US 11,657,876 B2
Analog content-address memory and operation method thereof
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 May 20, 2021, as Appl. No. 17/325,244.
Prior Publication US 2022/0375526 A1, Nov. 24, 2022
Int. Cl. G11C 15/04 (2006.01); G11C 16/10 (2006.01); G11C 16/26 (2006.01); G11C 16/34 (2006.01); G11C 16/04 (2006.01)
CPC G11C 16/102 (2013.01) [G11C 15/04 (2013.01); G11C 16/0433 (2013.01); G11C 16/26 (2013.01); G11C 16/3404 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An analog content-address memory (analog CAM), comprising:
at least one matching line;
at least one analog CAM cell, each of which includes:
a first floating gate device having a N type channel, wherein the first floating gate device is connected to the matching line; and
a second floating gate device having a P type channel, wherein the first floating gate device and the second floating gate device are connected in series, a match range is set through programming the first floating gate device and the second floating gate device, and the first floating gate device and the second floating gate device of the analog CAM cell are configured to receive an inputting signal; and
at least one sense amplifier, connected to the matching line, wherein if the inputting signal is within the match range, a voltage of the matching line is pulled down to be equal to or lower than a predetermined level and the sense amplifier outputs a match result.