(0)H03F:0/1:
IPC6
SECTION H - ELECTRICITY
AMPLIFIERS
H03F
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H 03 F

 AMPLIFIERS (measuring, testing G 01 R; optical parametric amplifiers G 02 F; circuit arrangements with secondary emission tubes H 01 J 43/30; masers, lasers H 01 S; control of amplification H 03 G; coupling arrangements independent of the nature of the amplifier, voltage dividers H 03 H; amplifiers capable only of dealing with pulses H 03 K; repeater circuits in transmission lines H 04 B 3/36, H 04 B 3/58; application of speech amplifiers in telephonic communication H 04 M 1/60, H 04 M 3/40)
 

Note
 

This subclass covers:
 

-

 linear amplification, there being linear relationship between the amplitudes of input and output, and the output having substantially the same waveform as the input;
 

-

 dielectric amplifiers, magnetic amplifiers, and parametric amplifiers when used as oscillators or frequency-changers;
 

-

 constructions of active elements of dielectric amplifiers and parametric amplifiers if no provision exists elsewhere.

 

 

 
 

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/ 00 Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements

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/ 02 • Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation  

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/ 04 • • in discharge-tube amplifiers  

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/ 06 • • • to raise the efficiency of amplifying modulated radio frequency waves; to raise the efficiency of amplifiers acting also as modulators [2]  

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/ 07 • • • • Doherty-type amplifiers [2]  

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/ 08 • Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements (wide-band amplifiers with inter-stage coupling networks incorporating these impedances H 03 F 1/42; eliminating transit-time effects in vacuum tubes H 01 J 21/34)  

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/ 10 • • by use of amplifying elements with multiple electrode connections  

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/ 12 • • by use of attenuating means  

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/ 13 • • • in discharge-tube amplifiers [2]  

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/ 14 • • by use of neutralising means  

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/ 16 • • • in discharge-tube amplifiers  

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/ 18 • • by use of distributed coupling  

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/ 20 • • • in discharge-tube amplifiers  

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/ 22 • • by use of cascode coupling, i.e. earthed cathode or emitter stage followed by earthed grid or base stage respectively  

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/ 24 • • • in discharge-tube amplifiers  

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/ 26 • Modifications of amplifiers to reduce influence of noise generated by amplifying elements  

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/ 28 • • in discharge-tube amplifiers  

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/ 30 • Modifications of amplifiers to reduce influence of variations of temperature or supply voltage  

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/ 32 • Modifications of amplifiers to reduce non-linear distortion (by negative feedback H 03 F 1/34)  

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/ 33 • • in discharge-tube amplifiers [2]  

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/ 34 • Negative-feedback-circuit arrangements with or without positive feedback (H 03 F 1/02 to H 03 F 1/30, H 03 F 1/38 to H 03 F 1/50, H 03 F 3/50 take precedence) [3]  

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/ 36 • • in discharge-tube amplifiers  

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/ 38 • Positive-feedback circuit arrangements without negative feedback  

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/ 40 • • in discharge-tube amplifiers  

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/ 42 • Modifications of amplifiers to extend the bandwidth  

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/ 44 • • of tuned amplifiers  

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/ 46 • • • with tubes only  

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/ 48 • • of aperiodic amplifiers  

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/ 50 • • • with tubes only  

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/ 52 • Circuit arrangements for protecting such amplifiers [3]  

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/ 54 • • with tubes only [3]  

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/ 56 • Modifications of input or output impedances, not otherwise provided for [3]  
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