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A Single-Data-Bit Blind Oversampling Data-Recovery Circuit With an Add-Drop FIFO for USB2.0 High-Speed Interface

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5 Author(s)
Sang-Hune Park ; Pohang Univ. of Sci. & Technol., Gyungbuk ; Kwang-Hee Choi ; Jung-Bum Shin ; Jae-Yoon Sim
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A compact blind oversampling data-recovery circuit was implemented by using a coarse data-recovery block and an add-drop first-in first out, and it was successfully applied to the universal serial bus (USB)2.0 high-speed packet data transmission. The proposed circuit recovered the serial input data by selecting the sampled data among the 5X oversampled data of a single data bit. It reduced the number of transistors by more than half and the lock time to zero, compared to the conventional blind oversampling data-recovery circuit using the de-multiplexing scheme for multibit-data. The proposed circuit was implemented with a 0.18-m CMOS process. It worked at the data rates ranging from 180 to 720 Mbps. The bit-error rate was measured to be less than with the PRBS data transmitted though a 5-m USB cable. The chip area and the measured power consumption for 480-Mbps operation were 0.185 and 8.2 mW, respectively.

Published in:

Circuits and Systems II: Express Briefs, IEEE Transactions on  (Volume:55 ,  Issue: 2 )

Date of Publication:

Feb. 2008

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