A 1.4 Gb/s 12-channel parallel laser diode driver IC for optical interconnections
The authors present a 12-channel parallel laser diode (LD) driver with 16.8 Gb/s throughput. The driver IC creates skew-free output and provides temperature compensation of the optical power of the LD. The IC also suppresses ringing oscillation and crosstalk. The die is 2.5x3.5 mm/sup 2/ using a 15 GHz f/sub /spl tau// Si bipolar process. The power supply voltage is 5 V and the power consumption is 4.2 W including the PECL level input signal consumption of 1.1 W and the output signal consumption of 2.0 W at 3l mApp + 2 mA bias.
Si bipolar 3.3 V transmitter/receiver IC chip set for 1 Gb/s 12-channel parallel optical interconnects
In view of the recent progress of data communication and multimedia technology, high-throughput I/O interfaces are required to realize systems that have higher performance. Many types of optical interconnects have been proposed, as alternatives to electrical ones, to solve certain problems respecting electromagnetic interference (EMI) and/or extension of connection distance. An optical parallel interconnect has an advantage of simple structure and short latency time compared with a serial one. This paper presents an IC chip set operating with a 3.3 V single power supply for 12-channel parallel optical transmitter/receiver modules as a universal interface device between inter- and/or intracabinet circuits.
Actuating Principle of Online Automatic Balancer with Counter Weight Driven by Magnetic Force
Kinematic precept of mass block in automatic balancer is proposed following the principle of online automatic dynamic balancing.By combination of electromagnet and permanent magnet,the magnetic circuit of the balancer with ring coil and rare earth permanent magnet is designed.Actuating process of the balancer is discussed and then a step drive voltage waveform is defined.For the high-speed grinding motorized spindle 170MD12Y16,the mechanical structure and dimensions of the balancer are schemed out.The electromagnetic simulations for the designed balancer are conducted and the better coil ampere-turns and reluctance adjusting ring thickness are then determined.The validity of simulation results is verified by a balancer driving experiment and the desired voltage value and its duration time are also determined.the designed balancer has a stable operation process without out-of-step and fluctuation around balanced position when the ampere-turns are considered as 1 kA,the reluctance adjusting ring thickness 0.2 mm,the driving voltage 12.4 V and the voltage duration time 120 ms.