Patent ID: 7599316

Claim:
A method for providing a bidirectional communications interface including a bridge connecting a transmitter and a receiver to a transmission line, the method comprising: generating positive polarity data signals in a first differential amplifier and generating negative polarity data signals in a second differential amplifier, the first differential amplifier and second differential amplifier receiving differential signal pairs from each side of a differential link to the transmission line and the transmitter; independently controlling common mode rejection in each of the separate first and second differential amplifiers using bias signals generated in response to an output common mode feedback voltage from each of the first and second differential amplifiers; generating output logic signals representing data received on the transmission line from the positive polarity data signals and the negative polarity data signals; suppressing effects of input noise on the output logic signals by skewing an output amplifier transfer characteristic using an asymmetric transfer characteristic that offsets signal levels of the output logic signals with regard to input noise; and controlling symmetry in switching transients of the output logic signals by increasing a logic threshold voltage of a logic gate of the output amplifier above a mid-supply voltage of the logic gate.