The disadvantage that caused the near disappearance of this architecture is the inherent vulnerability to noise, which affects the effectiveness of the differential sense amplifiers.
12.
However, once a row is read, subsequent column accesses to that same row can be very quick, as the sense amplifiers also act as latches.
13.
Specialised current-sense amplifiers, by contrast are designed so that, when powered from a low-voltage power rail such as " V"
14.
There is one sense amplifier for each column of memory cells, so there are usually hundreds or thousands of identical sense amplifiers on a modern memory chip.
15.
There is one sense amplifier for each column of memory cells, so there are usually hundreds or thousands of identical sense amplifiers on a modern memory chip.
16.
After a memory word is fetched, the memory is typically inaccessible for an extended period of time while the sense amplifiers are charged for access of the next cell.
17.
Modern sense-amplifier circuits consist of two to six ( usually four ) transistors, while early sense amplifiers for core memory sometimes contained as many as 13 transistors.
18.
When the memory controller needs to access a different row, it must first return that bank's sense amplifiers to an idle state, ready to sense the next row.
19.
They utilize a " current-sense resistor " to convert the load current in the power rail to a small voltage, which is then amplified by the current-sense amplifiers.
20.
When is driven low, a cycle must not be attempted until the sense amplifiers have sensed the memory state, and must not be returned high until the storage cells have been refreshed.
