US Patent Class 330
AMPLIFIERS



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Current as of: June, 1999
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  DF  CLASS NOTES
1 R  DF  WITH DIVERSE-TYPE ART DEVICE
1 A  DF  .~ With process control system
2  DF  WITH AMPLIFIER CONDITION INDICATING OR TESTING MEANS
3  DF  WITH PLURAL DIVERSE-TYPE AMPLIFYING DEVICES
4  DF  WITH MASER-TYPE AMPLIFYING DEVICE
4.5  DF  PARAMETRIC AMPLIFIERS
4.6  DF  .~ Traveling wave type
4.7  DF  .~.~ Electron beam device
4.8  DF  .~ Gyromagnetic type (e.g., ferrite)
4.9  DF  .~ Semiconductor type (e.g., with semiconductor diode)
5  DF  WITH SOLID ELEMENT WAVE PROPAGATING AMPLIFYING DEVICE
5.5  DF  .~ Phonon type (e.g., ultrasonic wave propagating device)
6  DF  WITH HALL EFFECT TYPE MEANS
7  DF  WITH CAPACITIVE AMPLIFYING DEVICE
8  DF  WITH SATURABLE REACTOR-TYPE AMPLIFYING DEVICE
9  DF  WITH PERIODIC SWITCHING INPUT-OUTPUT (E.G., FOR DRIFT CORRECTION)
10  DF  MODULATOR-DEMODULATOR-TYPE AMPLIFIER
11  DF  WITH D.C. REINSERTION CIRCUIT
250  DF  WITH SEMICONDUCTOR AMPLIFYING DEVICE (E.G., TRANSISTOR)
251  DF  .~ Including Class D amplifier
252  DF  .~ Including differential amplifier
253  DF  .~.~ Having field effect transistor
254  DF  .~.~ Having gain control means
255  DF  .~.~ Having push-pull amplifier stage
256  DF  .~.~ Having temperature compensation means
257  DF  .~.~ Having current mirror amplifier
258  DF  .~.~ Having common mode rejection circuit
259  DF  .~.~ Having D.C. feedback bias control for stabilization
260  DF  .~.~ Having signal feedback means
261  DF  .~.~ Having particular biasing arrangement
262  DF  .~ Including push-pull amplifier
263  DF  .~.~ Having complementary symmetry
264  DF  .~.~.~ And field effect transistor
265  DF  .~.~.~ And feedback means
266  DF  .~.~.~ And temperature compensation
267  DF  .~.~.~ And particular biasing arrangement
268  DF  .~.~.~.~ To eliminate crossover distortion
269  DF  .~.~ Having field effect transistor
270  DF  .~.~ Having D.C. feedback bias control for stabilization
271  DF  .~.~ Having signal feedback means
272  DF  .~.~ Having temperature compensating means
273  DF  .~.~ Having particular biasing arrangement
274  DF  .~.~.~ To eliminate crossover distortion
275  DF  .~.~ Having balanced to unbalanced circuitry and vice versa
276  DF  .~.~ Having transformer
277  DF  .~ Including field effect transistor
278  DF  .~ Including gain control means
279  DF  .~.~ And significant control voltage developing means
280  DF  .~.~.~ With delay means
281  DF  .~.~.~ With time constant means
282  DF  .~.~ Having feedback means acting as variable impedance
283  DF  .~.~.~ Having emitter degeneration
284  DF  .~.~ Having attenuation means in signal transmission path
285  DF  .~.~ Having particular biasing means
286  DF  .~ Including distributed parameter-type coupling
287  DF  .~.~ Of diode type
288  DF  .~ Including current mirror amplifier
289  DF  .~ Including temperature compensation means
290  DF  .~ Including D.C. feedback bias control for stabilization
291  DF  .~ Including signal feedback means
292  DF  .~.~ Having compensation for interelectrode impedance
293  DF  .~.~ Having negative feedback
294  DF  .~.~ Having frequency-responsive means or phase-shift means in feedback path
295  DF  .~ Including plural amplifier channels
296  DF  .~ Including particular biasing arrangement
297  DF  .~ Including particular power supply circuitry
298  DF  .~ Including protection means
299  DF  .~ Including combined diverse-type semiconductor device
300  DF  .~.~ Bipolar or unipolar (FET)
301  DF  .~ Including balanced to unbalanced circuits and vice versa
302  DF  .~ Including frequency-responsive means in the signal transmission path
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
307  DF  .~ Integrated circuits
308  DF  .~ Including atomic particle or radiant energy impinging on a semiconductor
