Read-only memories, and readout circuits therefor

Details Read-only memories, and readout circuits therefor Read-only memories, and readout circuits therefor

1975-10-17

1977-06-21

Fears, Terrell W.

Communications: electrical

Digital comparator systems

340173SP, G11C 1140, G11C 1700

Patent

active

040315240

ABSTRACT:
A read-only memory and sense amplifier system for sensing whether a selected memory cell of a memory bank includes a high-impedance memory device, or a low-impedance device, and for generating a binary output signal representing stored data in response to the sensed difference. The cells are programmed with a pattern of high and low-impedance devices, such as inoperative and operative field-effect transistors in accordance with stored data. The memory bank, including the impedance of the selected cell, is connected to a first input node of the amplifier, and has either: (A) a first or "ON" bank impedance between the first node and a reference node, such as circuit ground, if the selected cell is in the low-impedance state: or (B) a second or "OFF" bank impedance if the selected cell is in the high-impedance state. A reference impedance is connected between the other amplifier node and the reference node, and has a value between the ON bank impedance and the OFF bank impedance. The amplifier includes circuitry for sensing a difference in impedance connected to the two nodes, and for generating the binary output signal in response to the sensed difference, representing the data stored in the selected memory cell.

REFERENCES:
patent: 3618050 (1971-11-01), Heeren et al.
patent: 3838404 (1973-05-01), Heeren
patent: 3946368 (1976-03-01), Chou

Affiliated with

Also associated with

Rating

Read-only memories, and readout circuits therefor does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Read-only memories, and readout circuits therefor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Read-only memories, and readout circuits therefor will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-739751