Flexible and Self-adaptive Sense-and-Compress for sub-microWatt always-on sensory recording

© 2018 IEEE. Miniaturized sensory systems for IoT applications experience a severe power burden from their wireless link and/or embedded storage system. Compressive sensing techniques target data compression before storage and transmission to save power, while minimizing information loss. This work proposes a self-adaptive sense-and-compress system, which consumes only 45-884n W while continuously recording and compressing signals with a bandwidth up to 5kHz. The flexible system uses a combination of off-line Evolutionary Algorithms, and on-line self-adaptivity to constantly adapt to the incoming sensory data statistics, and the current application quality requirements. The 0.27mm2 sense-and-compress interface is integrated in a 65nm CMOS technology, together with an on-board temperature sensor, or can interface with any external sensor. The scalable, self-adaptive system is moreover heavily optimized for low-power and low-leakage, resulting in a tiny, efficient, yet flexible interface allowing always-on sensory monitoring, while consuming 2.5X less power compared to the current State-of-the-Art.status: publishe

A 62dB SFDR, 500MSPS, 15mW open-loop track-and-hold circuit

In this work, the design of an open-loop front-end track & hold (T&H) circuit is considered. Advantages of the presented circuit include low power-consumption, high-speed operation, simple reliable design, and ability to operate at low power-supplies. The major problem of open-loop circuits is their relatively poor linearity. In the presented design, high linearity is achieved by applying three linearization techniques: clock boosting (Abo and Gray, 1999), resistive source degeneration (Razavi, 2001), (Ouzounov et al., 2005) and cross-coupling (Ouzounov et al., 2005), (Voorman and Veenstra, 2000). As a result, a linearity corresponding to 10-bit accuracy is achieved. The final design in a 0.18mum CMOS process achieves an SFDR of 62 dB using a sample frequency of 500 MHz while consuming 15mW at a 1.8V power suppl

A gravure-printed organic TFT technology for active-matrix addressing applications

\u3cp\u3eIn this work is presented a gravure-printed unipolar Organic Thin-Film Transistor (OTFT) technology able to achieve state-of-the-art yield performance. A multilayer cross-linked dielectric is printed to reduce gate-leakage defects, which have been found to be one of the main failure mechanisms in previous printed OTFTs. The defectivity analysis performed at transistor level reveals 99.8% defect-free devices in a sample of 540 OTFTs, manufactured on 6 successive foils. A novel row driver circuit for matrix-addressing applications has been designed and fabricated using the improved technology. The experimental characterization of the proposed 8-stage row drivers reveals a circuit yield as high as 100%, over 15 samples in 5 successive foils, corresponding to a total number of 2085 fully functional OTFTs. The availability of a printed organic technology compatible with mass production is expected to enable innovative Internet of Things (IoT) applications characterized by extremely low production cost.\u3c/p\u3

A 2.4GHz ULP OOK single-chip transceiver for healthcare applications

Wireless body-area networks (WBAN) are used for communication among sensor nodes operating on, in or around the human body, e.g. for healthcare purposes. In view of energy autonomy, the total energy consumption of the sensor nodes should be minimized. Because of their low complexity, a combination of the super-regenerative (SR) principle [1-3] and OOK modulation enables ultra low power (ULP) consumption. This work presents a 2.4GHz ULP OOK single chip transceiver for WBAN applications. A block diagram of the implemented transceiver is shown in Fig. 26.3.1. Next to the direct modulation TX [4] and SR RF [5] front-ends, this work integrates analog and digital baseband, PLL functionality and additional programmability for flexible data rates, and achieves ultra-low power consumption for the overall system