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Class Information
Number: 330
Name: Amplifiers >
Description: (A) This is the generic class for amplifiers as limited by the definition of amplifiers as it appears in the Glossary below.










Class Number Class Name No. of Patents
330/70

Anode energized through discharge path of controlled vacuum tube

7
330/71

Plural discharge paths traversed by anode supply

4
330/72

Amplifier devices in arms of a bridge

1
330/73

Plural outputs

2
330/74

Separate signal inputs to series devices

0
330/156

Bootstrap coupling

42
330/152

Cascaded differently coupled between stages

5
330/153

Including a cathode follower stage

2
330/154

Transformer or resonant circuit in interstage coupling (e.g., stagger tuning)

8
330/150

Cascaded similar amplifying device of different characteristics

45
330/51

Combined with automatic amplifier disabling switch means

1002
330/59

Having light-controlled or activated device (i.e., not light signal)

222
330/60

Having magnetostrictive-type amplifying device

3
330/149

Hum or noise or distortion bucking introduced into signal channel

1516
330/118

Including a push-pull stage

25
330/119

Coupling to or from cathode in push-pull

7
330/122

Input and/or output coupling for push-pull

14
330/120

Interstage coupling between push-pull

5
330/121

D.c. coupling

3
330/123

Power or bias supply circuits and control thereof

29
330/185

Input networks

4
330/191

D.c. coupled

2
330/186

To cathode

2
330/187

D.c. coupled

1
330/188

Transformer coupled

27
330/189

With additional impedance connected to "p" or "s" circuits

8
330/190

With transformer structure

9
330/157

Interstage coupling

6
330/172

Coupling from cathode

3
330/173

D.c. coupling

2
330/158

Coupling to cathode

1
330/159

D.c. coupling

1
330/160

Coupling to plate or auxiliary grid

0
330/161

D.c. coupling

0
330/181

D.c. coupled

3
330/183

With nonlinear device

0
330/182

With series reactive element between stages

0
330/184

With series resistance between stages

1
330/162

Output coupling from grid

2
330/163

D.c. coupling

1
330/165

Transformer coupling

65
330/168

From cathode

0
330/167

With additional impedance connected to "p" or "s" circuits

8
330/166

With additional reactive coupling

7
330/169

With means for adjusting inductive coupling

3
330/170

With shielding

2
330/171

With transformer structure

13
330/177

With coupling or blocking capacitor

4
330/179

L in anode or grid circuit

1
330/180

With r in anode and grid circuit (rc coupling)

2
330/178

With r or l in series between stages

1
330/174

With electromechanical transducer (e.g., piezoelectric crystal)

31
330/164

With electronic tube or diode in coupling circuit

1
330/175

With lattice or wheatstone bridge network in coupling circuits

2
330/176

With t, h, or pi network in coupling circuit

2
330/65

Involving structure other than that of transformers per se

32
330/67

With capacitive structure

17
330/66

With printed circuits

76
330/68

With shielding means

34
330/207R

Miscellaneous

16
330/207P

Amplifier protection means

354
330/207A

Class d

587
330/10

Modulator-demodulator-type amplifier

1105
330/192

Output networks

10
330/198

D.c. coupled

0
330/193

From cathode

2
330/194

D.c. coupled

0
330/195

Transformer coupled

71
330/196

With additional impedance connected to "p" or "s" circuit

11
330/197

With transformer structure

7
330/4.5

Parametric amplifiers

38
330/4.8

Gyromagnetic type (e.g., ferrite)

1
330/4.9

Semiconductor type (e.g., with semiconductor diode)

36
330/4.6

Traveling wave type

21
330/4.7

Electron beam device

15
330/147

Plural signal inputs

62
330/148

Plural signal outputs

43
330/113

Polyphase power supply (i.e., for an electrode, cathode heater, or filament)

