US PATENT SUBCLASS 330 / 303
.~.~ Including an active device in the filter means

Current as of: June, 1999
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330 /   HD   AMPLIFIERS

250  DF  WITH SEMICONDUCTOR AMPLIFYING DEVICE (E.G., TRANSISTOR) {21}
302  DF  .~ Including frequency-responsive means in the signal transmission path {4}
303.~.~ Including an active device in the filter means

DEFINITION

Classification: 330/303

Including an active device in the filter means:

(under subclass 302) Subject matter including a transistor or active diode in the filter network.

SEE OR SEARCH THIS CLASS, SUBCLASS:

107, 109 and 294, for circuits having frequency-responsive means or phase-shift means in the feedback path.

SEE OR SEARCH CLASS

327, Miscellaneous Active Electrical Nonlinear Devices,

Circuits, and Systems,

552+, for miscellaneous circuits suppressing an unwanted signal using an active filter.

333, Wave Transmission Lines and Networks, 24+, for frequency or phase sensitive circuits in wave transmission lines and networks.