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This paper presents an automatic within-pair skew compensator for high-speed differential data transmission. A wide-bandwidth data delay line is proposed to provide adjustable delay for data signals. Also presented is an on-chip within-pair skew detection circuit to detect skew between the differential data signals for automatic close-loop skew compensation. A within-pair skew compensator prototype for 5 Gb/s data was fabricated in 0.13 μm CMOS. Measurement results show that the within-pair skew compensator can automatically compensate for within-pair skew of ± 200 ps (± 1 unit interval). It consumes 20.4 mW from 1.2 V supply and occupies 0.015 mm2 die area.