11.8 An Echo-Cancelling Front-End for 112Gb/s PAM-4 Simultaneous Bidirectional Signaling in 14nm CMOS

Farjad-Rad, R.; Kaviani, K.; Nguyen, David; Brown, Michael; Geelen, Govert; Bastiaansen, Corné; Rao, N. Bhaskara; Popuri, Viswa; Shen, Greg; Khatibi, Hamid; Dey, Saudas; Chatterjee, Anirban; Shen, Daozhi; Zijlstra, Peter; Gunnink, Harrie; Zhang, Kebin; Penumuchu, Venkat; Weiss, Oliver; Paulus, Edward; Briaire, J.

doi:10.1109/isscc42613.2021.9365852

Cited by 10 publications

(5 citation statements)

References 2 publications

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“…Furthermore, most of these techniques require timing synchronization between the far-end and the near-end signals, to ensure that the interference is suppressed/cancelled sufficiently, as the amount of cancellation depends on the receiver sampling phase [19], [20], [30], [31]. To overcome the above mentioned limitations, digital techniques have to be implemented, which can support interference cancellation adaptively [18]. However, implementing SI cancellation using digital approaches is often power and area inefficient.…”

Section: Introductionmentioning

confidence: 99%

A True Full-Duplex IO (TFD-IO) with Background SI Cancellation for High-Density Interfaces

Goyal¹,

Parulekar²,

Gupta³

2021

Preprint

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In this work, we have proposed and experimentally demonstrated a true full-duplex IO (TFD-IO) for high-speed high-density interfaces. The proposed TFD-IO can be used as an independent module that converts a unidirectional IO/interconnect to a fully bidirectional IO/interconnect, to ideally double the throughput of the high-speed interface. <br>The TFD-IO uses a correlation-based technique to cancel the self-interference (SI) adaptively in the background. The signals transmitted from the near-end and the far-end can use independent baud-rates and signaling schemes in a TFD-IO. A proof-of-concept design of the TFD-IO module has been fabricated in a 65 nm CMOS technology, and demonstrated with bidirectional throughputs of up to 12.8\,Gb/s.

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Section: Introductionmentioning

confidence: 99%

A True Full-Duplex IO (TFD-IO) with Background SI Cancellation for High-Density Interfaces

Goyal¹,

Parulekar²,

Gupta³

2021

Preprint

View full text Add to dashboard Cite

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“…To achieve higher throughputs, recent high-speed FD interconnects use hybrids with active circuits for interference suppression [11], [12], [16]- [20]. These hybrids effectively consist of one of the following: (i) a scaled replica generator with a subtractor [17]; (ii) a comparator with dynamic referencing [18], [21], [22]; (iii) a resistive or a capacitive bridge [11], [19]; (iv) a resistor-transconductor (Rgm) cell [12], [16]; and (v) a directional inverter/buffer (DIB) with weighted cancellation paths [23]. The main limitation in these schemes is that the AFEs do not account for the delay spread of the transmitted pulses that causes SI over multiple bit periods.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, most of these techniques require timing synchronization between the two transceivers, to ensure that the interference is suppressed/cancelled sufficiently, as the amount of cancellation depends on the receiver sampling phase [12], [18], [24], [25]. To overcome the above mentioned limitations, digital techniques have to be implemented, which can support interference cancellation adaptively [17]. However, implementing interference cancellation using digital approaches need a high resolution analog-to-digital converter, thus is often power and area inefficient [13], [17].…”

Section: Introductionmentioning

confidence: 99%

“…To overcome the above mentioned limitations, digital techniques have to be implemented, which can support interference cancellation adaptively [17]. However, implementing interference cancellation using digital approaches need a high resolution analog-to-digital converter, thus is often power and area inefficient [13], [17]. Furthermore, a significant training time may be required for adaption of the canceller's weight coefficients using the digital techniques.…”

Section: Introductionmentioning

confidence: 99%

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A True Full-Duplex IO (TFD-IO) with Background SI cancellation for High-Density Interfaces

Goyal¹,

Gupta²,

Parulekar³

2021

Preprint

View full text Add to dashboard Cite

In this work, we have proposed and experimentally demonstrated a true full-duplex IO (TFD-IO) for high-speed high-density interfaces. The proposed TFD-IO can be used as an independent module that converts a unidirectional IO/interconnect to a fully bidirectional IO/interconnect, to ideally double the throughput of the high-speed interface. The TFD-IO uses a correlation-based technique to cancel the self-interference (SI) and echoes adaptively in the background. The signals transmitted from the near-end and the far-end can use independent baud nm CMOS technology, and demonstrated with bidirectional throughputs of up to 12.8 Gb/s.

show abstract

“…To overcome the above mentioned limitations, digital techniques have to be implemented, which can support interference cancellation adaptively [18]. However, implementing SI cancellation using digital approaches is often power and area inefficient.…”

mentioning

confidence: 99%

A True Full-Duplex IO (TFD-IO) With Background SI Cancellation for High-Density Interfaces

Goyal

Parulekar

Gupta

2022

IEEE Trans. VLSI Syst.

View full text Add to dashboard Cite

In this work, we have proposed and experimentally demonstrated a true full-duplex IO (TFD-IO) for high-speed high-density interfaces. The proposed TFD-IO can be used as an independent module that converts a unidirectional IO/interconnect to a fully bidirectional IO/interconnect, to ideally double the throughput of the high-speed interface. The TFD-IO uses a correlation-based technique to cancel the self-interference (SI) adaptively in the background. The signals transmitted from the near-end and the far-end can use independent baud-rates and signaling schemes in a TFD-IO. A proof-of-concept design of the TFD-IO module has been fabricated in a 65 nm CMOS technology, and demonstrated with bidirectional throughputs of up to 12.8 Gb/s.

show abstract

11.8 An Echo-Cancelling Front-End for 112Gb/s PAM-4 Simultaneous Bidirectional Signaling in 14nm CMOS

Cited by 10 publications

References 2 publications

A True Full-Duplex IO (TFD-IO) with Background SI Cancellation for High-Density Interfaces

A True Full-Duplex IO (TFD-IO) with Background SI Cancellation for High-Density Interfaces

A True Full-Duplex IO (TFD-IO) with Background SI cancellation for High-Density Interfaces

A True Full-Duplex IO (TFD-IO) With Background SI Cancellation for High-Density Interfaces

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