| Subclass |
| Title |
|---|
|
ClassTitle
|
| ===>
AMPLIFIERS
|
| | | |
| 1R | ![[Patents]](../gifs/ps.gif) | WITH DIVERSE-TYPE ART DEVICE |
| 1A | | . With process control system |
| 2 | | WITH AMPLIFIER CONDITION INDICATING OR TESTING MEANS |
| 3 | | WITH PLURAL DIVERSE-TYPE AMPLIFYING DEVICES |
| 4 | | WITH MASER-TYPE AMPLIFYING DEVICE |
| 4.5 | | PARAMETRIC AMPLIFIERS |
| 4.6 | | . Traveling wave type |
| 4.7 | | . . Electron beam device |
| 4.8 | | . Gyromagnetic type (e.g., ferrite) |
| 4.9 | | . Semiconductor type (e.g., with semiconductor diode) |
| 5 | | WITH SOLID ELEMENT WAVE PROPAGATING AMPLIFYING DEVICE |
| 5.5 | | . Phonon type (e.g., ultrasonic wave propagating device) |
| 6 | | WITH HALL EFFECT TYPE MEANS |
| 7 | | WITH CAPACITIVE AMPLIFYING DEVICE |
| 8 | | WITH SATURABLE REACTOR-TYPE AMPLIFYING DEVICE |
| 9 | | WITH PERIODIC SWITCHING INPUT-OUTPUT (E.G., FOR DRIFT CORRECTION) |
| 10 | | MODULATOR-DEMODULATOR-TYPE AMPLIFIER |
| 11 | | WITH D.C. REINSERTION CIRCUIT |
| 250 | | WITH SEMICONDUCTOR AMPLIFYING DEVICE (E.G., TRANSISTOR) |
| 251 | | . Including Class D amplifier |
| 252 | | . Including differential amplifier |
| 253 | | . . Having field effect transistor |
| 254 | | . . Having gain control means |
| 255 | | . . Having push-pull amplifier stage |
| 256 | | . . Having temperature compensation means |
| 257 | | . . Having current mirror amplifier |
| 258 | | . . Having common mode rejection circuit |
| 259 | | . . Having D.C. feedback bias control for stabilization |
| 260 | | . . Having signal feedback means |
| 261 | | . . Having particular biasing arrangement |
| 262 | | . Including push-pull amplifier |
| 263 | | . . Having complementary symmetry |
| 264 | | . . . And field effect transistor |
| 265 | | . . . And feedback means |
| 266 | | . . . And temperature compensation |
| 267 | | . . . And particular biasing arrangement |
| 268 | | . . . . To eliminate crossover distortion |
| 269 | | . . Having field effect transistor |
| 270 | | . . Having D.C. feedback bias control for stabilization |
| 271 | | . . Having signal feedback means |
| 272 | | . . Having temperature compensating means |
| 273 | | . . Having particular biasing arrangement |
| 274 | | . . . To eliminate crossover distortion |
| 275 | | . . Having balanced to unbalanced circuitry and vice versa |
| 276 | | . . Having transformer |
| 277 | | . Including field effect transistor |
| 278 | | . Including gain control means |
| 279 | | . . And significant control voltage developing means |
| 280 | | . . . With delay means |
| 281 | | . . . With time constant means |
| 282 | | . . Having feedback means acting as variable impedance |
| 283 | | . . . Having emitter degeneration |
| 284 | | . . Having attenuation means in signal transmission path |
| 285 | | . . Having particular biasing means |
| 286 | | . Including distributed parameter-type coupling |
| 287 | | . . Of diode type |
| 288 | | . Including current mirror amplifier |
| 289 | | . Including temperature compensation means |
| 290 | | . Including D.C. feedback bias control for stabilization |
| 291 | | . Including signal feedback means |
| 292 | | . . Having compensation for interelectrode impedance |
| 293 | | . . Having negative feedback |
| 294 | | . . Having frequency-responsive means or phase-shift means in feedback path |
