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IPC-Stelle: H03F 3/347 3-Punkt Untergruppe [Version 2010.01, Sprache EN - English]

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Symbol		Titel
A Hierarchieinformationen		SECTION A — HUMAN NECESSITIES
B Hierarchieinformationen		SECTION B — PERFORMING OPERATIONS; TRANSPORTING
C Hierarchieinformationen		SECTION C — CHEMISTRY; METALLURGY
D Hierarchieinformationen		SECTION D — TEXTILES; PAPER
E Hierarchieinformationen		SECTION E — FIXED CONSTRUCTIONS
F Hierarchieinformationen		SECTION F — MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
G Hierarchieinformationen		SECTION G — PHYSICS
H Hierarchieinformationen		SECTION H — ELECTRICITY
H01 Hierarchieinformationen		BASIC ELECTRIC ELEMENTS
H02 Hierarchieinformationen		GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
H03 Hierarchieinformationen		BASIC ELECTRONIC CIRCUITRY
H03B Hierarchieinformationen		GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS (measuring, testing G01R; generators adapted for electrophonic musical instruments G10H; speech synthesis G10L 13/00; masers, lasers H01S; dynamo-electric machines H02K; power inverter circuits H02M; by using pulse techniques H03K; automatic control of generators H03L; starting, synchronisation or stabilisation of generators where the type of generator is irrelevant or unspecified H03L; generation of oscillations in plasma H05H)
H03C Hierarchieinformationen		MODULATION (measuring, testing G01R; masers, lasers H01S; modulators specially adapted for use in dc amplifiers H03F 3/38; modulating pulses H03K 7/00; so-called modulators capable only of switching between predetermined states of amplitude, frequency or phase H03K 17/00, H04L; coding, decoding or code conversion, in general H03M; synchronous modulators specially adapted for colour television H04N 9/65)
H03D Hierarchieinformationen		DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER (masers, lasers H01S; circuits capable of acting both as modulator and demodulator H03C; details applicable to both modulators and frequency-changers H03C; demodulating pulses H03K 9/00; transforming types of pulse modulation H03K 11/00; coding, decoding or code conversion, in general H03M; repeater stations H04B 7/14; demodulators adapted for digitally modulated-carrier systems H04L 27/00; synchronous demodulators adapted for colour television H04N 9/66)
H03F Hierarchieinformationen		AMPLIFIERS (measuring, testing G01R; optical parametric amplifiers G02F; circuit arrangements with secondary emission tubes H01J 43/30; masers, lasers H01S; dynamo-electric amplifiers H02K; control of amplification H03G; coupling arrangements independent of the nature of the amplifier, voltage dividers H03H; amplifiers capable only of dealing with pulses H03K; repeater circuits in transmission lines H04B 3/36, H04B 3/58; application of speech amplifiers in telephonic communication H04M 1/60, H04M 3/40)
H03F 1/00 Hierarchieinformationen		Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
H03F 3/00 Hierarchieinformationen		Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
H03F 3/02 Hierarchieinformationen		. with tubes only (subsequent subgroups take precedence)
H03F 3/04 Hierarchieinformationen		. with semiconductor devices only (subsequent subgroups take precedence)
H03F 3/06 Hierarchieinformationen		. . using hole storage effect
H03F 3/08 Hierarchieinformationen		. . controlled by light
H03F 3/10 Hierarchieinformationen		. . with diodes
H03F 3/12 Hierarchieinformationen		. . . with Esaki diodes
H03F 3/14 Hierarchieinformationen		. . with amplifying devices having more than three electrodes or more than two PN junctions
H03F 3/16 Hierarchieinformationen		. . with field-effect devices
H03F 3/18 Hierarchieinformationen		. with semiconductor devices of complementary types (subsequent subgroups take precedence)
H03F 3/181 Hierarchieinformationen		. Low-frequency amplifiers, e.g. audio preamplifiers [2]
