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This paper presents a low start-up latency Transmitter (TX) that can achieve FSK data rates of upto 51.4 Mb/s for deployment in duty cycled microsensor nodes. Utilizing a Phase Domain Digital Synthesizer with an FBAR frequency reference, this TX has a start-up latency of just 1.5 µs. It has been integrated in a 65nm technology and outputs upto 3 dBm power. It achieves a phase noise of −110 dBc/Hz...
Energy wasted during the wake-up of radios significantly degrades the efficiency of duty-cycled Wireless Sensor Networks (WSN). The major contributor to this energy wastage is the PLL-based frequency synthesizer which has a long wakeup time. Furthermore, the rate of duty cycling in these radios is also constrained by the PLL which imposes an upper limit on the maximum data rate that can be achieved...
A 2.4 GHz polar transmitter compliant with the IEEE 802.15.6 standard is presented in this paper. A Linearized class-C power amplifier, employing dynamic biasing is used to minimize the adjacent channel interference and satisfy the defined spectrum mask requirements. An FBAR based frequency synthesizer enables fast startup and channel switching times. It is capable of addressing all the channels within...
The energy dissipated by conventional phase-locked-loop-based transmitters (TXs) during the long startup phase is a major bottleneck that reduces the energy autonomy of duty-cycled ultra-low-power systems. In order to tackle this problem, this paper presents a loop-free TX based on a film-bulk acoustic wave resonator (FBAR) that has a 5-s startup time and requires just 3-s for channel switching...
A sub-sampling RF front end which exploits the intrinsically high quality factor of MEMS devices for performing channel filtering directly at RF is proposed in this work. This narrow band filtering at RF also acts as a good anti-aliasing filter to support down-conversion by sub-sampling. The RF front end employs current reuse for amplification, mixing and filtering. A low phase noise BAW based DCO...
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