US 12,003,354 B2
Clock data recovery with decision feedback equalization
Richard Simpson, Bedford (GB); and Ali Hormati, Ecublens Vaud (CH)
Assigned to KANDOU LABS, S.A., Lausanne (CH)
Filed by Kandou Labs, S.A., Lausanne (CH)
Filed on Jun. 6, 2023, as Appl. No. 18/330,187.
Application 18/330,187 is a continuation of application No. 17/517,042, filed on Nov. 2, 2021, granted, now 11,671,288.
Application 17/517,042 is a continuation of application No. 17/028,834, filed on Sep. 22, 2020, granted, now 11,165,611, issued on Nov. 2, 2021.
Application 17/028,834 is a continuation of application No. 16/261,502, filed on Jan. 29, 2019, granted, now 10,785,072, issued on Sep. 22, 2020.
Application 16/261,502 is a continuation of application No. 15/582,545, filed on Apr. 28, 2017, granted, now 10,193,716, issued on Jan. 29, 2019.
Claims priority of provisional application 62/328,716, filed on Apr. 28, 2016.
Prior Publication US 2023/0318887 A1, Oct. 5, 2023
Int. Cl. H04L 25/03 (2006.01); H04L 7/00 (2006.01); H04L 7/033 (2006.01)
CPC H04L 25/03949 (2013.01) [H04L 7/0087 (2013.01); H04L 7/033 (2013.01); H04L 25/03057 (2013.01); H04L 25/03885 (2013.01); H04L 7/0025 (2013.01)] 20 Claims
OG exemplary drawing
 
6. An apparatus comprising:
a continuous time linear equalizer (CTLE) configured to receive a data signal comprising a plurality of data patterns over a series of signaling intervals and to filter the data signal to generate a filtered data signal having altered signal trajectories;
a voltage comparator configured to generate a sample of the filtered data signal responsive to a sampling clock and according to a decision threshold associated with a decision feedback equalizer coefficient;
a data pattern detection circuit configured to identify a specific data pattern associated with the sample; and
a selection circuit configured to responsively process the sample as (i) a valid data decision, (ii) a phase error sample to provide to a clock recovery circuit for adjusting the sampling clock, or (iii) an unneeded sample which may be ignored.