H03F   1/00		ǻҤȤŻҴɤΤߡȾƳ֤ΤߤޤǻҤΤߤѤκ	Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements	5084
H03F   1/02		ǽΨ夲뤿ѷ㡥ʤѤΡưѤ	Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation	12929
H03F   1/04		ŻҴˤ	in discharge-tube amplifiers	214
H03F   1/06		Ĵ줿̵ȤǽΨ夲뤿ΤΡĴȤƤưǽΨ夲뤿ΤΡΣ	to raise the efficiency of amplifying modulated radio frequency waves; to raise the efficiency of amplifiers acting also as modulators	569
H03F   1/07		ɥϥƥΣ	Doherty-type amplifiers	909
H03F   1/08		ǻҤԡ󥹤ͭʱƶ㸺뤿ѷʤΥԡ󥹤Ȥ߹ʷϩ֤ĹӰȣƣˡΣ	Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements(wide-band amplifiers with inter-stage coupling networks incorporating these impedances <b>H03F1/42</b>)	2213
H03F   1/10		¿Ŷ³ǻҤλѤˤ	by use of amplifying elements with multiple electrode connections	67
H03F   1/12		ʤλѤˤ	by use of attenuating means	210
H03F   1/13		ŻҴˤΡΣ	in discharge-tube amplifiers	99
H03F   1/14		¼ʤλѤˤ	by use of neutralising means	810
H03F   1/16		ŻҴˤ	in discharge-tube amplifiers	479
H03F   1/18		ʬ۷λѤˤ	by use of distributed coupling	153
H03F   1/20		ŻҴˤ	in discharge-tube amplifiers	112
H03F   1/22		ɷ硤ʤɤޤϥߥåʤμˤ줾쥰åɤޤϥ١ʤ³ΡλѤˤ	by use of cascode coupling, i.e. earthed cathode or emitter stage followed by earthed grid or base stage respectively	2090
H03F   1/24		ŻҴˤ	in discharge-tube amplifiers	49
H03F   1/26		ǻҤˤäȯ뻨αƶ㸺뤿ѷ	Modifications of amplifiers to reduce influence of noise generated by amplifying elements	7641
H03F   1/28		ŻҴˤ	in discharge-tube amplifiers	146
H03F   1/30		Ѳޤ϶ŰѲαƶ㸺뤿ѷ	Modifications of amplifiers to reduce influence of variations of temperature or supply voltage	11099
H03F   1/32		ľҤߤ㸺뤿ѷ鵢ԤˤΣȣƣ	Modifications of amplifiers to reduce non-linear distortion(by negative feedback <b>H03F1/34</b>)	13074
H03F   1/33		ŻҴˤΡΣ	in discharge-tube amplifiers	192
H03F   1/34		ԤġޤϤ⤿ʤ鵢Բϩ֡ʣȣƣȣƣȣƣȣƣȣƣͥˡΣ	Negative-feedback-circuit arrangements with or without positive feedback(<b>H03F1/02 to H03F1/30</b> , <b>H03F1/38 to H03F1/50</b> , <b>H03F3/50</b> take precedence)	5752
H03F   1/36		ŻҴˤ	in discharge-tube amplifiers	1208
H03F   1/38		鵢Ԥ⤿ʤԲϩ	Positive-feedback circuit arrangements without negative feedback	350
H03F   1/40		ŻҴˤ	in discharge-tube amplifiers	67
H03F   1/42		ӰȤ뤿ѷ	Modifications of amplifiers to extend the bandwidth	4984
H03F   1/44		ƱĴ	of tuned amplifiers	198
H03F   1/46		ŻҴɤΤߤĤ	with tubes only	14
H03F   1/48		ƱĴ	of aperiodic amplifiers	827
H03F   1/50		ŻҴɤΤߤĤ	with tubes only	560
H03F   1/52		ݸ뤿βϩ֡Σ	Circuit arrangements for protecting such amplifiers	7130
H03F   1/54		ŻҴɤΤߤĤΡΣ	with tubes only	1072
H03F   1/56		¾ʬवʤϥԡ󥹤ޤϽϥԡ󥹤ѷΣ	Modifications of input or output impedances, not otherwise provided for	6570
H03F   3/00		ǻҤȤŻҴɤΤߤޤȾƳ֤Τߤ<br><br><b><ul></ul></b><br>롼ףϥ롼ףͥ褹롣Σ	Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements	1708
