US 11,810,633 B2
Receiver training of reference voltage and equalizer coefficients
Ashwin S. M., Karnataka (IN); Anirudha Shelke, Karnataka (IN); Navin Kumar Mishra, Karnataka (IN); Phalguni Bala, Karnataka (IN); Younus Syed, Karnataka (IN); Kiran Baby, Karnataka (IN); and Sudhir Kumar Katla Shetty, Karnataka (IN)
Assigned to Cadence Design Systems, Inc., San Jose, CA (US)
Filed by Cadence Design Systems, Inc., San Jose, CA (US)
Filed on Aug. 30, 2021, as Appl. No. 17/460,701.
Application 17/460,701 is a continuation of application No. 17/026,133, filed on Sep. 18, 2020, granted, now 11,133,081.
Claims priority of provisional application 62/904,598, filed on Sep. 23, 2019.
Prior Publication US 2022/0051742 A1, Feb. 17, 2022
Int. Cl. G11C 7/10 (2006.01); G11C 29/36 (2006.01); G11C 7/22 (2006.01); G11C 29/50 (2006.01)
CPC G11C 29/36 (2013.01) [G11C 7/22 (2013.01); G11C 29/50004 (2013.01); G11C 2207/2254 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for calibrating a receiver of a communication link, the receiver comprising at least a first equalizer to generate a sampler input signal based on a receiver input signal, and a sampler sampling the sampler input signal to generate an output signal, the method comprising:
receiving, at a receiver over the communication link, a receiver input signal;
determining, for each of a plurality of reference voltages, a corresponding first equalizer coefficient for the first equalizer and a corresponding plurality of parameters of the sampler input signal that are based on the reference voltage and the corresponding first equalizer coefficient, the corresponding plurality of parameters for each of the plurality of reference voltages including a timing parameter indicative of a timing of when the sampler input signal crosses a threshold where the timing is based on the reference voltage and the corresponding first equalizer coefficient;
selecting a reference voltage from among the plurality of reference voltages and the selected reference voltage's corresponding first equalizer coefficient that have the corresponding plurality of parameters of the sampler input signal that satisfy a plurality of optimization criterion, the selected reference voltage and the corresponding first equalizer coefficient of the selected reference voltage having a timing parameter that satisfies a timing criterion included in the plurality of optimization criterion; and
setting the selected reference voltage.