US PATENT SUBCLASS 327 / 51
.~.~ With sensing amplifier

Current as of: June, 1999
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327 /   HD   MISCELLANEOUS ACTIVE ELECTRICAL NONLINEAR DEVICES, CIRCUITS, AND SYSTEMS

1  DF  SPECIFIC SIGNAL DISCRIMINATING (E.G., COMPARING, SELECTING, ETC.) WITHOUT SUBSEQUENT CONTROL {11}
50  DF  .~ By amplitude {9}
51.~.~ With sensing amplifier {2}
52  DF  .~.~.~> Differential amplifier {3}
57  DF  .~.~.~> With latching type element (e.g., flip-flop, etc.)

DEFINITION

Classification: 327/51

With sensing amplifier:

(under subclass 50) Subject matter wherein low-level voltages (e.g., CCD charges, capacitive stored signal levels, etc.) are detected and increased in magnitude from one level to another.

(1) Note. The voltage amplitude or storage charge levels detected in this subclass include the type of levels found in storage memory cells of an array; however, the static storage and retrieval of information coupled with the functions of "write", "read-out", "erase", etc., wherein voltage amplitude is sensed, is classified elsewhere. See the Search Note below.

(2) Note. Differential comparator type sensing amplifiers including regenerative sensing arrangements (e.g., bistable flip-flops) are classified in this subclass.

SEE OR SEARCH THIS CLASS, SUBCLASS:

28, for discrimination by polarity.

SEE OR SEARCH CLASS

365, Static Information Storage and Retrieval,

189.01+, for networks including the inserting, extracting, or handling of information signals using the functions of "write", "read-out", "erase", etc., subclasses 185.01+ for floating gate memory storage (e.g., flash memory); subclasses 189.01+ for the static storage and retrieval of information coupled with the functions of "write", "read-out", "erase", etc., wherein voltage amplitude is sensed.