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This paper describes a dual-channel 23 (20 to 27) Gbps chipset designed in a 40-nm CMOS process for 40 Gbps differential quadrature phase-shift keying (DQPSK) optical transmission. The transmitter has a 2-tap FIR filter and generates two channels of full-rate data. Data outputs exhibit 10 ps rise/fall times, 0.2 RJ, 0.8 DJ, and a skew adjustment...
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