Static information storage and retrieval – Analog storage systems
Patent
1996-08-27
1998-02-10
Nelms, David C.
Static information storage and retrieval
Analog storage systems
365233, G11C 2700
Patent
active
057176230
ABSTRACT:
A current memory has an input (1) which is connected via a switch (S1) to inputs of a coarse memory cell (CM) and a fine memory cell (FM). On a phase .phi.1 of a clock signal the switch (S1) closes. During a first part .phi.1a of the clock .phi.1 of the coarse memory cell samples the input current and the outputs the sampled current thereafter. During a second part .phi.1b of the clock .phi.1 the fine memory cells senses and stores the difference between the input current and the output current of the coarse memory (CM). An output switch (S5) closes on phase .phi.2 of the clock, thereby passing the combined outputs of the coarse and fine memories to an output (2). A resistor r.sub.s is provided between the common nodes of the coarse and fine memories, having a resistance equal to the "on" resistance of the output switch (S5). This substantially compensates for the voltage drop caused by the internal resistance of the output switch in the closed state, thereby reducing current transport error between the coarse and fine memories.
REFERENCES:
patent: 4054864 (1977-10-01), Audaire et al.
patent: 5400273 (1995-03-01), Hughes et al.
Hughes John B.
Moulding Kenneth W.
Eason Leroy
Nelms David C.
Nguyen Hien
U.S. Philips Corporation
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