Static information storage and retrieval – Read/write circuit – Precharge
Patent
1979-12-26
1981-12-08
Fears, Terrell W.
Static information storage and retrieval
Read/write circuit
Precharge
307289, 365154, G11C 1140
Patent
active
043051391
ABSTRACT:
For signal storage systems that interrogate a storage cell with a concomitant precharging of the cell signal line, non-linear capacitors are employed to provide automatic selective coupling of the respective signal line to a detector for determination of the cell state. By connecting a plurality of signal lines to a detector through respective non-linear capacitors that assume a significantly enlarged capacitance when the precharge voltage level is asserted, enhanced coupling of the signal line may be achieved and by selectively precharging the signal line to be interrogated, no triggering of enlarged capacitance at other signal lines occurs to load the detection system.
In a preferred symmetrical configuration for use with a reference comparison type of detection, shifts in the discharge characteristics for the two comparison inputs to the cell state detector resulting from manufacturing variations tend to cancel, thus permitting more sensitive detection to be employed.
To complement the preferred configuration, a special reference circuit using a pair of joined signal lines provides a ramp signal having intermediate voltage values relative to the state-indicative signals produced by interrogated cells for the two respective cell states. By using a reference circuit that is located with and uses the same devices as the storage circuitry, any shifts in characteristics as a result of manufacturing variations have a greater tendency to cancel in the signal comparison.
REFERENCES:
patent: 3706891 (1972-12-01), Donofrio et al.
patent: 3739355 (1973-06-01), Radcliffe
patent: 3846768 (1974-11-01), Krick
patent: 3967252 (1976-06-01), Donnelly
patent: 4053873 (1977-11-01), Freeman
patent: 4082966 (1978-04-01), Lou
patent: 4087044 (1978-05-01), Hofmann
patent: 4091360 (1978-05-01), Lynch
patent: 4195357 (1980-03-01), Kuo
Fears Terrell W.
Grosser George E.
International Business Machines - Corporation
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