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This work presents a low complexity dual band wireless narrowband transceiver with integrated PAs. The digital-centric transceiver is suitable for IEEE 802.15.4 (ZigBee etc.), 802.15.4g SUN, Bluetooth, especially Bluetooth Low Energy and the upcoming 802.11ah sub-GHz WLAN, to enable future internet-of-things applications. The output power for the low band (800 to 960MHz) is 24.7dBm at 53.9% efficiency...
This paper presents a straightforward top-down design methodology for frequency synthesizer systems, where the PLL noise shaping can be directly transformed from time-discrete domain to the event-driven phase domain. Compared to conventional PLL modeling methodologies, the PLL noise sources from various components and analog mismatch can be described both in abstract and behavior level. The simulation...
This paper presents an area-efficient ultra-low-power 32 kHz clock source for low power wireless communication systems using a temperature-compensated charge-pump-based digitally controlled oscillator (DCO). A highly efficient digital calibration method is proposed to achieve frequency stability over process variation and temperature drifts. This calibration method locks the DCO's output frequency...
This article discusses the synthesis and properties of dendritic and hyperbranched polyamides. The first part of the article focuses on peptide dendrimers and starts with providing an overview of the synthetic pathways that have been used to prepare dendrimers based on both natural and nonnatural amino acids. After that, the possible use of peptide dendrimers for medical and biological applications,...
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