| Summary: | 碩士 === 國立中央大學 === 電機工程研究所 === 91 ===
In this thesis, our major topic is to discuss the effect of simultaneous switching noise (SSN) on signal integrity and to reduce the noise magnitude. First, we will study the channel modeling, signaling noise sources and low voltage differential signaling (LVDS) standard. We also briefly introduce the factors which causes SSN and some mechanisms to reduce the noise in the past. Basing on these considerations, we propose the orderly turn-on method of the output driver, and we apply this method in a 2Gbps transceiver of the assisted gunning transceiver logic (AGTL) standard and a 5Gbps transceiver of the LVDS standard. Without using the current source, we can further reduce the transistor size and the cost. We also invent a decoder to control the voltage level against the process variation.
A 2Gbps transmitter has been implemented in this thesis. It is compatible with the AGTL standard. Fabricated in a TSMC 0.18-um CMOS technology, the transmitter circuit operates at 2Gbps with a 1.8V power supply and the chip area is 1.5x1.5mm2. It has been approved for fabrication by the Chip Implementation Center (CIC). The simulation result shows that the SSN effects have been reduced to half of the original ones. Furthermore, we also simulate a 5Gbps transceiver of the LVDS standard and the SSN effect has been reduced to 70mV. By these methods, we can reduce the SSN effect and maintain the voltage level of output signal without using any current source.
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