Line encoder with serial data transmission for automotive applications

In this paper are presented the results regarding the implementation of a reliable encoder that is intended to be used in automotive applications for accurately transferring digital signals from different types of sensors, control elements and other peripheral components to a central processing unit. The designed module is capable to operate with various line coding schemes such are: NRZ (non-return-to-zero), RZ (return-to-zero), AMI (alternate mark inversion) and Manchester (phase encoding). During extensive simulations and practical measurements it was revealed that the maximum data communication speed achieved by the designed system is around 1 Mb/s, when the signal-to-noise ratio is maintained above 10 dB. The enhanced implementation of the proposed encoder, based on synchronized line-codes, offers good performances regarding the resistance to perturbations as well as an improved spectral shaping and clock recovering capabilities for obtaining efficient internal data transmission systems for vehicles.