IPC-Stelle: H03F 3/44 [Version 2006.01]

SymbolTypTitel
HSKSECTION H — ELECTRICITY
H03KLBASIC ELECTRONIC CIRCUITRY
H03FUKLAMPLIFIERS (measuring, testing G01R; optical parametric amplifiers G02F; circuit arrangements with secondary emission tubes H01J 43/30; masers, lasers H01S; 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 1/00HGRDetails of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
H03F 1/02UGR1
.Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
H03F 1/04UGR2
. .in discharge-tube amplifiers
H03F 1/06UGR3
. . .to raise the efficiency of amplifying modulated radio frequency waves; to raise the efficiency of amplifiers acting also as modulators [2]
H03F 1/07UGR4
. . . .Doherty-type amplifiers [2]
H03F 1/08UGR1
.Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements (wide-band amplifiers with inter-stage coupling networks incorporating these impedances H03F 1/42; eliminating transit-time effects in vacuum tubes H01J 21/34)
H03F 1/10UGR2
. .by use of amplifying elements with multiple electrode connections
H03F 1/12UGR2
. .by use of attenuating means
H03F 1/13UGR3
. . .in discharge-tube amplifiers [2]
H03F 1/14UGR2
. .by use of neutralising means
H03F 1/16UGR3
. . .in discharge-tube amplifiers
H03F 1/18UGR2
. .by use of distributed coupling
H03F 1/20UGR3
. . .in discharge-tube amplifiers
H03F 1/22UGR2
. .by use of cascode coupling, i.e. earthed cathode or emitter stage followed by earthed grid or base stage respectively
H03F 1/24UGR3
. . .in discharge-tube amplifiers
H03F 1/26UGR1
.Modifications of amplifiers to reduce influence of noise generated by amplifying elements
H03F 1/28UGR2
. .in discharge-tube amplifiers
H03F 1/30UGR1
.Modifications of amplifiers to reduce influence of variations of temperature or supply voltage
H03F 1/32UGR1
.Modifications of amplifiers to reduce non-linear distortion (by negative feedback H03F 1/34)
H03F 1/33UGR2
. .in discharge-tube amplifiers [2]
H03F 1/34UGR1
.Negative-feedback-circuit arrangements with or without positive feedback (H03F 1/02-H03F 1/30, H03F 1/38-H03F 1/50, H03F 3/50 take precedence) [3]
H03F 1/36UGR2
. .in discharge-tube amplifiers
H03F 1/38UGR1
.Positive-feedback circuit arrangements without negative feedback
H03F 1/40UGR2
. .in discharge-tube amplifiers
H03F 1/42UGR1
.Modifications of amplifiers to extend the bandwidth
H03F 1/44UGR2
. .of tuned amplifiers
H03F 1/46UGR3
. . .with tubes only
H03F 1/48UGR2
. .of aperiodic amplifiers
H03F 1/50UGR3
. . .with tubes only
H03F 1/52UGR1
.Circuit arrangements for protecting such amplifiers [3]
H03F 1/54UGR2
. .with tubes only [3]
H03F 1/56UGR1
.Modifications of input or output impedances, not otherwise provided for [3]
H03F 3/00HGRAmplifiers with only discharge tubes or only semiconductor devices as amplifying elements
H03F 3/02UGR1
.with tubes only (subsequent subgroups take precedence)
H03F 3/04UGR1
.with semiconductor devices only (subsequent subgroups take precedence)
H03F 3/06UGR2
. .using hole storage effect
H03F 3/08UGR2
. .controlled by light
H03F 3/10UGR2
. .with diodes
H03F 3/12UGR3
. . .with Esaki diodes
H03F 3/14UGR2
. .with amplifying devices having more than three electrodes or more than two PN junctions
H03F 3/16UGR2
. .with field-effect devices
H03F 3/18UGR1
.with semiconductor devices of complementary types (subsequent subgroups take precedence)
H03F 3/181UGR1
.Low-frequency amplifiers, e.g. audio preamplifiers [2]
H03F 3/183UGR2
. .with semiconductor devices only [2]
H03F 3/185UGR3
. . .with field-effect devices (H03F 3/187 takes precedence) [2]
H03F 3/187UGR3
. . .in integrated circuits [2]
H03F 3/189UGR1
.High-frequency amplifiers, e.g. radio frequency amplifiers [2]
H03F 3/19UGR2
. .with semiconductor devices only [2]
H03F 3/191UGR3
. . .Tuned amplifiers (H03F 3/193, H03F 3/195 take precedence) [2]
H03F 3/193UGR3
. . .with field-effect devices (H03F 3/195 takes precedence) [2]
