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The demands on higher bandwidth with reduced power consumption in mobile market are driving mobile DRAM with advanced design techniques. Proposed LPDDR4 in this paper achieves over 39% improvement in power efficiency and over 4.3 Gbps data rate with 1.1 V supply voltage. These are challenging targets compared with those of LPDDR3. This work describes design schemes employed in LPDDR4 to satisfy these...
A 4.35Gb/s/pin LPDDR4 I/O interface with multi-VOH level, equalization scheme and Duty-Training Circuit (DTC) is presented. A Low Voltage-Swing Terminated Logic (LVSTL) driver using 4-to-1 multiplexer is implemented to the transmitter. A DTC to adjust the CK duty is implemented to the receiver. In addition, a ZQ calibration scheme for Multi-VOH level is also presented. Designed schemes are compatible...
The demands on higher bandwidth with reduced power consumption in mobile market are driving mobile DRAM to have advanced design techniques. Proposed LPDDR4 in this paper achieves over 30% improved power efficiency and over 4.3Gbps data rate with 1.1V supply voltage. These are challenging target comparing with that of LPDDR3. This works includes various techniques including multi-channel per die, various...
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