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This paper presents a forwarded-clock I/O receiver with wide range constant jitter tracking bandwidth (JTB). A JTB interpolator in the receiver enables wide JTB using a weak injection-locked oscillator (ILO) instead of a strong ILO, so narrow VCO tuning is possible. By using the JTB interpolator, the proposed receiver compensates for the JTB reduction caused by deskew-JTB dependency in conventional ILOs. An 8Gb/s receiver has been implemented to verify 70M~1GHz constant JTB and one UI deskew with only 1.94~2GHz VCO tuning. The 0.13μm test chip consumes 17.2~21.4mW and occupies 0.04mm2.