US 12,316,483 B2
Encoding and decoding for PAM transmitter and receiver
Jose A. Tierno, Palo Alto, CA (US); Sanjeev S. Gokhale, Austin, TX (US); Sunil Bhosekar, Austin, TX (US); and William D. Schwarz, Austin, TX (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Sep. 16, 2022, as Appl. No. 17/932,991.
Prior Publication US 2024/0097877 A1, Mar. 21, 2024
Int. Cl. H04L 25/49 (2006.01)
CPC H04L 25/4917 (2013.01) 20 Claims
OG exemplary drawing
 
1. An apparatus comprising:
an encoder circuit configured to:
encode an input data word, having n bits, into respective first and second output data words, each having m bits, wherein m is greater than n, and wherein each of the first and second output data words include a respective first subset of bits and a respective second subset of bits;
identify one of the first subsets of bits that is a complement to one of the second subsets of bits; and
select the identified first and second subsets of bits to form a transmit data word; and
a transmitter circuit configured to serially transmit, using a plurality of voltage levels, a plurality of symbols whose values are based on the transmit data word.