Yoshiyuki Akiyama

A millimeter-wave intra-connect solution

A novel millimeter-wave Intra-Connect solution for short range, high speed, internal I/O connections in low-power logic 40 nm CMOS process is demonstrated. The system consists of a transmitter and a receiver that uses binary amplitude shift keying (ASK) modulation for a compact and power efficient design. The receiver realizes coherent demodulation using injection locking without a PLL or an external reference clock utilizing a path to inject the received signal into the VCO. The demonstrator achieves 11 Gb/s ASK data transmission over 14 mm using bond-wire antennas with a bit error rate (BER) of less than 10-11. The active footprint of the transmitter is 0.06 mm2 and the power consumption is 29 mW with an energy usage of 6.4 pj/bit per channel. The receiver occupies the active footprint of 0.07 mm2 and consumes 41 mW. The work shows the feasibility of the millimeter-wave Intra-Connect for high speed internal I/O connections.

A 12.5+12.5 Gb/s Full-Duplex Plastic Waveguide Interconnect

A new interconnect solution with plastic waveguide is demonstrated. The system consists of a pair of transceivers and a plastic waveguide. Millimeter wave signal is transmitted in a low-cost long piece of solid plastic dielectric acting as a waveguide. The plastic waveguide medium offers a large bandwidth for data communication using mm-wave carrier frequencies. Plastic waveguide interconnects do not require costly electrical-to-optical and optical-to-electrical conversion devices or precise alignment and offer longer transmission distances than wireless solutions due to better field confinement and lower path loss. Multiple plastic waveguides can be used in parallel and the modulated data at different frequencies can be multiplexed to increase the data rate. The demonstrated transceiver chips operate at carrier frequencies of 57 GHz and 80 GHz, and are fabricated in 40 nm low-power logic CMOS. The total area and power consumption of two transceivers are 0.41 mm2 and 140 mW, respectively. The fabricated demonstrator with Yagi-couplers achieves full-duplex transmission of 12.5 Gb/s ASK modulated signal in each direction over the 120 mm polystyrene waveguide with no equalization. The observed bit error rates for both channels are less than 10-12 for a PRBS length of 27-1 at the total data rate of 25 Gb/s. This paper shows the feasibility of the plastic waveguide interconnect as a promising alternative to electrical, optical, and wireless interconnects.

19.2: xvYCC: A New Standard for Video Systems using Extended-Gamut YCC Color Space

We have developed a new display / video camera and wide-gamut characterizing tools for a new standard for extended-gamut YCC color space called xvYCC. Video systems adapting this standard will have improved accuracy of color reproduction of real world.

High Density Optical Disk System Using Variable Five Modulation and Second Harmonic Generation Green Laser

We have realized the readout of optical disks with 6 times higher areal density than that of conventional compact discs (CDs). This system uses a new variable-length block code variable five modulation (VFM) and an optical pick-up with a miniature integrated diode-pumped second harmonic generation (SHG) green laser (mi-green laser) and a 0.6 NA objective lens.

High-pixel-rate grating-light-valve laser projector

— A high-pixel-rate, high-contrast (30,000:1) wide-color-gamut grating-light-valve laser projector is reported. A new optical engine enabling high-frame-rate (240 Hz) scan projection is employed. Panoramic wide-angle-scan projection with a 64:9 aspect ratio was also developed. Speckle noise is eliminated using a simple but highly efficient technique. The optical throughput efficiency of the grating-light-valve laser projector is reviewed.

56.1: High-Frame-Rate, High-Contrast Grating Light Valve Laser Projection Display

We report a high frame rate (240Hz), high contrast (30,000:1), wide color gamut GxL (G-by-L) laser projector. Proposed application areas for GxL are also discussed.

USEFUL LASER SOURCE CRITERIA FOR OPTICAL STORAGE EMPLOYING EXTENDED EYE-DIAGRAM JITTER THEORY

In view of the recent progress in visible lasers for next-generation optical disks, we describe the influence of source wavelength, aberration, and noise on eye-diagram jitter, which determines the ultimate disk density. The analysis indicates that the sources used in a readout of a 6× areal density, (4,22) run-length-limited code with a minimum mark length of 0.4 µm must have a wavelength that satisfies the Nyquist condition of relationship between the spot size and the minimum mark length, a wave-front aberration of less than 0.035 rms λ, and relative intensity noise of less than -125 dB/Hz.

Analysis of on-board antenna modules for the Millimeter-wave Intra-Connect System

We conducted a basic study of Millimeter-wave Intra-Connect Systems from the aspects of module implementation and transmission characteristics. We made small transmitter (TX) and receiver (RX) modules with on-board Yagi antennas using a resin material, and investigated the characteristics of the antennas. We also studied the relation of the transmission characteristics to module arrangement and the use of parallel metal plates as a simple case model. We confirmed extension of transmission distance by using the Yagi antenna with gain and sandwiching the modules between parallel plates.

4.1: Color Conversion from Film to xvYCC Video Signal

The color gamut of xvYCC is wider than that of film. We evaluated the color reproduction and developed a new method of converting the video signal, which reproduced color of a film in xvYCC color space faithfully.