H03F 3/183 Hierarchieinformationen		. . with semiconductor devices only [2]
H03F 3/185 Hierarchieinformationen		. . . with field-effect devices (H03F 3/187 takes precedence) [2]
H03F 3/187 Hierarchieinformationen		. . . in integrated circuits [2]
H03F 3/189 Hierarchieinformationen		. High-frequency amplifiers, e.g. radio frequency amplifiers [2]
H03F 3/19 Hierarchieinformationen		. . with semiconductor devices only [2]
H03F 3/191 Hierarchieinformationen		. . . Tuned amplifiers (H03F 3/193, H03F 3/195 take precedence) [2]
H03F 3/193 Hierarchieinformationen		. . . with field-effect devices (H03F 3/195 takes precedence) [2]
H03F 3/195 Hierarchieinformationen		. . . in integrated circuits [2]
H03F 3/20 Hierarchieinformationen		. Power amplifiers, e.g. Class B amplifiers, Class C amplifiers (H03F 3/26-H03F 3/30 take precedence)
H03F 3/21 Hierarchieinformationen		. . with semiconductor devices only [2]
H03F 3/213 Hierarchieinformationen		. . . in integrated circuits [2]
H03F 3/217 Hierarchieinformationen		. . . Class D power amplifiers; Switching amplifiers [2]
H03F 3/22 Hierarchieinformationen		. . with tubes only (H03F 3/24 takes precedence)
H03F 3/24 Hierarchieinformationen		. . of transmitter output stages
H03F 3/26 Hierarchieinformationen		. Push-pull amplifiers; Phase-splitters therefor (duplicated single-ended push-pull arrangements or phase-splitters therefor H03F 3/30)
H03F 3/28 Hierarchieinformationen		. . with tubes only
H03F 3/30 Hierarchieinformationen		. Single-ended push-pull amplifiers; Phase-splitters therefor
H03F 3/32 Hierarchieinformationen		. . with tubes only
H03F 3/34 Hierarchieinformationen		. Dc amplifiers in which all stages are dc-coupled (H03F 3/45 takes precedence) [3]
H03F 3/343 Hierarchieinformationen		. . with semiconductor devices only [2]
H03F 3/345 Hierarchieinformationen		. . . with field-effect devices (H03F 3/347 takes precedence) [2]
H03F 3/347 Hierarchieinformationen		. . . in integrated circuits [2]
H03F 3/36 Hierarchieinformationen		. . with tubes only
H03F 3/38 Hierarchieinformationen		. Dc amplifiers with modulator at input and demodulator at output; Modulators or demodulators specially adapted for use in such amplifiers (modulators in general H03C; demodulators in general H03D; amplitude modulation of pulses in general H03K 7/02; amplitude demodulation of pulses in general H03K 9/02)
H03F 3/387 Hierarchieinformationen		. . with semiconductor devices only [2]
H03F 3/393 Hierarchieinformationen		. . . with field-effect devices [2]
H03F 3/40 Hierarchieinformationen		. . with tubes only
H03F 3/42 Hierarchieinformationen		. Amplifiers with two or more amplifying elements having their dc paths in series with the load, the control electrode of each element being excited by at least part of the input signal, e.g. so-called totem-pole amplifiers
H03F 3/44 Hierarchieinformationen		. . with tubes only
H03F 3/45 Hierarchieinformationen		. Differential amplifiers [2]
H03F 3/46 Hierarchieinformationen		. Reflex amplifiers
H03F 3/48 Hierarchieinformationen		. . with tubes only
H03F 3/50 Hierarchieinformationen		. Amplifiers in which input is applied to, or output is derived from, an impedance common to input and output circuits of the amplifying element, e.g. cathode follower
H03F 3/52 Hierarchieinformationen		. . with tubes only
H03F 3/54 Hierarchieinformationen		. Amplifiers using transit-time effect in tubes or semiconductor devices (parametric amplifiers H03F 7/00; solid state travelling-wave devices H01L 45/02)
H03F 3/55 Hierarchieinformationen		. . with semiconductor devices only [2]
H03F 3/56 Hierarchieinformationen		. . using klystrons
H03F 3/58 Hierarchieinformationen		. . using travelling-wave tubes
H03F 3/60 Hierarchieinformationen		. Amplifiers in which coupling networks have distributed constants, e.g. with waveguide resonators (H03F 3/54 takes precedence)
H03F 3/62 Hierarchieinformationen		. Two-way amplifiers
H03F 3/64 Hierarchieinformationen		. . with tubes only
