US PATENT SUBCLASS 330 / 302
.~ Including frequency-responsive means in the signal transmission path

Current as of: June, 1999
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330 /   HD   AMPLIFIERS

250  DF  WITH SEMICONDUCTOR AMPLIFYING DEVICE (E.G., TRANSISTOR) {21}
302.~ Including frequency-responsive means in the signal transmission path {4}
303  DF  .~.~> Including an active device in the filter means
304  DF  .~.~> And equalizing means
305  DF  .~.~> And tuning means
306  DF  .~.~> And bandpass, broadband (e.g., wideband) or sidepass means

DEFINITION

Classification: 330/302

Including frequency-responsive means in the signal transmission path:

(under subclass 250) Subject matter including frequency-responsive means in the signal transmission path that causes corresponding changes in the amplifier gain.

SEE OR SEARCH THIS CLASS, SUBCLASS:

157+, 185+ and 192+, for interstage input or output coupling, respectively, including variable impedance means in such coupling.

294, 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,

113+, for miscellaneous frequency control, subclasses 231+ for a phase shift of less than an input signal period, subclasses 2+ for phase discriminating without subsequent control, and subclasses 39+ for frequency discriminating without subsequent control.

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