A novel serial link transceiver, using a new combination of MPPM and PAM schemes

Abstract

In this paper, an efficient modulation technique, which was a new combination of multi-pulse position modulation (MPPM) and pulse amplitude modulation methods, was introduced. Using the proposed modulation, 8-bit per symbol data rate was achieved. Applying this method increased the data rate value and reduced the power consumption value. In addition, due to the use of MPPM method in the proposed modulation, the generated signal was of the return-to-zero nature. This means that the clock signal was embedded inside the modulated signal. Therefore, there was no need to apply a complicated clock recovery circuit in the receiver side. Moreover, by sending the 8-bit data and clock signal through a single channel, the value of pin count was reduced considerably. To implement this new scheme, a new transceiver was proposed in this paper. Further, a very simple slot selector circuit was proposed to create 5-time slots per symbol. In addition, a new structure of absolute comparator circuit was designed to reduce the number of comparators at the receiver side. The whole power dissipation of the proposed transceiver was only 101 mW.