Session 8-3

An 8Gb/s Forwarded-Clock I/O Receiver
with up to 1GHz Constant Jitter Tracking Bandwidth
Using a Weak Injection-Locked Oscillator in 0.13µm CMOS

 

Abstract

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 also 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.