Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1989-08-11
1991-05-07
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307443, 307451, 307572, 307546, 307481, 365203, 365208, H03K 1716, H03F 345
Patent
active
050139436
ABSTRACT:
A single ended sense amplifier senses whether or not a memory cell in an array conducts current from a bit line conductor to which the sense amplifier is connected. A first stage of the sense amplifier includes a number of separately biased transistors which establish a lower voltage level at a node when the cell conducts current than the higher voltage level at the node when the cell does not conduct current. A second stage of the sensed amplifier includes transistors connected in an inverting arrangement to receive the signal from the node and supply an output signal at an output terminal in response thereto. An equalizing transistor is selectively connected between the node and the output terminal and establishes a high gain bias point voltage at the node when conductive. The high gain bias point in intermediate the higher and lower voltages established at the node by the first stage. As soon as the equalizing transistor becomes nonconductive, the second stage is immediately driven to the correct output signal level by the voltage at the node from the first stage. A precharge transistor is conneced to the bit line to raise the voltage on it to a predetermined high level, thereafter allowing the voltage to decay before sensing the logical state of the cell. Precharging the bit line avoids the uncertainties associated with charging the bit line capacitance.
REFERENCES:
IBM Tech. Disc. Bul., "Power Supply Stabilization Circuit", Gray et al., vol. 21, No. 4, 9/78.
IBM Tech. Disc. Bul., "Read-Only Storage Bit Precharge/Sense Circuit", Cordaro, vol. 17, No. 4, 9/74.
Ley John R.
Miller Stanley D.
Simtek Corporation
Wambach Margaret Rose
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