H03F 3/66 Hierarchieinformationen		. Amplifiers simultaneously generating oscillations of one frequency and amplifying signals of another frequency
H03F 3/68 Hierarchieinformationen		. Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics
H03F 3/70 Hierarchieinformationen		. Charge amplifiers [2]
H03F 3/72 Hierarchieinformationen		. Gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal [2]
H03F 5/00 Hierarchieinformationen		Amplifiers with both discharge tubes and semiconductor devices as amplifying elements
H03F 7/00 Hierarchieinformationen		Parametric amplifiers (devices or arrangements for the parametric generation or amplification of light, infra-red or ultra-violet waves G02F 1/39)
H03F 9/00 Hierarchieinformationen		Magnetic amplifiers
H03F 11/00 Hierarchieinformationen		Dielectric amplifiers
H03F 13/00 Hierarchieinformationen		Amplifiers using amplifying element consisting of two mechanically- or acoustically-coupled transducers, e.g. telephone-microphone amplifier
H03F 15/00 Hierarchieinformationen		Amplifiers using galvano-magnetic effects not involving mechanical movement, e.g. using Hall effect
H03F 17/00 Hierarchieinformationen		Amplifiers using electroluminescent element or photocell
H03F 19/00 Hierarchieinformationen		Amplifiers using superconductivity effects
H03F 99/00 Hierarchieinformationen		Subject matter not provided for in other groups of this subclass [2009.01]
H03G Hierarchieinformationen		CONTROL OF AMPLIFICATION (impedance networks, e.g. attenuators, H03H; control of transmission in lines H04B 3/04)
H03H Hierarchieinformationen		IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (measuring, testing G01R; arrangements for producing a reverberation or echo sound G10K 15/08; impedance networks or resonators consisting of distributed impedances, e.g. of the waveguide type, H01P; control of amplification, e.g. bandwidth control of amplifiers, H03G; tuning resonant circuits, e.g. tuning coupled resonant circuits, H03J; networks for modifying the frequency characteristics of communication systems H04B)
H03J Hierarchieinformationen		TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS (indicating arrangements for measuring G01D; measuring, testing G01R; remote-control in general G05, G08; automatic control or stabilisation of generators H03L)
H03K Hierarchieinformationen		PULSE TECHNIQUE (measuring pulse characteristics G01R; mechanical counters having an electrical input G06M; information storage devices in general G11; sample-and-hold arrangements in electric analogue stores G11C 27/02; construction of switches involving contact making and breaking for generation of pulses, e.g. by using a moving magnet, H01H; static conversion of electric power H02M; generation of oscillations by circuits employing active elements which operate in a non-switching manner H03B; modulating sinusoidal oscillations with pulses H03C, H04L; discriminator circuits involving pulse counting H03D; automatic control of generators H03L; starting, synchronisation, or stabilisation of generators where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M) [4]
H03L Hierarchieinformationen		AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES (of dynamo-electric generators H02P) [3]
H03M Hierarchieinformationen		CODING, DECODING OR CODE CONVERSION, IN GENERAL (using fluidic means F15C 4/00; optical analogue/digital converters G02F 7/00; coding, decoding or code conversion, specially adapted for particular applications, see the relevant subclasses, e.g. G01D, G01R, G06F, G06T, G09G, G10L, G11B, G11C, H04B, H04L, H04M, H04N; ciphering or deciphering for cryptography or other purposes involving the need for secrecy G09C) [4]
H04 Hierarchieinformationen		ELECTRIC COMMUNICATION TECHNIQUE
H05 Hierarchieinformationen		ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
H99 Hierarchieinformationen		SUBJECT MATTER NOT OTHERWISE PROVIDED FOR IN THIS SECTION [2006.01]

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