Memory device including bit line sense amplifier for constantly controlling sensing operation

A memory device comprising:

• a plurality of memory cell blocks, where each memory cell block comprises a plurality of memory cells;
• a plurality of bit line sense amplifier blocks arranged between the memory cell blocks and comprising bit line sense amplifiers performing operations of removing an offset voltage between a bit line and a complementary bit line, to which the memory cells are connected, and sensing and amplifying a voltage difference between the bit line and the complementary bit line;
• and
• a sensing-matching control circuit connected to one or more of the bit line sense amplifier blocks and determining levels of currents respectively supplied to a first sensing driving voltage line and a second sensing driving voltage line, wherein the first sensing driving voltage line and the second sensing driving voltage line are connected to the bit line sense amplifiers of the one or more bit line sense amplifier blocks, to which the sensing-matching control circuit is connected,
• wherein the bit line sense amplifiers of the one or more bit line sense amplifier blocks are driven based on the levels of currents of the first and second sensing driving voltage lines, the levels of currents being determined by the sensing-matching control circuit.

A memory device comprising:

• first and second memory cells;
• a bit line connected to the first memory cell;
• a complimentary bit line connected to the second memory cell;
• a first sense amplifier connected between the bit line and the complimentary bit line to supply a high level of voltage that is amplified in an operation of sensing and amplifying data of the memory cell;
• a second sense amplifier connected between the bit line and the complimentary bit line to supply a low level of voltage that is amplified in an operation of sensing and amplifying data of the memory cell;
• and
• a control circuit providing a first constant voltage to the first sense amplifier and a second constant voltage to the second sense amplifier.