| 295 | | . Including plural amplifier channels |
| 296 | | . Including particular biasing arrangement |
| 297 | | . Including particular power supply circuitry |
| 298 | | . Including protection means |
| 299 | | . Including combined diverse-type semiconductor device |
| 300 | | . . Bipolar or unipolar (FET) |
| 301 | | . Including balanced to unbalanced circuits and vice versa |
| 302 | | . Including frequency-responsive means in the signal transmission path |
| 303 | | . . Including an active device in the filter means |
| 304 | | . . And equalizing means |
| 305 | | . . And tuning means |
| 306 | | . . And bandpass, broadband (e.g., wideband) or sidepass means |
| 307 | | . Integrated circuits |
| 308 | | . Including atomic particle or radiant energy impinging on a semiconductor |
| 309 | | . Involving structure of three diverse function electrode type |
| 310 | | . Including plural stages cascaded |
| 311 | | . . Having different configurations |
| 41 | | WITH GAS OR VAPOR TUBE AMPLIFYING DEVICE |
| 42 | | WITH SECONDARY ELECTRON EMISSION TUBE AMPLIFYING DEVICE |
| 43 | | WITH TRAVELING WAVE-TYPE TUBE |
| 44 | | WITH ELECTRON BEAM TUBE AMPLIFYING DEVICE |
| 45 | | . Having electrode coupled to cavity resonator |
| 46 | | . Having deflecting means |
| 47 | | WITH MAGNETICALLY INFLUENCED DISCHARGE DEVICE (E.G., MAGNETRONS) |
| 48 | | . Having signal applied to magnetic means |
| 49 | | WITH VACUUM TUBE HAVING DISTRIBUTED PARAMETER IMPEDANCE CHARACTERISTICS |
| 50 | | WITH DUMMY TUBE |
| 51 | | COMBINED WITH AUTOMATIC AMPLIFIER DISABLING SWITCH MEANS |
| 52 | | WITH PILOT FREQUENCY CONTROL MEANS |
| 53 | | WITH DISTRIBUTED PARAMETER-TYPE COUPLING MEANS |
| 54 | | . Distributed amplifier |
| 55 | | . Push-pull |
| 56 | | . Waveguide, cavity, or concentric line resonator |
| 57 | | . Artificial line |
| 58 | | WITH ROTATING DYNAMOELECTRIC AMPLIFYING DEVICE |
| 59 | | HAVING LIGHT-CONTROLLED OR ACTIVATED DEVICE (I.E., NOT LIGHT SIGNAL) |
| 60 | | HAVING MAGNETOSTRICTIVE-TYPE AMPLIFYING DEVICE |
| 61R | | WITH RESISTIVE-TYPE AMPLIFYING DEVICE |
| 62 | | . Magnetoresistive type |
| 61A | | . Negative resistance amplifiers |
| 63 | | WITH MAGNETIC MEANS AMPLIFYING DEVICE |
| 64 | | WITH SPACE CHARGE GRID TUBE |
| 65 | | INVOLVING STRUCTURE OTHER THAN THAT OF TRANSFORMERS PER SE |
| 66 | | . With printed circuits |
| 67 | | . With capacitive structure |
| 68 | | . With shielding means |
| 69 | | SUM AND DIFFERENCE AMPLIFIERS |
| 70 | | ANODE ENERGIZED THROUGH DISCHARGE PATH OF CONTROLLED VACUUM TUBE |
| 71 | | . Plural discharge paths traversed by anode supply |
| 72 | | . . Amplifier devices in arms of a bridge |
| 73 | | . Plural outputs |
| 74 | | . Separate signal inputs to series devices |
| 75 | | SIGNAL FEEDBACK |
| 76 | | . Compensating for inter-electrode impedance (e.g., neutralization) |
| 77 | | . . At least one push-pull stage |
| 78 | | . . To or from electrode common to input and output |
| 79 | | . . By transformer feedback |
| 80 | | . . By coil in parallel to and resonating with inter-electrode capacity |
| 81 | | . At least one push-pull signal stage |
| 82 | | . . Positive and negative feedback |
| 83 | | . . Including D.C. path for signal feedback |
| 84 | | . Plural amplifier channels |