1
330/75

Signal feedback

49
330/85

Amplifier in signal feedback path

306
330/81

At least one push-pull signal stage

7
330/83

Including d.c. path for signal feedback

3
330/82

Positive and negative feedback

6
330/87

Cathode impedance feedback

2
330/88

Cascade amplifier stages with cathode-cathode feedback

6
330/89

Between adjacent stages

2
330/90

Combined with diverse-type feedback coupling

1
330/91

Diverse feedback to or from cathode

0
330/92

Feedback to cathode impedance of a prior stage

0
330/93

Including positive feedback

0
330/94

Frequency responsive means in cathode impedance feedback path

4
330/95

Nonlinear impedance means in cathode impedance feedback path

3
330/96

Combined with control of bias voltage of signal amplifier

21
330/76

Compensating for inter-electrode impedance (e.g., neutralization)

12
330/77

At least one push-pull stage

5
330/80

By coil in parallel to and resonating with inter-electrode capacity

2
330/79

By transformer feedback

15
330/78

To or from electrode common to input and output

3
330/102

Current and voltage feedback

33
330/109

Frequency responsive feedback means

284
330/105

From impedance in series with output load (e.g., current feedback)

34
330/98

In cascade amplifiers

132
330/99

Multiple feedback

59
330/100

A feedback to input of a prior stage

69
330/106

In series with input source

4
330/97

Including d.c. path for signal feedback

12
330/103

Multiple feedback paths

74
330/104

Positive and negative feedback

43
330/110

Nonlinear impedance element in loop path

194
330/107

Phase shift means in loop path

445
330/84

Plural amplifier channels

155
330/101

Positive and negative feedback in same path at different frequencies

9
330/112

Positive feedback

31
330/108

Potentiometer common to signal and feedback path

32
330/111

To or from an auxiliary grid or to the anode

0
330/86

Variable impedance in feedback path varied by separate control path

337
330/69

Sum and difference amplifiers

469
330/143

Thermally responsive impedance

18
330/155

Unicontrol of coupling or the circuits associated therewith

4
330/114

Unrectified a.c. power supply for an electrode (i.e., not the heater)

0
330/115

Applied to filamentary cathode

0
330/144

Variable impedance for signal channel controlled by separate control path

134
330/145

Electron tube or diode as impedance

91
330/146

Wheatstone bridge with amplifier in at least one arm

130
330/151

With amplifier bypass means (e.g., forward feed)

591
330/2

With amplifier condition indicating or testing means

305
330/116

With balanced-to-unbalanced coupling

13
330/7

With capacitive amplifying device

9
330/127

With control of power supply or bias voltage

245
330/128

Control means for anode of screen grid circuit

13
330/129

With control of input electrode or gain control electrode bias

566
330/135

Amplitude limiting or bias voltage

36
330/136

Bias control signal from input of amplifier

513
330/138

Bias controlled by biased rectifier or discharge device

56
330/130

Bias controlled by separate external control source

31
330/142

Cathode resistor supplies bias (e.g., self-biasing circuits)

1
330/131

Control of bias on separate gain control electrode

14
330/133

Different bias control means for different stages of cascade amplifier

266
330/139

Electronic tube controls bias

12
330/132

Frequency selective means to select control signal from amplifier channel

35
330/137

Oscillator supplies or controls bias

29
330/134

Plural different bias control voltages provided by separate means

144
330/140

Rectifier in bias control circuit

113
330/141

Time constant circuit in bias control circuit

104
330/11

With d.c. reinsertion circuit

48
330/53

With distributed parameter-type coupling means

164
330/57

Artificial line

3
330/54

Distributed amplifier

133
330/55

Push-pull

19
330/56

Waveguide, cavity, or concentric line resonator

77
330/1R

With diverse-type art device

8
330/1A

With process control system

7
330/50

With dummy tube

3
330/44

With electron beam tube amplifying device

43
330/46

Having deflecting means

6
330/45

Having electrode coupled to cavity resonator

59
330/41

With gas or vapor tube amplifying device

5
330/6

With hall effect type means

23
330/63

With magnetic means amplifying device

7
330/47

With magnetically influenced discharge device (e.g., magnetrons)

12
330/48

Having signal applied to magnetic means

4
330/4

With maser-type amplifying device

24
330/9

With periodic switching input-output (e.g., for drift correction)