H03F 3/195UGR3
. . .in integrated circuits [2]
H03F 3/20UGR1
.Power amplifiers, e.g. Class B amplifiers, Class C amplifiers (H03F 3/26-H03F 3/30 take precedence)
H03F 3/21UGR2
. .with semiconductor devices only [2]
H03F 3/213UGR3
. . .in integrated circuits [2]
H03F 3/217UGR3
. . .Class D power amplifiers; Switching amplifiers [2]
H03F 3/22UGR2
. .with tubes only (H03F 3/24 takes precedence)
H03F 3/24UGR2
. .of transmitter output stages
H03F 3/26UGR1
.Push-pull amplifiers; Phase-splitters therefor (duplicated single-ended push-pull arrangements or phase-splitters therefor H03F 3/30)
H03F 3/28UGR2
. .with tubes only
H03F 3/30UGR1
.Single-ended push-pull amplifiers; Phase-splitters therefor
H03F 3/32UGR2
. .with tubes only
H03F 3/34UGR1
.Dc amplifiers in which all stages are dc-coupled (H03F 3/45 takes precedence) [3]
H03F 3/343UGR2
. .with semiconductor devices only [2]
H03F 3/345UGR3
. . .with field-effect devices (H03F 3/347 takes precedence) [2]
H03F 3/347UGR3
. . .in integrated circuits [2]
H03F 3/36UGR2
. .with tubes only
H03F 3/38UGR1
.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 3/387UGR2
. .with semiconductor devices only [2]
H03F 3/393UGR3
. . .with field-effect devices [2]
H03F 3/40UGR2
. .with tubes only
H03F 3/42UGR1
.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 3/44UGR2
. .with tubes only
H03F 3/45UGR1
.Differential amplifiers [2]
H03F 3/46UGR1
.Reflex amplifiers
H03F 3/48UGR2
. .with tubes only
H03F 3/50UGR1
.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 3/52UGR2
. .with tubes only
H03F 3/54UGR1
.Amplifiers using transit-time effect in tubes or semiconductor devices (parametric amplifiers H03F 7/00; solid state travelling-wave devices H01L 45/02)
H03F 3/55UGR2
. .with semiconductor devices only [2]
H03F 3/56UGR2
. .using klystrons
H03F 3/58UGR2
. .using travelling-wave tubes
H03F 3/60UGR1
.Amplifiers in which coupling networks have distributed constants, e.g. with waveguide resonators (H03F 3/54 takes precedence)
H03F 3/62UGR1
.Two-way amplifiers
H03F 3/64UGR2
. .with tubes only
H03F 3/66UGR1
.Amplifiers simultaneously generating oscillations of one frequency and amplifying signals of another frequency
H03F 3/68UGR1
.Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics
H03F 3/70UGR1
.Charge amplifiers [2]
H03F 3/72UGR1
.Gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal [2]
H03F 5/00HGRAmplifiers with both discharge tubes and semiconductor devices as amplifying elements
H03F 7/00HGRParametric amplifiers (devices or arrangements for the parametric generation or amplification of light, infra-red or ultra-violet waves G02F 1/39)
H03F 7/02UGR1
.using variable-inductance element; using variable-permeability element
H03F 7/04UGR1
.using variable-capacitance element; using variable-permitivity element
H03F 7/06UGR1
.with electron beam tube
H03F 9/00HGRMagnetic amplifiers
H03F 9/02UGR1
.current-controlled, i.e. the load current flowing in both directions through a main coil [2]
H03F 9/04UGR1
.voltage-controlled, i.e. the load current flowing in only one direction through a main coil, e.g. Logan circuits (H03F 9/06 takes precedence) [2]
H03F 9/06UGR1
.Control by voltage time integral, i.e. the load current flowing in only one direction through a main coil, whereby the main coil winding also can be used as a control winding, e.g. Ramey circuits [2]
H03F 11/00HGRDielectric amplifiers
H03F 13/00HGRAmplifiers using amplifying element consisting of two mechanically- or acoustically-coupled transducers, e.g. telephone-microphone amplifier
H03F 15/00HGRAmplifiers using galvano-magnetic effects not involving mechanical movement, e.g. using Hall effect
H03F 17/00HGRAmplifiers using electroluminescent element or photocell
H03F 19/00HGRAmplifiers using superconductivity effects
H03F 21/00HGRAmplifiers not covered by groups H03F 3/00-H03F 19/00 (dynamo-electric amplifiers H02K)