309  DF  .~ Involving structure of three diverse function electrode type
310  DF  .~ Including plural stages cascaded
311  DF  .~.~ Having different configurations
41  DF  WITH GAS OR VAPOR TUBE AMPLIFYING DEVICE
42  DF  WITH SECONDARY ELECTRON EMISSION TUBE AMPLIFYING DEVICE
43  DF  WITH TRAVELING WAVE-TYPE TUBE
44  DF  WITH ELECTRON BEAM TUBE AMPLIFYING DEVICE
45  DF  .~ Having electrode coupled to cavity resonator
46  DF  .~ Having deflecting means
47  DF  WITH MAGNETICALLY INFLUENCED DISCHARGE DEVICE (E.G., MAGNETRONS)
48  DF  .~ Having signal applied to magnetic means
49  DF  WITH VACUUM TUBE HAVING DISTRIBUTED PARAMETER IMPEDANCE CHARACTERISTICS
50  DF  WITH DUMMY TUBE
51  DF  COMBINED WITH AUTOMATIC AMPLIFIER DISABLING SWITCH MEANS
52  DF  WITH PILOT FREQUENCY CONTROL MEANS
53  DF  WITH DISTRIBUTED PARAMETER-TYPE COUPLING MEANS
54  DF  .~ Distributed amplifier
55  DF  .~ Push-pull
56  DF  .~ Waveguide, cavity, or concentric line resonator
57  DF  .~ Artificial line
58  DF  WITH ROTATING DYNAMOELECTRIC AMPLIFYING DEVICE
59  DF  HAVING LIGHT-CONTROLLED OR ACTIVATED DEVICE (I.E., NOT LIGHT SIGNAL)
60  DF  HAVING MAGNETOSTRICTIVE-TYPE AMPLIFYING DEVICE
61 R  DF  WITH RESISTIVE-TYPE AMPLIFYING DEVICE
62  DF  .~ Magnetoresistive type
61 A  DF  .~ Negative resistance amplifiers
63  DF  WITH MAGNETIC MEANS AMPLIFYING DEVICE
64  DF  WITH SPACE CHARGE GRID TUBE
65  DF  INVOLVING STRUCTURE OTHER THAN THAT OF TRANSFORMERS PER SE
66  DF  .~ With printed circuits
67  DF  .~ With capacitive structure
68  DF  .~ With shielding means
69  DF  SUM AND DIFFERENCE AMPLIFIERS
70  DF  ANODE ENERGIZED THROUGH DISCHARGE PATH OF CONTROLLED VACUUM TUBE
71  DF  .~ Plural discharge paths traversed by anode supply
72  DF  .~.~ Amplifier devices in arms of a bridge
73  DF  .~ Plural outputs
74  DF  .~ Separate signal inputs to series devices
75  DF  SIGNAL FEEDBACK
76  DF  .~ Compensating for inter-electrode impedance (e.g., neutralization)
77  DF  .~.~ At least one push-pull stage
78  DF  .~.~ To or from electrode common to input and output
79  DF  .~.~ By transformer feedback
80  DF  .~.~ By coil in parallel to and resonating with inter-electrode capacity
81  DF  .~ At least one push-pull signal stage
82  DF  .~.~ Positive and negative feedback
83  DF  .~.~ Including D.C. path for signal feedback
84  DF  .~ Plural amplifier channels
85  DF  .~ Amplifier in signal feedback path
86  DF  .~ Variable impedance in feedback path varied by separate control path
87  DF  .~ Cathode impedance feedback
88  DF  .~.~ Cascade amplifier stages with cathode-cathode feedback
89  DF  .~.~.~ Between adjacent stages
90  DF  .~.~ Combined with diverse-type feedback coupling
91  DF  .~.~.~ Diverse feedback to or from cathode
92  DF  .~.~.~.~ Feedback to cathode impedance of a prior stage
93  DF  .~.~.~ Including positive feedback
94  DF  .~.~ Frequency responsive means in cathode impedance feedback path
95  DF  .~.~ Nonlinear impedance means in cathode impedance feedback path
96  DF  .~ Combined with control of bias voltage of signal amplifier
97  DF  .~ Including D.C. path for signal feedback
98  DF  .~ In cascade amplifiers
99  DF  .~.~ Multiple feedback
100  DF  .~.~.~ A feedback to input of a prior stage
101  DF  .~ Positive and negative feedback in same path at different frequencies
102  DF  .~ Current and voltage feedback
103  DF  .~ Multiple feedback paths
104  DF  .~.~ Positive and negative feedback
105  DF  .~ From impedance in series with output load (e.g., current feedback)
106  DF  .~ In series with input source
107  DF  .~ Phase shift means in loop path
108  DF  .~ Potentiometer common to signal and feedback path
109  DF  .~ Frequency responsive feedback means
110  DF  .~ Nonlinear impedance element in loop path
111  DF  .~ To or from an auxiliary grid or to the anode
112  DF  .~ Positive feedback
113  DF  POLYPHASE POWER SUPPLY (I.E., FOR AN ELECTRODE, CATHODE HEATER, OR FILAMENT)
