Title :
QAM/VSB dual mode equalizer design and implementation
Author :
Wu, C.E. ; Shiue, M.-T. ; Huang, C.C. ; Jou, S.J.
Author_Institution :
Nat. Central Univ., Chung-Li, Taiwan
fDate :
6/21/1905 12:00:00 AM
Abstract :
A novel architecture for dual mode equalizer of CATV modem is proposed. It is not only suitable for quadrature amplitude modulation (QAM) system but also suitable for vestigial sideband modulation (VSB) system. This dual mode equalizer consists of fractionally spaced equalizer (FSE) and decision feedback equalizer (DFE) architecture. The FSE has 12 taps filter and uses sign-delayed LMS (SDLMS) coefficients updating methodology with “stop-and-go” algorithm. The DFE has 13 taps filter and uses sign-delayed LMS coefficients updating methodology. Also, a multi-state control scheme, a multi-slice slicer and a multi-step size are used to speed up the convergence of system. The system data rate is 5 MBaud and the maximum internal operation clock of the equalizer is 102 MHz. The chip is implemented with 0.6 μm CMOS TSMC 1P3M technology. The core area is 4044 μm×4044 μm and consumes 1.938 W power consumption
Keywords :
CMOS digital integrated circuits; cable television; decision feedback equalisers; least mean squares methods; modems; quadrature amplitude modulation; 0.6 micron; 1.938 W; 102 MHz; 5 Mbit/s; CATV modem; CMOS TSMC 1P3M technology; QAM/VSB; coefficients updating methodology; core area; decision feedback equalizer; dual mode equalizer; equalizer design; fractionally spaced equalizer; maximum internal operation clock; multi-slice slicer; multi-state control scheme; multi-step size; power consumption; sign-delayed LMS; system data rate; vestigial sideband modulation; Amplitude modulation; CMOS technology; Clocks; Control systems; Decision feedback equalizers; Filters; Least squares approximation; Modems; Quadrature amplitude modulation; Size control;
Conference_Titel :
ASICs, 1999. AP-ASIC '99. The First IEEE Asia Pacific Conference on
Conference_Location :
Seoul
Print_ISBN :
0-7803-5705-1
DOI :
10.1109/APASIC.1999.824094
