Publication

Multistandard carrier generation system for quad-band GSM/WCDMA (FDD-TDD)/WLAN (802.11 a-b-g) radio

Adil Koukab
2006
Conference Papers

Abstract

A compact carrier generation system enabling proper interoperability among quad-band GSM, WCDMA (FDD and TDD) and WLAN (802.11a/b/g) standard is developed. The implementation is achieved in 0.25μm BiCMOS-SiGe process. The measured tuning range is higher than 1GHz (3.05GHz to 4.1 GHz) exceeding by 25% the specifications. The VCO exhibits a phase noise of -118 and -125 dBc/Hz measured respectively at 400KHz and 1MHz offsets while drawing only 2.5 mA from 2.5 V supply. The measured phase noise at 400 KHz offset from the PCS 1900/DCS1800 and the GSM850/900 carriers are respectively -124 dBc/Hz and -130dBc/Hz.

Official source

https://infoscience.epfl.ch/entities/publication/4b566456-cfbc-463e-8f7b-d7294c6f67fb

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Adil Koukab
2006
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/4b566456-cfbc-463e-8f7b-d7294c6f67fb

About this result

Related concepts (31)

Phase noise

In signal processing, phase noise is the frequency-domain representation of random fluctuations in the phase of a waveform, corresponding to time-domain deviations from perfect periodicity (jitter). Generally speaking, radio-frequency engineers speak of the phase noise of an oscillator, whereas digital-system engineers work with the jitter of a clock. Historically there have been two conflicting yet widely used definitions for phase noise.

Colors of noise

In audio engineering, electronics, physics, and many other fields, the color of noise or noise spectrum refers to the power spectrum of a noise signal (a signal produced by a stochastic process). Different colors of noise have significantly different properties. For example, as audio signals they will sound differently to human ears, and as they will have a visibly different texture. Therefore, each application typically requires noise of a specific color.

Carrier-to-noise ratio

In telecommunications, the carrier-to-noise ratio, often written CNR or C/N, is the signal-to-noise ratio (SNR) of a modulated signal. The term is used to distinguish the CNR of the radio frequency passband signal from the SNR of an analog base band message signal after demodulation. For example, with FM radio, the strength of the 100 MHz carrier with modulations would be considered for CNR, whereas the audio frequency analogue message signal would be for SNR; in each case, compared to the apparent noise.

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