Patent ID: 9699009
Date: 2017-07-04
CPC Classifications: H04B,H04L

Claim:
1. A four-level pulse amplitude modulation receiver with a four-level pulse amplitude modulation mode and a non-return-to-zero modulation mode, said receiver comprising: an input; first, second, and third four-level pulse amplitude modulation samplers coupled to said input, each of said first, second, and third four-level pulse amplitude modulation samplers having a corresponding output in turn comprising a corresponding binary decision of said first, second, and third samplers; a four-level pulse amplitude modulation decoder circuit having inputs coupled to said outputs of said first, second, and third four-level pulse amplitude modulation samplers, said four-level pulse amplitude modulation decoder circuit being active in said four-level pulse amplitude modulation mode; and a non-return-to-zero majority voting circuit coupled to said outputs of said first, second, and third four-level pulse amplitude modulation samplers, said non-return-to-zero majority voting circuit having an output and being configured to output a majority decision of said corresponding binary decisions of said first, second, and third samplers, said non-return-to-zero majority voting circuit being active in said non-return-to-zero modulation mode.