Inventions

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Phase Interpolator-Based CDR

In order to communicate data from one chip to another across a signal line, the receiving chip must know when to sample the data signal that it receives from the transmitting chip. In many systems, this information is provided by a timing (clock) signal sent from the transmitting chip to the receiving chip along a [...]

Output Driver Calibration

Transmitting data at high speeds between a DRAM device and a memory controller requires careful design of IO drivers to ensure that the required electrical signaling levels are achieved. Variations in process, voltage, and temperature can alter the electrical characteristics of the output driver circuitry, resulting in deviations from the desired signaling levels. Additionally, variations [...]

Color Temperature Change

Since LEDs are available in a series of colors that cross the spectrum of white, there is a high degree of variation of color temperatures in lamps. This can make it difficult for consumers to blend new LED bulbs with existing lighting and can increase complexity of inventory management for professionals. Rambus’ color temperature change [...]

Near Ground Signaling

Reduced power consumption has become of key importance in memory system design—from mobile to enterprise-class applications. In addition to clocking power and DRAM core access power, IO signaling power must be addressed in order to reduce the total power consumption of the memory system. Near ground signaling is a single-ended, ground-terminated technology theat enables high [...]

Module Threading

The growing trend of multi-core processing and converged graphics-compute processors is increasing the performance requirements on the DRAM memory subsystems. Multi-thread computing and graphics not only need higher memory bandwidth but also generate more random accesses to smaller pieces of data. Module Threading improves the throughput and power efficiency of a memory module by applying [...]

FlexPhase™ Timing Adjustment Circuits

Precise on-chip alignment of data clock are crucial for today’s high performance memory systems. In addition, offsets in timing caused by variations in process, voltage and timing must be accounted for. FlexPhase™ Timing Adjustment Circuits are a key technology ingredient for achieving high data rates on chip-to-chip systems that reference an external clock signal. By [...]

DPA Countermeasures

Many electronic devices that use cryptography are susceptible to side channel attacks. These low-cost, non-invasive methods enable attackers to extract the secret cryptographic keys used during normal device operations by monitoring a device’s timing, power consumption, or electromagnetic emissions. Side channel attacks leave no trace, and can often be performed quickly using consumer-level equipment. Once [...]

Double Bus Rate Technology

In many computing systems today, memory bandwidth is a key factor in determining overall system performance, and its importance continues to grow as these systems evolve. Rambus developed a technique for improving memory system bandwidth by increasing the per-pin signaling rate of the data pins of the DRAM. Double Data Rate (DDR) SDRAMs are an [...]

Asymmetric Equalization

Enables very high bandwidth on next generation memory systems. Signal equalization is applied asymmetrically across the memory PHY and DRAM communication link and improves overall signal integrity while minimizing the complexity and cost of the DRAM device. […]

VirtuOptic™ Reflectors

VirtuOptic™ reflectors deliver a highly efficient, collimated light pattern that can be evenly distributed over wide areas, making it ideal for high brightness architectural, entertainment and commercial lighting applications. When combined with Rambus' proprietary optical modeling and design techniques, the shape and size of the VirtuOptic reflectors can be optimized to achieve a highly-controlled, directed [...]