Abstract
This thesis includes two parts, namely the laser diode driver circuit design and low-voltage differential signal circuit design and measurement, both of them will be described in detail in each part of the design flow and illustrated the principle of operation by intuition. Laser diode driver circuit design includes the use of circuit simulation software and layout of the whole laser diode driver circuit. Also how to simulate the fiber modules. The light signals pass through the optical fiber because of chromatic dispersion and other effects caused by the ISI, which will affect the accuracy of the signal read out. This laser diode driver uses the taps architecture to cancel the ISI effect to ensure that the data can be read out correctly at high frequency. The principle of the circuits operation will be illustrated in the time domain. The laser diode drive circuit layout has few critical points need to know at high frequency operation, suck as matching and alignment, etc. Those key points illustrate in detail. LVDS circuit design considers the large amounts of data that can be transmitted per unit of time and achieves low jitter, common mode characteristic and signal integrity. This part design of modified hysteresis receiver and buffer, while the measurement can receive fast and correct data. This LVDS chip using 0.18 micron process and operating at 1.8 volts with the design of high-speed PCB can reach 500Mbps of eye diagram, and comply the specifications of LVDS. This chip contains four channels, which difference with the buffer, all of the channels can achieve 500Mbps eye diagram at measurement. It confirms the reproducibility and the reliability of this chip.