114  DF  UNRECTIFIED A.C. POWER SUPPLY FOR AN ELECTRODE (I.E., NOT THE HEATER)
115  DF  .~ Applied to filamentary cathode
116  DF  WITH BALANCED-TO-UNBALANCED COUPLING
117  DF  WITH UNBALANCED-TO-BALANCED COUPLING
118  DF  INCLUDING A PUSH-PULL STAGE
119  DF  .~ Coupling to or from cathode in push-pull
120  DF  .~ Interstage coupling between push-pull
121  DF  .~.~ D.C. coupling
122  DF  .~ Input and/or output coupling for push-pull
123  DF  .~ Power or bias supply circuits and control thereof
124 R  DF  WITH PLURAL AMPLIFIER CHANNELS (E.G., PARALLEL AMPLIFIER CHANNELS)
125  DF  .~ D.C. and A.C. amplifier channels
126  DF  .~ Amplifying different frequencies in different channels
124 D  DF  .~ Redundant amplifier circuits
127  DF  WITH CONTROL OF POWER SUPPLY OR BIAS VOLTAGE
128  DF  .~ Control means for anode of screen grid circuit
129  DF  .~ With control of input electrode or gain control electrode bias
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)
143  DF  THERMALLY RESPONSIVE IMPEDANCE
144  DF  VARIABLE IMPEDANCE FOR SIGNAL CHANNEL CONTROLLED BY SEPARATE CONTROL PATH
145  DF  .~ Electron tube or diode as impedance
146  DF  WHEATSTONE BRIDGE WITH AMPLIFIER IN AT LEAST ONE ARM
147  DF  PLURAL SIGNAL INPUTS
148  DF  PLURAL SIGNAL OUTPUTS
149  DF  HUM OR NOISE OR DISTORTION BUCKING INTRODUCED INTO SIGNAL CHANNEL
150  DF  CASCADED SIMILAR AMPLIFYING DEVICE OF DIFFERENT CHARACTERISTICS
151  DF  WITH AMPLIFIER BYPASS MEANS (E.G., FORWARD FEED)
152  DF  CASCADED DIFFERENTLY COUPLED BETWEEN STAGES
153  DF  .~ Including a cathode follower stage
154  DF  .~ Transformer or resonant circuit in interstage coupling (e.g., stagger tuning)
155  DF  UNICONTROL OF COUPLING OR THE CIRCUITS ASSOCIATED THEREWITH
156  DF  BOOTSTRAP COUPLING
157  DF  INTERSTAGE COUPLING
158  DF  .~ Coupling to cathode
159  DF  .~.~ D.C. coupling
160  DF  .~ Coupling to plate or auxiliary grid
161  DF  .~.~ D.C. coupling
162  DF  .~ Output coupling from grid
163  DF  .~.~ D.C. coupling
164  DF  .~ With electronic tube or diode in coupling circuit
165  DF  .~ Transformer coupling
166  DF  .~.~ With additional reactive coupling
167  DF  .~.~ With additional impedance connected to "P" or "S" circuits
168  DF  .~.~ From cathode
169  DF  .~.~ With means for adjusting inductive coupling
170  DF  .~.~ With shielding
171  DF  .~.~ With transformer structure
172  DF  .~ Coupling from cathode
173  DF  .~.~ D.C. coupling
174  DF  .~ With electromechanical transducer (e.g., piezoelectric crystal)
175  DF  .~ With lattice or Wheatstone bridge network in coupling circuits
176  DF  .~ With T, H, or Pi network in coupling circuit
177  DF  .~ With coupling or blocking capacitor
178  DF  .~.~ With R or L in series between stages
179  DF  .~.~ L in anode or grid circuit
180  DF  .~.~ With R in anode and grid circuit (RC coupling)
181  DF  .~ D.C. coupled
182  DF  .~.~ With series reactive element between stages
183  DF  .~.~ With nonlinear device
184  DF  .~.~ With series resistance between stages
185  DF  INPUT NETWORKS
186  DF  .~ To cathode
187  DF  .~.~ D.C. coupled
188  DF  .~ Transformer coupled
189  DF  .~.~ With additional impedance connected to "P" or "S" circuits
190  DF  .~.~ With transformer structure
191  DF  .~ D.C. coupled
192  DF  OUTPUT NETWORKS
193  DF  .~ From cathode
194  DF  .~.~ D.C. coupled
195  DF  .~ Transformer coupled
196  DF  .~.~ With additional impedance connected to "P" or "S" circuit
197  DF  .~.~ With transformer structure
198  DF  .~ D.C. coupled
199  DF  WITH POWER OR BIAS VOLTAGE SUPPLY
200  DF  .~ For plural stage amplifier
201  DF  .~.~ Filamentary cathodes heated by anode current or anode supply source
202  DF  .~ For anode
203  DF  .~.~ And input electrode
204  DF  .~ For input electrode
205  DF  .~.~ And filamentary cathode
206  DF  .~ For filamentary cathode
207 R  DF  MISCELLANEOUS
207 A  DF  .~ Class D
207 P  DF  .~ Amplifier protection means