Publication

PLL-Free, High Data Rate Capable Frequency Synthesizers

Christian Enz
2016

Abstract

The PLL based frequency synthesizer has been the main impediment to achieve a low energy dissipation in the radios employed in Wireless Sensor Networks (WSN); in spite of duty cycling. This is due to the crystal oscillator reference in the frequency synthesizer which dissipates significant energy during its long wakeup phase. To address this issue and thereby obtain the full advantage proffered by duty cycling, an overview of FBAR based synthesizers which can wake up in just 5 μs is presented. In addition, these synthesizers can also support high data rates as compared to the PLL based radios, thereby offering the possibility to increase the rate of duty cycling and thus further lowering the average energy dissipation.

Official source

https://infoscience.epfl.ch/entities/publication/2ed5ac6a-ff99-4f14-bcb3-55ad3745a0f1

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Christian Enz
2016

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/2ed5ac6a-ff99-4f14-bcb3-55ad3745a0f1

About this result

Related concepts (31)

Frequency synthesizer

A frequency synthesizer is an electronic circuit that generates a range of frequencies from a single reference frequency. Frequency synthesizers are used in many modern devices such as radio receivers, televisions, mobile telephones, radiotelephones, walkie-talkies, CB radios, cable television converter boxes, satellite receivers, and GPS systems. A frequency synthesizer may use the techniques of frequency multiplication, frequency division, direct digital synthesis, frequency mixing, and phase-locked loops to generate its frequencies.

Synthesizer

A synthesizer (also spelled synthesiser) is an electronic musical instrument that generates audio signals. Synthesizers typically create sounds by generating waveforms through methods including subtractive synthesis, additive synthesis and frequency modulation synthesis. These sounds may be altered by components such as filters, which cut or boost frequencies; envelopes, which control articulation, or how notes begin and end; and low-frequency oscillators, which modulate parameters such as pitch, volume, or filter characteristics affecting timbre.

Phase-locked loop

A phase-locked loop or phase lock loop (PLL) is a control system that generates an output signal whose phase is related to the phase of an input signal. There are several different types; the simplest is an electronic circuit consisting of a variable frequency oscillator and a phase detector in a feedback loop. The oscillator's frequency and phase are controlled proportionally by an applied voltage, hence the term voltage-controlled oscillator (VCO).