Asymmetrical differential signaling for notchy wireline channels

A passive resonance mitigation technique for differential and multi-wire channels is proposed. In this method, the frequency responses of wires are adjusted using passive channel engineering to create intentional offset in respect to one another, resulting in an improved frequency response for the differential or multi-wire links. An example of the proposed technique has been implemented by intentionally increasing the capacitive load on one of the traces in a differential channel to diversify frequency response of the signal paths from the controller to the DRAM in the presence of frequency selective notches in the channel. The proposed idea is verified in an experimental setup and by comparing measured eye diagrams for standard differential channel against improved channel using proposed solution.