Abstract:

This paper introduces the theory of pre-emphasis technique,and analyzes the attenuation of signal transmitting on high speed circuit board,uses pre-emphasis technique to preprocess the signal,enhances the high frequency part of the signal,and improves the signal transmitting quality.By observing the waveform and the eye diagram of the received signal,the proper pre-emphasis coefficient k=1.3 is confirmed with a pre-emphasis intensity of 30%.The circuit simulation is verified and accomplished in ADS environment,which applies the co-simulation of DSP and Analog/RF.The results show that the waveform rising edge of the signal passing through the transmission medium is improved,and the eye diagram height is significantly increased.

Key words: pre emphasis;equalization;high speed signal;eye diagram