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Although the LPDDR4 interface has enabled industry requirements, such as low power consumption and high bandwidth, additional evolution of the current LPDDR4 performance is expected. To respond to the need for more power efficient devices with higher bandwidth, a 2nd generation LPDDR4 (referred to as LPDDR4X), with extreme low power and extended performance, has been developed in this work. In the...
This paper presents a 4.4Gbps/pin all-digital LPDDR4 PHY with a bit-slice architecture in 10nm FinFET process technology. The proposed bit-slice architecture includes new I/O structure for area reduction without any off-chip performance degradation and digital duty-tuning capability to maximize the valid window margin, which contributes to low voltage operation in memory interface system. The test...
An all-digital 90 phase shift delay lock loop (DLL) is presented, which is robust against the delay mismatch caused by process variation. Each of the four 90 phase shift blocks accurately aligns its output to a 90 shifted phase using its own ring oscillator and locking delay code. It is analytically proved that the phase shift accuracy of the proposed 90 phase shift...
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