Multi-stage sense amplifier for read-only memory having current

Details Multi-stage sense amplifier for read-only memory having current Multi-stage sense amplifier for read-only memory having current

1994-12-27

1996-08-06

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327 75, 327 74, G01R 1900, H03K 5153

Patent

active

055437389

ABSTRACT:
A multi-stage sense amplifier for read-only memory having a memory array consisting of a large number of memory cell units. The sense amplifier includes a sense amplifier for sensing the currents flowing through the transistor of the memory cell units of the read-only memory. The memory cell unit transistors are programmed with one of four current capacity characteristics. The sense amplifier also includes three current comparators coupled to the sense amplifier, with each of the comparators having a current comparing unit for comparing the sensed current flowing through the memory cell unit transistors to the current flowing through the comparators. An output of each of the three comparators is provided for identifying whether or not the current of a four capacity characteristics flowing through the memory cell unit transistors is larger than the current flowing through the comparator. Each of the outputs of the comparators is combined to represent the data stored in each of the memory cell units of the read-only memory having two bits per memory cell unit.

REFERENCES:
patent: 4287570 (1981-09-01), Stark
patent: 4653023 (1987-03-01), Suzuki et al.
patent: 5012448 (1991-04-01), Matsuoka et al.
patent: 5043940 (1991-08-01), Harari
patent: 5163021 (1992-11-01), Mehrotra et al.

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