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This paper presents two ultra-high-speed SerDes dedicated for PAM4 and NRZ data. The PAM4 TX incorporates an output driver with 3-tap FFE and adjustable weighting to deliver clean outputs at 4 levels, and the PAM4 RX employs a purely linear full-rate CDR and CTLE/1-tap DFE combination to recover and demultiplex the data. NRZ TX includes a tree-structure MUX with built-in PLL and phase aligner. NRZ...
An algorithm is presented for direct acquiring PRN code based on sub-sampling, utilizing the auto correlation characteristic of the long period PRN code in DSSS (direct sequence spread spectrum) system. As decreasing signal-to-noise, the performance of algorithm is analyzed, and it is proved effectively by simulation, under sub-sampling.
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