H03F   1/00  \	0	0	5J500	H03F   1/00	560	ǻҤȤŻҴɤΤߡȾƳ֤ΤߤޤǻҤΤߤѤκ	Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
H03F   1/00 210 \	1	1	5J500	H03F   1/00	527	Ÿ󡦥ջλ	Eliminating noise upon switching on or off power supply
H03F   1/00 220 \	2	2	5J500	H03F   1/00	938	¦ϩ	Shunting or shutting off of signals
H03F   1/00 230 \	2	2	5J500	H03F   1/00	440	ϿΩꡤΩ	Rising or falling control of output signals
H03F   1/00 240 \	2	2	5J500	H03F   1/00	341	ϩΰưưޤŸŰäΥߥ	Operating or non-operating a portion of circuit or timing controlling for applying power supply voltages
H03F   1/02  \	1	1	5J500	H03F   1/02	3117	ǽΨ夲뤿ѷ㡥ʤѤΡưѤ	Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
H03F   1/02 111 \	2	2	5J500	H03F   1/02	1024	Űޤή򤹤	with control of the supply voltage or current
H03F   1/02 144 \	3	3	5J500	H03F   1/02	185	ƥå	Stepped control
H03F   1/02 161 \	2	2	5J500	H03F   1/02	328	Ĵ줿Űޤή򤹤	with control of the polarisation voltage or current
H03F   1/02 188 \	2	2	5J500	H03F   1/02	694	ɥϥƥŻҴˤΣȣƣ	Doherty-type amplifiers (in discharge-tube amplifiers H03F 1/07)
H03F   1/02 194 \	2	2	5J500	H03F   1/02	174	İʾΰ꿶ΰĴΥ٥ȥûѤ	using vector summing of two or more constant amplitude phase-modulated signals
H03F   1/04  \	2	2	5J500	H03F   1/04	8	ŻҴˤ	in discharge-tube amplifiers
H03F   1/06  \	3	3	5J500	H03F   1/06	330	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 [2]
H03F   1/07  \	4	4	5J500	H03F   1/07	436	ɥϥƥΣ	Doherty-type amplifiers [2]
H03F   1/08  \	1	1	5J500	H03F   1/08	405	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 H03F 1/42) [2006.01]
H03F   1/10  \	2	2	5J500	H03F   1/10	4	¿Ŷ³ǻҤλѤˤ	by use of amplifying elements with multiple electrode connections
H03F   1/12  \	2	2	5J500	H03F   1/12	18	ʤλѤˤ	by use of attenuating means
H03F   1/13  \	3	3	5J500	H03F   1/13	1	ŻҴˤΡΣ	in discharge-tube amplifiers [2]
H03F   1/14  \	2	2	5J500	H03F   1/14	195	¼ʤλѤˤ	by use of neutralising means
H03F   1/16  \	3	3	5J500	H03F   1/16	1	ŻҴˤ	in discharge-tube amplifiers
H03F   1/18  \	2	2	5J500	H03F   1/18	44	ʬ۷λѤˤ	by use of distributed coupling
H03F   1/20  \	3	3	5J500	H03F   1/20	1	ŻҴˤ	in discharge-tube amplifiers
H03F   1/22  \	2	2	5J500	H03F   1/22	727	ɷ硤ʤɤޤϥߥåʤμˤ줾쥰åɤޤϥ١ʤ³ΡλѤˤ	by use of cascode coupling, i.e. earthed cathode or emitter stage followed by earthed grid or base stage respectively
H03F   1/24  \	3	3	5J500	H03F   1/24	3	ŻҴˤ	in discharge-tube amplifiers
H03F   1/26  \	1	1	5J500	H03F   1/26	1684	ǻҤˤäȯ뻨αƶ㸺뤿ѷ	Modifications of amplifiers to reduce influence of noise generated by amplifying elements
H03F   1/28  \	2	2	5J500	H03F   1/28	8	ŻҴˤ	in discharge-tube amplifiers
