Coded data generation or conversion – Quantizer
Patent
1993-11-02
1995-12-26
Hoff, Marc S.
Coded data generation or conversion
Quantizer
341110, H03M 100
Patent
active
054791707
ABSTRACT:
A method and apparatus is described for refreshing the analog content of a analog memory having a volatile storage device. An analog value stored on a volatile storage device is iteratively adjusted to maintain the analog value in proximity to one of a set of predetermined discrete analog memory levels. Binary quantization of the stored value, yielding one bit of information corresponding to the analog value stored, determines whether to increase or decrease the stored value by a given small amount. In essence, the bit obtained by binary quantization encodes the direction toward the nearest discrete level. Memory retention achieved by periodic iteration of the method is robust to noise and random errors in the quantization, over a wide range of operating conditions. The apparatus includes as functional elements a binary quantizer and an increment/decrement refresh device, which may interface with the analog storage means in a variety of configurations, including configurations supporting multiplexed schemes for sharing quantizers and increment/decrement refresh devices among multiple storage cells.
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Cauwenberghs Gert
Yariv Amnon
California Institute of Technology
Hoff Marc S.
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