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 | DF | .~.~ With sensing amplifier {2} |
52 | DF | .~.~.~ Differential amplifier {3} |
54 | DF | .~.~.~.~ Having feedback {1} |
55 | .~.~.~.~.~ Cross-coupled |