介绍用于光纤通信的速率为2.5 G b/s的高速RS(255,239)译码器设计。对输入信号中可能出现的超出译码器纠错能力的误码可进行检测判断,保证了误码不扩散。对译码器中大量使用的有限域乘法器进行了优化设计,尤其对并行钱氏搜索电路中的乘法器采用了按组优化设计方法,与直接实现方法相比,复杂度降低了45%。该RS译码器已用FPGA进行了功能验证,并用TSM C 0.18μm CM O S工艺实现,Synopsys综合后的仿真结果表明译码器电路时钟工作频率达到了330 MH z。
The design of a 2. 488 Gbit/s clock and data recovery （CDR） If for synchronous digital hierarchy （SDH） STM-16 receiver is described. Based on the injected phase-locked loop （IPLL） and D-flip flop architectures, the CDR IC was implemented in a standard 0. 35 μan complementary metal-oxide-semiconductor （CMOS） technology. With 2^31 -1 pseudorandom bit sequences （PRBS） input, the sensitivity of data recovery circuit is less than 20 mV with 10^-12 bit error rate （BER）. The recovered clock shows a root mean square （rms） jitter of 2. 8 ps and a phase noise of - 110 dBc/Hz at 100 kHz offset. The capture range of the circuit is larger than 40 MHz. With a 5 V supply, the circuit consumes 680 mW and the chip area is 1.49 mm × 1 mm.
