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 includes 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 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 collect a constrained crew of approximately a hundred those who are individually advancing the frontiers of analog circuit layout to brainstorm on new percentages and destiny advancements in a constrained variety of fields. they're focused round 3 themes. In each one subject six audio system provide an instructional presentation. Eighteen papers are therefore incorporated during this e-book. the themes of 1999 are: (X)DSL and different verbal exchange structures RF so much types built-in filters and oscillators the opposite issues, that have been coverd sooner than, are: 1992 Operational amplifiers A-D Converters Analog CAD 1993 Mixed-mode A+D layout Sensor interfaces conversation circuits 1994 Low-power low-voltage layout built-in filters shrewdpermanent 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 info 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 energy amplifiers for telecommunications

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Extra resources for Analog Circuit Design: (X)DSL and other Communication Systems; RF MOST Models; Integrated Filters and Oscillators

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Echo-canceling-based modems with their overlapping bands, by definition, cannot comply. The reduced NEXT psd mask is important primarily to pseudo-FDD-based modems where the band splitting filters alone may not be adequate to prevent NEXT corruption of adjacent loop upstream performance. D. ADDITIONAL PSD SHAPING FOR FDD While the psd shaping in echo-canceling modems need only comply with the requirements of the standard, the FDD modem operation requires additional psd shaping constraints. At each end of the connection, the transmitter psd must be shaped such that its echo psd, when referred to the loop, is no greater than the loop noise psd within the band of the receiver.

D ' Real(r(f» - -k· d . --- . •. 1,,. ~~+-+-+ . ~,~~~, ........ 'Ooal (26A WG) II~ ........ " Twisted pairs Characteristics loop impairments (l12) • T Thermal Noise: -140 dBm/Hz T Crosstalk (NEXT & FEXT) ~ ~ Coupling between wires in same and adiacent binders • Twisting mandatory Self-NEXT .. , J- /""' I"YilA \ 0". ~ I : .... 'M, I yV fAl.. f\ { (, -- 29 ,. H······ • Twisted pairs Characteristics Loop impairments (2/2) ~Bridged taps and gauge transitions Q Reflection: Impedance ripple QEcho .

The ideal hybrid gain should be programmable so that as much gain as possible can be applied as early as possible in the receiver path. However, for the purposes of discussing the receiver architecture and avoiding the tedium of power level bookkeeping, we will assume a fixed, frequencyindependent net signal gain from the loop to the CODEC of -12dB at both the central office and the remote terminal. 5Vpp, a level compatible with modem mixed-signal integrated circuit technology. 60 10 Downstream Echo o -10 -20 -30 2500 5000 7500 10000 12500 15000 17500 (A) Central Office 10~~1::::R::-____ O~----~~~----------------~&re~bct~---­ -10 Downstream E-C Signal -20 -30 -40 -50 2500 5000 7500 10000 12500 15000 17500 (B) Remote Terminal Figure 6.

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