A high performance QAM receiver for digital cable TV with integrated A/D and FEC decoder

A DVB-C/ITU J.83-A compliant QAM (quadrature amplitude modulation) demodulator suitable for digital cable TV is proposed, which can support 4-256QAM with variable bit rate up to 80Mbps. It integrates a 10-bit 40MSPS ADC, (204,188) Reed-Solomon decoder as well as a convolutional interleaver. The chip is implemented in SMIC 0.25/spl mu/m CMOS technology with die size of 3.5/spl times/3.5 mm/sup 2/. It features wide carrier offset acquisition range, robust demodulation algorithm and small circuit area.