Design Of A High Speed CMOS LVDS Transceiver IP Core

With the further development of information technology, a significant increase inthe amount and the speed of data transmission has been greatly concerned, so does thereduction of the power consumption. Due to their own limitations, the traditional I/Ointerfaces can not meet real needs. Therefore, the research for new transmissiontechnology with both high-speed data transmission and low-power, low-noise, low-cost,has become an inevitable trend. Low Voltage Differential Signaling technology(referred to as LVDS) is an effective way to achieve high-speed and low-power datatransmission, the technology makes it possible to solve the bottleneck problem of datatransmission.Based on the study of high-speed LVDS interface circuit, the thesis designs ahigh-speed CMOS LVDS transceiver. The main work includes analysis of LVDS systemarchitecture, circuits design and physical implementation of LVDS transceiver’s basicmodules. LVDS driver in this thesis works in dual current source mode, with theintroduction of common-mode feedback circuit and pre-emphasis technology to ensurethe integrity of the signal and improve the stability of the system. A novel LVDSreceiver structure, which comprises rail-to-rail preamplifier, hysteresis comparator,shaping buffer circuit and fail-safe circuit, has been proposed. This receiver not onlyexpands the common-mode range, but also inhibits the system noise effectively.The implementation of designed LVDS transceiver is based on SMIC0.18μm1P6M CMOS technology, with effective area of91×244μm2. The simulation resultsunder three different process corners are as follows. LVDS driver with2.5Gbps data rateworks in the power supply voltage of1.8V, its output common-mode voltages can bestabilized at1.25V nearby, and the output signal swings are all around350mV. Comparethe conditions which the input signal swing is200mV and350mV, the waveforms of thereceiver’s output have sharp rising and falling edges. All above indicates that LVDStransceiver system is stable and reliable, with excellent performance to meet the designspecifications.