H03F   3/02		ŻҴɤΤߤĤΡΣ	with tubes only	669
H03F   3/04		ȾƳ֤ΤߤĤΡΣ	with semiconductor devices only	2705
H03F   3/06		ۡѸ̤Ѥ	using hole storage effect	25
H03F   3/08		ˤä椵줿	controlled by light	3586
H03F   3/10		ɤĤ	with diodes	327
H03F   3/12		ɤĤ	with Esaki diodes	178
H03F   3/14		İʾŶˤޤϣİʾΣУܹ֤ͭĤ	with amplifying devices having more than three electrodes or more than two PN junctions	263
H03F   3/16		ų֤Ĥ	with field-effect devices	1673
H03F   3/18		䷿ȾƳ֤ĤΡΣ	with semiconductor devices of complementary types	571
H03F   3/181		㡥İΣ	Low-frequency amplifiers, e.g. audio preamplifiers	2573
H03F   3/183		ȾƳ֤ΤߤĤΡΣ	with semiconductor devices only	1528
H03F   3/185		ų֤ĤΡʣȣƣͥˡΣ	with field-effect devices(<b>H03F3/187</b> takes precedence)	601
H03F   3/187		ѲϩˤΡΣ	in integrated circuits	940
H03F   3/189		㡥̵Σ	High-frequency amplifiers, e.g. radio frequency amplifiers	3971
H03F   3/19		ȾƳ֤ΤߤĤΡΣ	with semiconductor devices only	4726
H03F   3/191		ƱĴʣȣƣȣƣͥˡΣ	Tuned amplifiers(<b>H03F3/193</b>, <b>H03F3/195</b> take precedence)	1422
H03F   3/193		ų֤ĤΡʣȣƣͥˡΣ	with field-effect devices(<b>H03F3/195</b> takes precedence)	3707
H03F   3/195		ѲϩˤΡΣ	in integrated circuits	4005
H03F   3/20		㡥µõʣȣƣȣƣͥ	Power amplifiers, e.g. Class B amplifiers, Class C amplifiers(<b>H03F3/26 to H03F3/30</b>  take precedence)	9696
H03F   3/21		ȾƳ֤ΤߤĤΡΣ	with semiconductor devices only	7082
H03F   3/213		ѲϩˤΡΣ	in integrated circuits	2576
H03F   3/217		ĵåΣ	Class D power amplifiers; Switching amplifiers	6163
H03F   3/22		ŻҴɤΤߤĤΡʣȣƣͥ	with tubes only(<b>H03F3/24</b> takes precedence)	359
H03F   3/24		ʤ	of transmitter output stages	7917
H03F   3/26		ץåץΤΰʬФˤʤä󥰥륨ǥåȥץåץ֤ޤϤΤΰʬȣƣ	Push-pull amplifiers; Phase-splitters therefor(duplicated single-ended push-pull arrangements or phase-splitters therefor <b>H03F3/30</b>)	2395
H03F   3/28		ɤΤߤĤ	with tubes only	640
H03F   3/30		󥰥륨ǥåȥץåץΤΰʬ	Single-ended push-pull amplifiers; Phase-splitters therefor	4747
H03F   3/32		ŻҴɤΤߤĤ	with tubes only	583
H03F   3/34		ʤľή礵줿ľήʣȣƣͥˡΣ	DC amplifiers in which all stages are DC-coupled(<b>H03F3/45</b> takes precedence)	5472
H03F   3/343		ȾƳ֤ΤߤĤΡΣ	with semiconductor devices only	3486
H03F   3/345		ų֤ĤΡʣȣƣͥˡΣ	with field-effect devices(<b>H03F3/347</b> takes precedence)	1535
H03F   3/347		ѲϩˤΡΣ	in integrated circuits	1727
H03F   3/36		ŻҴɤΤߤĤ	with tubes only	436
H03F   3/38		¦Ĵ¦ĴľήѤ뤿äŬ礷ĴޤĴΣ	DC amplifiers with modulator at input and demodulator at output; Modulators or demodulators specially adapted for use in such amplifiers	1557
H03F   3/387		ȾƳ֤ΤߤĤΡΣ	with semiconductor devices only	541
H03F   3/393		ų֤ĤΡΣ	with field-effect devices	268
H03F   3/40		ŻҴɤΤߤĤ	with tubes only	343
H03F   3/42		İʾǻҤ٤ľľήϩʤĳǻҤŶˤȤϿΰ忶㡥ȡƥݡ	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	492