| 85 | | . Amplifier in signal feedback path |
| 86 | | . Variable impedance in feedback path varied by separate control path |
| 87 | | . Cathode impedance feedback |
| 88 | | . . Cascade amplifier stages with cathode-cathode feedback |
| 89 | | . . . Between adjacent stages |
| 90 | | . . Combined with diverse-type feedback coupling |
| 91 | | . . . Diverse feedback to or from cathode |
| 92 | | . . . . Feedback to cathode impedance of a prior stage |
| 93 | | . . . Including positive feedback |
| 94 | | . . Frequency responsive means in cathode impedance feedback path |
| 95 | | . . Nonlinear impedance means in cathode impedance feedback path |
| 96 | | . Combined with control of bias voltage of signal amplifier |
| 97 | | . Including D.C. path for signal feedback |
| 98 | | . In cascade amplifiers |
| 99 | | . . Multiple feedback |
| 100 | | . . . A feedback to input of a prior stage |
| 101 | | . Positive and negative feedback in same path at different frequencies |
| 102 | | . Current and voltage feedback |
| 103 | | . Multiple feedback paths |
| 104 | | . . Positive and negative feedback |
| 105 | | . From impedance in series with output load (e.g., current feedback) |
| 106 | | . In series with input source |
| 107 | | . Phase shift means in loop path |
| 108 | | . Potentiometer common to signal and feedback path |
| 109 | | . Frequency responsive feedback means |
| 110 | | . Nonlinear impedance element in loop path |
| 111 | | . To or from an auxiliary grid or to the anode |
| 112 | | . Positive feedback |
| 113 | | POLYPHASE POWER SUPPLY (I.E., FOR AN ELECTRODE, CATHODE HEATER, OR FILAMENT) |
| 114 | | UNRECTIFIED A.C. POWER SUPPLY FOR AN ELECTRODE (I.E., NOT THE HEATER) |
| 115 | | . Applied to filamentary cathode |
| 116 | | WITH BALANCED-TO-UNBALANCED COUPLING |
| 117 | | WITH UNBALANCED-TO-BALANCED COUPLING |
| 118 | | INCLUDING A PUSH-PULL STAGE |
| 119 | | . Coupling to or from cathode in push-pull |
| 120 | | . Interstage coupling between push-pull |
| 121 | | . . D.C. coupling |
| 122 | | . Input and/or output coupling for push-pull |
| 123 | | . Power or bias supply circuits and control thereof |
| 124R | | WITH PLURAL AMPLIFIER CHANNELS (E.G., PARALLEL AMPLIFIER CHANNELS) |
| 125 | | . D.C. and A.C. amplifier channels |
| 126 | | . Amplifying different frequencies in different channels |
| 124D | | . Redundant amplifier circuits |
| 127 | | WITH CONTROL OF POWER SUPPLY OR BIAS VOLTAGE |
| 128 | | . Control means for anode of screen grid circuit |
| 129 | | . With control of input electrode or gain control electrode bias |
| 130 | | . . Bias controlled by separate external control source |
| 131 | | . . Control of bias on separate gain control electrode |
| 132 | | . . Frequency selective means to select control signal from amplifier channel |
| 133 | | . . Different bias control means for different stages of cascade amplifier |
| 134 | | . . Plural different bias control voltages provided by separate means |
| 135 | | . . Amplitude limiting or bias voltage |
| 136 | | . . Bias control signal from input of amplifier |
| 137 | | . . Oscillator supplies or controls bias |
| 138 | | . . Bias controlled by biased rectifier or discharge device |
| 139 | | . . Electronic tube controls bias |
| 140 | | . . Rectifier in bias control circuit |
