Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements

Introduced: September 1968

Last revised: January 2006

Classification Context

Section:: ELECTRICITY
Class:: ELECTRONIC CIRCUITRY
Subclass:: AMPLIFIERS

21 direct subcodes

Child Classifications

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H03F 3/02 with tubes only
H03F 3/04 with semiconductor devices only
H03F 3/18 with semiconductor devices of complementary types
H03F 3/181 Low-frequency amplifiers, e.g. audio preamplifiers
H03F 3/189 High-frequency amplifiers, e.g. radio frequency amplifiers
H03F 3/2 Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
H03F 3/26 Push-pull amplifiers; Phase-splitters therefor
H03F 3/3 Single-ended push-pull amplifiers; Phase-splitters therefor
H03F 3/34 DC amplifiers in which all stages are DC-coupled
H03F 3/38 DC amplifiers with modulator at input and demodulator at output; Modulators or demodulators specially adapted for use in such amplifiers
H03F 3/42 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 3/45 Differential amplifiers
H03F 3/46 Reflex amplifiers
H03F 3/5 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 3/54 Amplifiers using transit-time effect in tubes or semiconductor devices
H03F 3/6 Amplifiers in which coupling networks have distributed constants, e.g. with waveguide resonators
H03F 3/62 Two-way amplifiers
H03F 3/66 Amplifiers simultaneously generating oscillations of one frequency and amplifying signals of another frequency
H03F 3/68 Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics
H03F 3/7 Charge amplifiers