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

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

This new ebook on Analog Circuit layout includes the revised contributions of the entire instructional audio system of the 8 workshop AACD (Advances in Analog Circuit Design), which was once held at great, France on March 23-25, 1999. The workshop was once prepared by means of 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 assemble a limited crew of approximately a hundred those who are for my part advancing the frontiers of analog circuit layout to brainstorm on new probabilities and destiny advancements in a limited variety of fields. they're focused round 3 subject matters. In each one subject six audio system supply an educational presentation. Eighteen papers are therefore integrated during this booklet. the themes of 1999 are: (X)DSL and different verbal exchange platforms RF such a lot types built-in filters and oscillators the opposite themes, that have been coverd prior to, are: 1992 Operational amplifiers A-D Converters Analog CAD 1993 Mixed-mode A+D layout Sensor interfaces communique circuits 1994 Low-power low-voltage layout built-in filters clever energy 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 structures Low-noise amplifiers and RF strength amplifiers for telecommunications

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LS - 1 ms) ~RFI interference Q AM & amateur radio Q Ingress & egress ~POTS signaling (Ringing, on/off hook) "'Loading coils Q Not allowed I ,. , • • Signal Description Modulation: "Divide to conquer" • T The challenge: Survive the loop impairements ! 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,,!!

24 ........ Introduction Evolution of Twisted Pair Capacity • . ~I~------~------~----~-------+-------+------~------~ '''' - ,. ..... Introduction Evolution of the Local Loop • t OJ e \"';l"',. e ~,," . ~ . ".... - ... ,.. 25 Introduction Evolution of the Modem Concept Voice-band modem - ... " • _. Introduction ADSl Spectrum Allocation _. 26 ..... ~ Outline • T Introduction T Twisted pair characteristics T Signal Description T Building the modem T Conclusions ....... r. 5kft on 26AWG ~ 90% of all US customer l~r_+-~~~~--r-+-;-~ I "I--t----l'//'---t--;--t--f-+--j !

JHz, measured at the hybrid output. 9JlV least significant bit converting at a 4416kS/sec rate. 4 effective bits of resolution converting at 4416kS/sec is required. While building such an ADC is within the realm of possibility, it is highly desirable to configure the receiver to relax this specification. Reducing the ADC resolution requires programmable gain amplifiers and strategic filtering, but there is a limit. 5 effective bits is the minimum ADC resolution that supports 15b/symbol. In reality, the ADC dynamic range must be greater than this so that there is some headroom for the echo.

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