| 141 | | . . Time constant circuit in bias control circuit |
| 142 | | . . Cathode resistor supplies bias (e.g., self-biasing circuits) |
| 143 | | THERMALLY RESPONSIVE IMPEDANCE |
| 144 | | VARIABLE IMPEDANCE FOR SIGNAL CHANNEL CONTROLLED BY SEPARATE CONTROL PATH |
| 145 | | . Electron tube or diode as impedance |
| 146 | | WHEATSTONE BRIDGE WITH AMPLIFIER IN AT LEAST ONE ARM |
| 147 | | PLURAL SIGNAL INPUTS |
| 148 | | PLURAL SIGNAL OUTPUTS |
| 149 | | HUM OR NOISE OR DISTORTION BUCKING INTRODUCED INTO SIGNAL CHANNEL |
| 150 | | CASCADED SIMILAR AMPLIFYING DEVICE OF DIFFERENT CHARACTERISTICS |
| 151 | | WITH AMPLIFIER BYPASS MEANS (E.G., FORWARD FEED) |
| 152 | | CASCADED DIFFERENTLY COUPLED BETWEEN STAGES |
| 153 | | . Including a cathode follower stage |
| 154 | | . Transformer or resonant circuit in interstage coupling (e.g., stagger tuning) |
| 155 | | UNICONTROL OF COUPLING OR THE CIRCUITS ASSOCIATED THEREWITH |
| 156 | | BOOTSTRAP COUPLING |
| 157 | | INTERSTAGE COUPLING |
| 158 | | . Coupling to cathode |
| 159 | | . . D.C. coupling |
| 160 | | . Coupling to plate or auxiliary grid |
| 161 | | . . D.C. coupling |
| 162 | | . Output coupling from grid |
| 163 | | . . D.C. coupling |
| 164 | | . With electronic tube or diode in coupling circuit |
| 165 | | . Transformer coupling |
| 166 | | . . With additional reactive coupling |
| 167 | | . . With additional impedance connected to "P" or "S" circuits |
| 168 | | . . From cathode |
| 169 | | . . With means for adjusting inductive coupling |
| 170 | | . . With shielding |
| 171 | | . . With transformer structure |
| 172 | | . Coupling from cathode |
| 173 | | . . D.C. coupling |
| 174 | | . With electromechanical transducer (e.g., piezoelectric crystal) |
| 175 | | . With lattice or Wheatstone bridge network in coupling circuits |
| 176 | | . With T, H, or Pi network in coupling circuit |
| 177 | | . With coupling or blocking capacitor |
| 178 | | . . With R or L in series between stages |
| 179 | | . . L in anode or grid circuit |
| 180 | | . . With R in anode and grid circuit (RC coupling) |
| 181 | | . D.C. coupled |
| 182 | | . . With series reactive element between stages |
| 183 | | . . With nonlinear device |
| 184 | | . . With series resistance between stages |
| 185 | | INPUT NETWORKS |
| 186 | | . To cathode |
| 187 | | . . D.C. coupled |
| 188 | | . Transformer coupled |
| 189 | | . . With additional impedance connected to "P" or "S" circuits |
| 190 | | . . With transformer structure |
| 191 | | . D.C. coupled |
| 192 | | OUTPUT NETWORKS |
| 193 | | . From cathode |
| 194 | | . . D.C. coupled |
| 195 | | . Transformer coupled |
| 196 | | . . With additional impedance connected to "P" or "S" circuit |
| 197 | | . . With transformer structure |
| 198 | | . D.C. coupled |
| 199 | | WITH POWER OR BIAS VOLTAGE SUPPLY |
| 200 | | . For plural stage amplifier |
| 201 | | . . Filamentary cathodes heated by anode current or anode supply source |
| 202 | | . For anode |
| 203 | | . . And input electrode |
| 204 | | . For input electrode |
| 205 | | . . And filamentary cathode |
| 206 | | . For filamentary cathode |
| 207R | | MISCELLANEOUS |
| 207A | | . Class D |
| 207P | | . Amplifier protection means |
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