Subclass |
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ClassTitle
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AMPLIFIERS
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1R | | 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 |