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Fully integrated SiGe BiCMOS transmit and receive PLLs for 8B/10B coded 10 Gb/s serial links operate with excellent jitter characteristics. The transmit PLL (TxPLL) provides a 12.5 GHz clock with 0.4 ps rms jitter synthesized from a /spl sim/195.3 MHz reference. The receive PLL (RxPLL), which exhibits <0.56 ps rms jitter generation, extracts a full rate clock and recovers data from a 12.5 Gb/s input bit stream. The RxPLL operates error-free when tested with a 14 km optical link test bench. The power consumption of the TxPLL and RxPLL cores at 3.3 V are 270 mW and 330 mW, respectively.