An EMI resistant integrated LVDS transmitter in 0.18µm CMOS

In this paper, an on-chip method of compensating the effects of electromagnetic interference (EMI) on a low voltage differential signaling (LVDS) transmitter is presented. The proposed structure provides a level of linearity that enables the transmitter to maintain a wide differential opening by achieving a superior common-mode level independent driving current and common-mode feedback (CMFB) closed loop gain. Simulations illustrate that the proposed LVDS transmitter structure maintains an eye opening of at least 150mV and effectively transmits differential data in presence of an EMI ranging from 1MHz to 2GHz with an amplitude of up to 5V. This EMI robust LVDS transmitter was designed in the UMC 0.18μm CMOS process.