System and method applied with computing-in-memory

A system comprising:

• at least one local generator coupled to a memory array, comprising:
• a current mirror;
• a sense amplifier having a first input coupled to the current mirror and a second input coupled to a multiply-and-accumulate circuit;
• a first group of transistors comprising:
• gate terminals coupled to a first group of switches;
• drain/source terminals coupled to the current mirror at a node;
• and
• source/drain terminals coupled to a first supply voltage terminal;
• and
• a second group of transistors coupled to the node through first transistors in the second group of transistors, wherein the second group of transistors comprises:
• second transistors having gate terminals coupled to a second group of switches;
• and
• third transistors each coupled in series with a corresponding one in the second transistors between the first supply voltage terminal and a second supply voltage terminal.

A method, comprising:

• activating, in response to an enable signal, a sense amplifier to generate a corresponding one of a plurality of output signals in a corresponding one in a plurality of sensing cycles;
• and
• adjusting a reference signal according to the plurality of output signals and a plurality of global signals in the plurality of sensing cycles,
• wherein activating the sense amplifier to generate the corresponding one of the plurality of output signals comprises:
• comparing the reference signal with a multiply-and-accumulate signal to generate the corresponding one of the plurality of output signals,
• wherein adjusting the reference signal comprises:
• decreasing the reference signal in the subsequent sensing cycle in response to determining that the reference signal is less than the multiply-and-accumulate signal in the current sensing cycle.