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A 0.47–0.66 pJ/bit, 4.8–8 Gb/s I/O Transceiver in 65 nm CMOS

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6 Author(s)
Song, Y.-H. ; Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX, USA ; Bai, R. ; Hu, K. ; Yang, H.-W.
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A low-power forwarded-clock I/O transceiver architecture is presented that employs a high degree of output/input multiplexing, supply-voltage scaling with data rate, and low-voltage circuit techniques to enable low-power operation. The transmitter utilizes a 4:1 output multiplexing voltage-mode driver along with 4-phase clocking that is efficiently generated from a passive poly-phase filter. The output driver voltage swing is accurately controlled from 100–200 ${rm mV}_{rm ppd}$ using a low-voltage pseudo-differential regulator that employs a partial negative-resistance load for improved low frequency gain. 1:8 input de-multiplexing is performed at the receiver equalizer output with 8 parallel input samplers clocked from an 8-phase injection-locked oscillator that provides more than 1UI de-skew range. In the transmitter clocking circuitry, per-phase duty-cycle and phase-spacing adjustment is implemented to allow adequate timing margins at low operating voltages. Fabricated in a general purpose 65 nm CMOS process, the transceiver achieves 4.8–8 Gb/s at 0.47–0.66 pJ/b energy efficiency for ${rm V}_{rm DD}=0.6$–0.8 V.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:48 ,  Issue: 5 )

Date of Publication:

May 2013

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