Samsung Electronics will publish some details on their 80nm 512Mb GDDR4 SDRAM running at 2GHz frequency with max data rate of 4Gbps/pin at ISSCC. In comparison, the fastest commercially available Samsung GDDR4 memories clocked at 1.4GHz while ATi Radeon X1950XTX runs at 1GHz and ATi R600 is rumored to run at 1.1GHz. To save power and lower noise, it employs a data-bus inversion coding scheme with an analog majority voter insensitive to mismatch, which reduces peak-to-peak jitter by 21ps and voltage fluctuation by 68mV. A dual duty-cycle corrector is proposed to average duty error, and tuning is added to the auto-calibration of driver and termination impedance.

Samsung Electronics will publish some details on their 80nm 512Mb GDDR4 SDRAM running at 2GHz frequency with max data rate of 4Gbps/pin at ISSCC. In comparison, the fastest commercially available Samsung GDDR4 memories clocked at 1.4GHz while ATi Radeon X1950XTX runs at 1GHz and ATi R600 is rumored to run at 1.1GHz. To save power and lower noise, it employs a data-bus inversion coding scheme with an analog majority voter insensitive to mismatch, which reduces peak-to-peak jitter by 21ps and voltage fluctuation by 68mV. A dual duty-cycle corrector is proposed to average duty error, and tuning is added to the auto-calibration of driver and termination impedance.