905
330/52

With pilot frequency control means

158
330/124R

With plural amplifier channels (e.g., parallel amplifier channels)

978
330/126

Amplifying different frequencies in different channels

223
330/125

D.c. and a.c. amplifier channels

10
330/124D

Redundant amplifier circuits

109
330/3

With plural diverse-type amplifying devices

31
330/199

With power or bias voltage supply

51
330/202

For anode

27
330/203

And input electrode

2
330/206

For filamentary cathode

3
330/204

For input electrode

2
330/205

And filamentary cathode

0
330/200

For plural stage amplifier

17
330/201

Filamentary cathodes heated by anode current or anode supply source

0
330/61R

With resistive-type amplifying device

10
330/62

Magnetoresistive type

6
330/61A

Negative resistance amplifiers

18
330/58

With rotating dynamoelectric amplifying device

2
330/8

With saturable reactor-type amplifying device

20
330/42

With secondary electron emission tube amplifying device

12
330/250

With semiconductor amplifying device (e.g., transistor)

83
330/308

Including atomic particle or radiant energy impinging on a semiconductor

487
330/301

Including balanced to unbalanced circuits and vice versa

244
330/251

Including class d amplifier

807
330/299

Including combined diverse-type semiconductor device

40
330/300

Bipolar or unipolar (fet)

259
330/288

Including current mirror amplifier

763
330/290

Including d.c. feedback bias control for stabilization

171
330/252

Including differential amplifier

834
330/258

Having common mode rejection circuit

721
330/257

Having current mirror amplifier

1016
330/259

Having d.c. feedback bias control for stabilization

344
330/253

Having field effect transistor

1636
330/254

Having gain control means

1021
330/261

Having particular biasing arrangement

932
330/255

Having push-pull amplifier stage

699
330/260

Having signal feedback means

841
330/256

Having temperature compensation means

182
330/286

Including distributed parameter-type coupling

531
330/287

Of diode type

59
330/277

Including field effect transistor

793
330/302

Including frequency-responsive means in the signal transmission path

699
330/306

And bandpass, broadband (e.g., wideband) or sidepass means

358
330/304

And equalizing means

114
330/305

And tuning means

261
330/303

Including an active device in the filter means

127
330/278

Including gain control means

508
330/279

And significant control voltage developing means

619
330/280

With delay means

88
330/281

With time constant means

107
330/284

Having attenuation means in signal transmission path

522
330/282

Having feedback means acting as variable impedance

360
330/283

Having emitter degeneration

133
330/285

Having particular biasing means

704
330/296

Including particular biasing arrangement

994
330/297

Including particular power supply circuitry

786
330/295

Including plural amplifier channels

1090
330/310

Including plural stages cascaded

507
330/311

Having different configurations

736
330/298

Including protection means

482
330/262

Including push-pull amplifier

94
330/275

Having balanced to unbalanced circuitry and vice versa

46
330/263

Having complementary symmetry

187
330/265

And feedback means

191
330/264

And field effect transistor

321
330/267

And particular biasing arrangement

385
330/268

To eliminate crossover distortion

103
330/266

And temperature compensation

41
330/270

Having d.c. feedback bias control for stabilization

44
330/269

Having field effect transistor

116
330/273

Having particular biasing arrangement

108
330/274

To eliminate crossover distortion

36
330/271

Having signal feedback means

65
330/272

Having temperature compensating means

33
330/276

Having transformer

112
330/291

Including signal feedback means

163
330/292

Having compensation for interelectrode impedance

248
330/294

Having frequency-responsive means or phase-shift means in feedback path

321
330/293

Having negative feedback

202
330/289

Including temperature compensation means

423
330/307

Integrated circuits

469
330/309

Involving structure of three diverse function electrode type

7
330/5

With solid element wave propagating amplifying device

22
330/5.5

Phonon type (e.g., ultrasonic wave propagating device)

22
330/64

With space charge grid tube

1
330/43

With traveling wave-type tube

109
330/117

With unbalanced-to-balanced coupling

19
330/49

With vacuum tube having distributed parameter impedance characteristics

8
 
 
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