A 12.5Gb/s/link non-contact multi drop bus system with impedance-matched transmission line couplers and Dicode partial-response channel transceivers

A reduced-reflection multi-drop bus system using Dicode (1-D) partial response signaling transceiver is presented for the first time in the world. Directional couplers on transmission lines arranged with equi-energy distributing and exact impedance matched conditions allow the bus to reach to 12.5Gbps/link speed. The transmission line has 5-convex portions to form one side of a coupler where the transmission line width is adjusted to control the characteristic impedance of the coupling section, minimizing signal reflection from each section. Dicode partial-response signaling method with a half-rate architecture was used where a precoder is placed in the transmitter to make the signal best fit for the channel to eliminate inter symbol interference (ISI) where the test chip transmitter occupies 3,750 μm² and the receiver occupies 750 μm² with 90nm CMOS technology, consuming 40mA and 23mA respectively at the supply voltage of 1.2V.