US PATENT SUBCLASS 327 / 205
.~.~.~ Using hysteresis (e.g., Schmitt trigger, etc.)

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

100  DF  SIGNAL CONVERTING, SHAPING, OR GENERATING {29}
185  DF  .~ Particular stable state circuit (e.g., tristable, etc.) {12}
199  DF  .~.~ Circuit having only two stable states (i.e., bistable) {11}
205.~.~.~ Using hysteresis (e.g., Schmitt trigger, etc.) {1}
206  DF  .~.~.~.~> Including field-effect transistor

DEFINITION

Classification: 327/205

Using hysteresis (e.g., Schmitt trigger, etc.):

(under subclass 199) Subject matter wherein the input voltage required to cause a change from a first stable state to a second stable state is distinctly different from that required to cause a subsequent change from the second stable state to the first stable state as a result of feedback.

(1) Note. Electronic digital logic circuits which may utilize hysteresis for noise margin enhancement are classified with the logic circuits in Class 326.

SEE OR SEARCH THIS CLASS, SUBCLASS:

72+, for analogous circuitry recited as an amplitude comparator wherein an input is compared to a reference derived therefrom.

74+, for an input signal compared to plural fixed references.

SEE OR SEARCH CLASS

326, Electronic Digital Logic Circuits, 22, for input noise margin enhancement logic circuits which may utilize similar circuits.