H03F   3/44		ŻҴɤΤߤĤ	with tubes only	151
H03F   3/45		ưΣ	Differential amplifiers	22653
H03F   3/46		ȿ	Reflex amplifiers	92
H03F   3/48		ŻҴɤΤߤĤ	with tubes only	249
H03F   3/50		ǻҤϲϩ˶̤ʥԡ󥹤ϤäޤϤ줫ϤФ㡥ɥۥ	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	1357
H03F   3/52		ŻҴɤΤߤĤ	with tubes only	304
H03F   3/54		ŻҴɤޤȾƳ֤Իָ̤Ѥʥѥȥåȣƣοʹ֣ȣΣˡΣ	Amplifiers using transit-time effect in tubes or semiconductor devices(parametric amplifiers <b>H03F7/00</b>; solid state travelling-wave devices <b>H10N70/10</b>)	590
H03F   3/55		ȾƳ֤ΤߤĤΡΣ	with semiconductor devices only	127
H03F   3/56		饤ȥѤ	using klystrons	87
H03F   3/58		ʹȴɤѤ	using travelling-wave tubes	274
H03F   3/60		ϩ֤ʬ㡥ƳȴɶĤΡʣȣƣͥ	Amplifiers in which coupling networks have distributed constants, e.g. with waveguide resonators(<b>H03F3/54</b> takes precedence)	5481
H03F   3/62			Two-way amplifiers	435
H03F   3/64		ŻҴɤΤߤĤ	with tubes only	56
H03F   3/66		ȿοưȯƱ¾μȿο	Amplifiers simultaneously generating oscillations of one frequency and amplifying signals of another frequency	167
H03F   3/68		Ȥ߹碌㡥Ωβ¿ͥ	Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics	8631
H03F   3/70		ŲΣ	Charge amplifiers	812
H03F   3/72		ʤ濮ˤäưޤưˤʤΣ	Gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal	2419
H03F   5/00		ǻҤȤŻҴɤȾƳ֤򶦤ˤ	Amplifiers with both discharge tubes and semiconductor devices as amplifying elements	236
H03F   7/00		ѥȥåΣ	Parametric amplifiers	430
H03F   7/02		ѥǻҤѤΡƩΨǻҤѤ	using variable-inductance element; using variable-permeability element	123
H03F   7/04		ѥѥǻҤѤΡͶΨǻҤѤ	using variable-capacitance element; using variable-permitivity element	459
H03F   7/06		ŻҥӡɤĤ	with electron beam tube	12
H03F   9/00			Magnetic amplifiers	533
H03F   9/02		ή淿ʤή祳̤äξήΡΣ	current-controlled, i.e. the load current flowing in both directions through a main coil	351
H03F   9/04		Ű淿ʤή祳̤äưΤߤήΡ㡥ϩʣȣƣͥˡΣ	voltage-controlled, i.e. the load current flowing in only one direction through a main coil, e.g. Logan circuits(<b>H03F9/06</b> takes precedence)	385
H03F   9/06		Űʬ淿ʤή祳̤äưΤߤή졤Τ祳봬洬ȤƤѤ뤳ȤǤΡ㡥졼ߡϩΣ	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	107
H03F  11/00		Ͷ	Dielectric amplifiers	89
H03F  13/00		ŪޤϲŪ˷礵줿ĤѴ狼ʤǻҤѤ㡥õݥޥۥ	Amplifiers using amplifying element consisting of two mechanically- or acoustically-coupled transducers, e.g. telephone-microphone amplifier	301
H03F  15/00		Ūưޤޤʤή̤Ѥ㡥̤ۡѤ	Amplifiers using galvano-magnetic effects not involving mechanical movement, e.g. using Hall effect	125
H03F  17/00		ŵߥͥåǻҤޤϸϤѤ	Amplifiers using electroluminescent element or photocell	241
H03F  19/00		ĶƳ̤Ѥ	Amplifiers using superconductivity effects	244
H03F  99/00		Υ֥饹¾Υ롼פˤʬवʤࡡΣ	Subject matter not provided for in other groups of this subclass	814
