Sharp’s optical cabling system designed for mobile phone
Sharp Corp of Japan has unveiled its prototype of optical system specially designed for mobile phones. Sharp is not alone in developing such system but there are few manufacturers who are working on the entire system from IC to the connector. Sharp aim is to decrease the overall power consumption in the mobile phone plus reducing the mounting surface area. Sharp development began in the area of optical signaling specifically for mobile phone in order to eliminate the EMI (Electromagnetic Interference) that is generated by the signal transfer path. Due to rise in internal data rate thanks to multi functional operation of mobile phone and higher pixel counts of their LCD display the EMI has become a major obstacle among Mobile phone manufacturers. The prototype system comprises of physical connector, mount for optical transceiver plus IC capable of handling such task as electrical signal processing and light emitting device drive. Sharp also uses a voltage controlled oscillator (VCO) in reducing power consumption and mounting footprint making it possible to eliminate one PLL (Phase Locked Loop) from VCO so the power consumption at 1.25 Gbps is at 108mW compared to 2 PLL where the power consumption is at high as 120mW. The current IC mounting foot print is 14mm square but Sharp with shift to 90nm manufacturing process is planning to reduce this size to 5 to 6nm square. Trend for thinner mobile phone and rotating display put a constrain on both the connector’s width and height, where connector must pass through the hinges in the process of manufacturing and must be around 3mm in diameter which is less than cable port diameter and it must have a height of around 1.1mm. The current prototype connector dimension is only 2.8mm (width) x 10mm (length) x 1.1mm (height). Sharp development target is maximum power consumption of 50mw.
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