Abstract
Abstract—A transmitter pre-emphasis technique for copper
cable equalization is presented that is based on pulse-width
modulation (PWM). This technique is an alternative to the usual
2-tap symbol-spaced FIR (SSF) pre-emphasis. The technique
uses timing resolution instead of amplitude resolution to adjust
the filter transfer function, and therefore fits well with future
high-speed low-voltage CMOS processes. Spectral analysis and
time domain simulations illustrate that PWM pre-emphasis offers
more relative high frequency boost than 2-tap SSF. Only one coefficient
needs to be set to fit the equalizer transfer function to the
channel, which makes convergence of an algorithm for automatic
adaptation straightforward. A proof-of-concept 0.13- m CMOS
transmitter achieves in excess of 5 Gb/s (2-PAM) over 25 m of
standard RG-58U low-end coaxial copper cable with 33 dB of
channel loss at the Nyquist frequency (2.5 GHz). Measured BER
at this speed and channel loss is 10 12.
Original language | English |
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Pages (from-to) | 990-999 |
Number of pages | 9 |
Journal | IEEE journal of solid-state circuits |
Volume | 41 |
Issue number | 2/4 |
DOIs | |
Publication status | Published - 1 Apr 2006 |
Keywords
- wire communication
- EWI-3694
- pulse-width modulation
- transmit pre-shaping
- transmit pre-emphasis
- transceivers
- equalizers
- ICD-MULTI-CHIP X-RAY IMAGER WITH HIGH BANDWIDTH SERIAL READOUT
- Copper
- CMOS integrated circuits
- IR-57308
- METIS-238052