  Content addressable memory is popular in the field of intelligent computing
systems with its searching nature. Emerging CAMs show a promising increase in
pixel density and a decrease in power consumption than pure CMOS solutions.
This article introduced an energy-efficient 3T1R1C TCAM cooperating with
capacitor dividers and RRAM devices. The RRAM as a storage element also acts as
a switch to the capacitor divider while searching for content. CAM cells
benefit from working parallel in an array structure. We implemented a 64 x 64
array and digital controllers to perform with an internal built-in clock
frequency of 875MHz. Both data searches and reads take 3x clock cycles. Its
worst average energy for data match is reported to be 1.71 fJ/bit-search and
the worst average energy for data miss is found with 4.69 fJ/bit-search. The
prototype is simulated and fabricated in 0.18 um technology with in-lab RRAM
post-processing. Such memory explores the charge domain searching mechanism and
can be applied to data centers that are power-hungry.
