US PATENT SUBCLASS 330 / 129
.~ With control of input electrode or gain control electrode bias

Current as of: June, 1999
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330 /   HD   AMPLIFIERS

127  DF  WITH CONTROL OF POWER SUPPLY OR BIAS VOLTAGE {2}
129.~ With control of input electrode or gain control electrode bias {13}
130  DF  .~.~> Bias controlled by separate external control source
131  DF  .~.~> Control of bias on separate gain control electrode
132  DF  .~.~> Frequency selective means to select control signal from amplifier channel
133  DF  .~.~> Different bias control means for different stages of cascade amplifier
134  DF  .~.~> Plural different bias control voltages provided by separate means
135  DF  .~.~> Amplitude limiting or bias voltage
136  DF  .~.~> Bias control signal from input of amplifier
137  DF  .~.~> Oscillator supplies or controls bias
138  DF  .~.~> Bias controlled by biased rectifier or discharge device
139  DF  .~.~> Electronic tube controls bias
140  DF  .~.~> Rectifier in bias control circuit
141  DF  .~.~> Time constant circuit in bias control circuit
142  DF  .~.~> Cathode resistor supplies bias (e.g., self-biasing circuits)

DEFINITION

Classification: 330/129

(under subclass 127) Subject matter wherein the "means to control the bias voltage" is applied to an input electrode of the amplifying device, or to an electrode separate and distinct from the signal input electrodes and in vacuum tube amplifiers also separate and distinct from the anode or screen grid electrodes in order to control the bias of such electrode.

SEE OR SEARCH THIS CLASS, SUBCLASS:

9, for amplifiers having periodic switching input-output comparison.

11, for amplifiers with D.C.. reinsertion circuits.

52, for amplifiers have pilot frequency control means.

85, for signal feedback amplifiers having an amplifier in the feedback path including such feedback amplifiers having means to control the bias of an input or gain control electrode, thereof.

96, for amplifiers having signal feedback with means to control the bias voltage on an electrode of the signal amplifier. 123, for bias voltage control of input or gain control electrode in push-pull amplifiers.

254, and 278+, for semiconductor amplifiers having signal volume level control.

290, for semiconductor amplifiers having D.C.. feedback bias control for stabilization.

SEE OR SEARCH CLASS

323, Electricity: Power Supply or Regulation Systems,

227, and 291 for discharge control devices for voltage magnitude control including bias control means.

327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,

309+, for miscellaneous circuits including bias voltage control means for amplitude limiting.

333, Wave Transmission Lines and Networks,

14, 15 and 213+ for companders, pilot line controlled systems, and active element negative resistors or reactors, respectively including such subject matter with bias control means.

363, Electric Power Conversion Systems, appropriate subclasses for electrical conversion, including control of the line voltage. 455, Telecommunications,

234.1+, for automatic volume control in radio receivers; and subclass 343 for particular power or bias supply for radio receivers.