A 1.0Gb/s/ch Clock-shared differential signaling(CSDS) Tx using termination resistance tuning and multi-phase clock spreading for EMI reduction

A Clock-shared differential signaling(CSDS) transmitter is fabricated in 0.13 μm CMOS for 120 Hz 10-bit Full HD TVs. The proposed Tx driver takes advantages of PVT-insensitive tunable termination resistance with double feedback loops, and small reference voltage fluctuation. Moreover, a fully-digital duty cycle corrector is proposed, and compared to non-clock spreading, the relative near-field EMI level of multi-phase clock spreading is enhanced by 4.4 dB at the operating frequency of 500 MHz. The CSDS Tx with 34 channels consumes 300 mW at a 2.5 V power supply and 1.0 Gb/s/ch.