Download Analog Circuit Design: (X)DSL and other Communication by Jean-Philippe Cornil (auth.), Willy Sansen, Johan Huijsing, PDF

By Jean-Philippe Cornil (auth.), Willy Sansen, Johan Huijsing, Rudy van de Plassche (eds.)

This new publication on Analog Circuit layout comprises the revised contributions of all of the instructional audio system of the 8 workshop AACD (Advances in Analog Circuit Design), which used to be held at great, France on March 23-25, 1999. The workshop was once geared up through Yves Leduc of TI great, France. this system committee consisted of Willy Sansen, K.U.Leuven, Belgium, Han Huijsing, T.U.Delft, The Netherlands and Rudy van de Plassche, T.U.Eindhoven, The Netherlands. the purpose of those AACD workshops is to collect a constrained crew of approximately a hundred people who find themselves in my opinion advancing the frontiers of analog circuit layout to brainstorm on new probabilities and destiny advancements in a constrained variety of fields. they're focused round 3 themes. In every one subject six audio system supply an instructional presentation. Eighteen papers are hence integrated during this publication. the subjects of 1999 are: (X)DSL and different verbal exchange platforms RF so much versions built-in filters and oscillators the opposite themes, that have been coverd sooner than, are: 1992 Operational amplifiers A-D Converters Analog CAD 1993 Mixed-mode A+D layout Sensor interfaces verbal exchange circuits 1994 Low-power low-voltage layout built-in filters clever strength 1995 Low-noise low-power low-voltge layout Mixed-mode layout with CAD instruments Voltage, present and time references vii viii 1996 RF CMOS circuit layout Bandpass sigma-delta and different information converters Translinear circuits 1997 RF A-D Converters Sensor and actuator interfaces Low-noise oscillators, PLL's and synthesizers 1998 I-Volt electronics layout and implementation of mixed-mode platforms Low-noise amplifiers and RF energy amplifiers for telecommunications

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R"ft" . ,) '00 _"..... 150 ,.. nc. 1 PMDLavcr Digital .. AnalOI l Building the modem FFT/IFFT • T (De)Modulator : Fast Fourier Transform (FFT) Q Q Q The FFT is an easy way to compute the time domain signal from the constellation points on all tones simultoneously. 3125 KSymbol/s SIN uJs - ... I COSuls 38 ,. """'" Dirital _. ,. 'Quality' control Q Q SNR (size of the clouds) • Bit swaps Noise measurements ... Timing recovery 'Pilot' tracking DPLL controls: 1}••• Digital Rotor Q £j5 Q .. .

Outside the pass-bands, the psd limits decrease at rates determined to minimize ADSL impairments to other telephone company services. We should note that figure 3 does not quite represent the standard. The minimum peak psd in the standard is -90dBmlHz, but the figure indicates otherwise above 3093kHz downstream and 1221kHz upstream. The figure represents an overly conservative interpretation of the fact that the average psd (lMHz bandwidth) may not exceed -llOdBmlHz at frequencies above 4545kHz downstream and 1630kHz upstream.

SNR. (f)'tf /. , Due 10 its fine frequency granularity, DMT approaches theorelicallimit very closely. Wideband ... Upstream placed at lower frequency with or without overlap (FDM) TEe vs FDM ~ ~ ~ Lower Upstream, Higher Downstream capacity (Self-NEXT/Bandwidth) More DSP intensive Simple d iscrete AFE, more analog dynamic range 31 •r " ••••• Signal Description ADSL DMT Spectrum unused tones due to line conditions power spectrum tone spaci,,!! 3125 kHzI ~L~ I QAM·modulate

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