A HDB3 code multi-purpose encoders based on FPGA

摘要

HDB3 (High Density Bipolar)is an improved bipolar RZ code, based on the AMI. HDB3 has no DC component, less low-frequency components, the number of attached zeroes is no more than 3. All of the three advantages are beneficial to signal timing recovery. In this paper, by using modern EDA technology, and assistance of FPGA devices and the VHDL, we have designed and realized HDB3 encoder, which has overcame the traditional HDB3 encoder's disadvantages, like anti-poor and disadjustibility. Our product is charactered by the short development cycles, low-cost, fast speed of execution, strong reconfigurability, easy to upgrade and so on.