US 11,875,849 B2
Analog content-address memory having approximation matching and operation method thereof
Yu-Hsuan Lin, Taichung (TW); Po-Hao Tseng, Taichung (TW); and Feng-Min Lee, Hsinchu (TW)
Assigned to MACRONIX INTERNATIONAL CO., LTD., Hsinchu (TW)
Filed by MACRONIX INTERNATIONAL CO., LTD., Hsinchu (TW)
Filed on Apr. 1, 2022, as Appl. No. 17/711,073.
Prior Publication US 2023/0317166 A1, Oct. 5, 2023
Int. Cl. G11C 15/04 (2006.01)
CPC G11C 15/046 (2013.01) 20 Claims
OG exemplary drawing
 
1. An analog content-address memory (analog CAM) having approximation matching, comprising:
an inputting circuit, configured to provide an inputting data;
at least one analog CAM cell, connected to the inputting circuit and receive the inputting data, wherein the analog CAM cell has a mild swing match curve whose highest point corresponds to a stored data, wherein a segment from the highest point of the mild swing match curve to a lowest point of the mild swing match curve corresponds to at least three data values; and
an outputting circuit, connected to the analog CAM cell and receive a match signal from the analog CAM cell, wherein the outputting circuit outputs a match approximation level according to the match signal.