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

Child Classifications

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• H03F 3/005 CPC only CPC only
• H03F 3/02 with tubes only IPC+CPC Available in IPC and CPC
• H03F 3/04 with semiconductor devices only IPC+CPC Available in IPC and CPC
• H03F 3/18 with semiconductor devices of complementary types IPC only IPC only
• H03F 3/181 Low-frequency amplifiers, e.g. audio preamplifiers since 1974 IPC+CPC Available in IPC and CPC
• H03F 3/189 High-frequency amplifiers, e.g. radio frequency amplifiers since 1974 IPC+CPC Available in IPC and CPC
• H03F 3/20 Power amplifiers, e.g. Class B amplifiers, Class C amplifiers (H03F3/26 - H03F3/30 take precedence) IPC+CPC Available in IPC and CPC
• H03F 3/26 Push-pull amplifiers; Phase-splitters therefor (duplicated single-ended push-pull arrangements or phase-splitters therefor H03F3/30) +1 CPC IPC+CPC Available in IPC and CPC
• H03F 3/30 Single-ended push-pull amplifiers ; Phase-splitters therefor +5 CPC −1 IPC IPC+CPC Available in IPC and CPC
• H03F 3/34 DC amplifiers in which all stages are DC-coupled (H03F3/45 takes precedence) IPC+CPC Available in IPC and CPC
• H03F 3/38 DC amplifiers with modulator at input and demodulator at output; Modulators or demodulators specially adapted for use in such amplifiers IPC+CPC Available in IPC and CPC
• 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 +2 CPC IPC+CPC Available in IPC and CPC
• H03F 3/45 Differential amplifiers (differential sense amplifiers G11C7/062) since 1974 +1 CPC IPC+CPC Available in IPC and CPC
• H03F 3/46 Reflex amplifiers IPC+CPC Available in IPC and CPC
• H03F 3/50 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 +1 CPC IPC+CPC Available in IPC and CPC
• H03F 3/54 Amplifiers using transit-time effect in tubes or semiconductor devices (parametric amplifiers H03F7/00; solid state travelling-wave devices H10N70/10) IPC+CPC Available in IPC and CPC
• H03F 3/60 Amplifiers in which coupling networks have distributed constants, e.g. with waveguide resonators (H03F3/54 takes precedence) +4 CPC IPC+CPC Available in IPC and CPC
• H03F 3/62 Two-way amplifiers IPC+CPC Available in IPC and CPC
• H03F 3/66 Amplifiers simultaneously generating oscillations of one frequency and amplifying signals of another frequency IPC+CPC Available in IPC and CPC
• H03F 3/68 Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics IPC+CPC Available in IPC and CPC
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