a circuit includes a first pre - charge module , a first multiplexer module , a second pre - charge module , a second multiplexer module , a sense amplifier circuit , a third pre - charge module , an output module . the circuit is operatively coupled to a first core block and a second core block to provide the desired matching characteristics . the first core block and the second core block are memory blocks used for storing data bits for read - write operations . the circuit utilizes a unique operational coupling with one of the core blocks to provide the matching characteristics .