ability to resolve timid satellite signals in the hostile radio environment where they need to operate.

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