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This paper presents a 40-Gb/s phase-locked clock and data recovery (CDR) circuit with 1:4 demultiplexer in IBM 90-nm CMOS technology. The CDR circuit incorporates an inductorless eight-phase LC voltage-controlled oscillator (VCO) and a quarter-rate bang-bang phase detector (PD). A novel inductorless eight-phase LC VCO including four LC oscillator cells is presented to generate the eight-phase outputs...
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