Design of Energy-Efficient Single-Ended Frequency-Division Multiplexing Wireline Transceivers

Speaker: Jieqiong Du
Affiliation: UCLA Ph.D. Candidate

Abstract:  The demand for the aggregated I/O bandwidth increases rapidly while the number of available I/Os increases only slightly due to the limitation of packaging technologies. Compared with differential signaling, single-ended signaling improves the pin-efficiency and I/O bandwidth by doubling the data rate per pin and is widely used for multi-lane applications such as memory interfaces, for example. However, as the date rate increases, inter-symbol interferences due to frequency-dependent channel loss and crosstalk in multi-lane applications can severely degrade signal integrity. Equalizers and crosstalk canceller are required for conventional NRZ links to inverse the channel function for data recover, which limits the energy efficiency of the wireline transceivers.

In this presentation, frequency-division multiplexing single-ended transceivers are proposed to alleviate inter-symbol interferences and far-end adjacent-channel crosstalk efficiently. The transceiver mitigates inter-symbol intereferences by enabling smaller symbol rate and therefore reducing in-band loss variation. The transceiver also exploits the characteristic of crosstalk between closely spaced microstrip lines and reduces crosstalk by exploiting both frequency orthogonality and phase orthogonality. The proposed transceiver is implemented and tested in the TSMC 28nm HPC technode and achieves much better energy-efficiency as well as area-efficiency compared to conventional NRZ links.

Biography:  Jieqiong Du received the B.S. degree in Microelectronics from Shanghai Jiao Tong University, China, in 2012, and the M.S. degree in Electrical Engineering from University of California, Los Angeles (UCLA), in 2014.  She is currently pursuing the Ph.D. degree in Electrical Engineering from the University of California, Los Angeles (UCLA).  Her research interests include high-speed mixed signal circuits and I/O links. She was a recipient of the Broadcom Fellowship in 2016.

For more information, contact Prof. M.C. Frank Chang ()

Date(s) - Jul 01, 2019
2:00 pm - 4:00 pm

E-IV Tesla Room #53-125
420 Westwood Plaza - 5th Flr., Los Angeles CA 90095