H03F   1/30  \	1	1	5J500	H03F   1/30	409	Ѳޤ϶ŰѲαƶ㸺뤿ѷ	Modifications of amplifiers to reduce influence of variations of temperature or supply voltage
H03F   1/30 210 \	2	2	5J500	H03F   1/30	2575	Ѳαƶ㸺	Reducing influence due to changes in temperatures
H03F   1/30 220 \	2	2	5J500	H03F   1/30	1603	ŰѲαƶ㸺	Reducing influence due to changes in power supply voltages
H03F   1/32  \	1	1	5J500	H03F   1/32	4916	ľҤߤ㸺뤿ѷ鵢ԤˤΣȣƣ	Modifications of amplifiers to reduce non-linear distortion (by negative feedback H03F 1/34)
H03F   1/32 123 \	2	2	5J500	H03F   1/32	547	եɥեɤѤ	using feed-forward
H03F   1/32 141 \	2	2	5J500	H03F   1/32	1263	ץǥȡѤ	using predistortion circuits
H03F   1/32 158 \	3	3	5J500	H03F   1/32	96	¿༰˴Ť	based on polynomial terms
H03F   1/33  \	2	2	5J500	H03F   1/33	6	ŻҴˤΡΣ	in discharge-tube amplifiers [2]
H03F   1/34  \	1	1	5J500	H03F   1/34	3128	ԤġޤϤ⤿ʤ鵢Բϩ֡ʣȣƣȣƣȣƣȣƣȣƣͥˡΣ	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   1/36  \	2	2	5J500	H03F   1/36	6	ŻҴˤ	in discharge-tube amplifiers
H03F   1/38  \	1	1	5J500	H03F   1/38	74	鵢Ԥ⤿ʤԲϩ	Positive-feedback circuit arrangements without negative feedback
H03F   1/40  \	2	2	5J500	H03F   1/40	1	ŻҴˤ	in discharge-tube amplifiers
H03F   1/42  \	1	1	5J500	H03F   1/42	802	ӰȤ뤿ѷ	Modifications of amplifiers to extend the bandwidth
H03F   1/44  \	2	2	5J500	H03F   1/44	39	ƱĴ	of tuned amplifiers
H03F   1/46  \	3	3	5J500	H03F   1/46	0	ŻҴɤΤߤĤ	with tubes only
H03F   1/48  \	2	2	5J500	H03F   1/48	217	ƱĴ	of aperiodic amplifiers
H03F   1/50  \	3	3	5J500	H03F   1/50	2	ŻҴɤΤߤĤ	with tubes only
H03F   1/52  \	1	1	5J500	H03F   1/52	2423	ݸ뤿βϩ֡Σ	Circuit arrangements for protecting such amplifiers [3]
H03F   1/52 210 \	2	2	5J500	H03F   1/52	855	ץåץݸϩ	Circuit arrangements for protecting push-pull amplifiers
H03F   1/52 220 \	2	2	5J500	H03F   1/52	923	ų̥ȥ󥸥ݸϩ	Circuit arrangements for protecting field effect transistors
H03F   1/54  \	2	2	5J500	H03F   1/54	6	ŻҴɤΤߤĤΡΣ	with tubes only [3]
H03F   1/56  \	1	1	5J500	H03F   1/56	582	¾ʬवʤϥԡ󥹤ޤϽϥԡ󥹤ѷΣ	Modifications of input or output impedances, not otherwise provided for [3]
H03F   3/00  \	0	0	5J500	H03F   3/00	203	ǻҤȤŻҴɤΤߤޤȾƳ֤Τߤ	Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
H03F   3/02  \	1	1	5J500	H03F   3/02	125	ŻҴɤΤߤĤΡΣ	with tubes only [2006.01]
H03F   3/04  \	1	1	5J500	H03F   3/04	288	ȾƳ֤ΤߤĤΡΣ	with semiconductor devices only [2006.01]
H03F   3/06  \	2	2	5J500	H03F   3/06	21	ۡѸ̤Ѥ	using hole storage effect
H03F   3/08  \	2	2	5J500	H03F   3/08	1820	ˤä椵줿	controlled by light
H03F   3/10  \	2	2	5J500	H03F   3/10	130	ɤĤ	with diodes
H03F   3/12  \	3	3	5J500	H03F   3/12	74	ɤĤ	with Esaki diodes
H03F   3/14  \	2	2	5J500	H03F   3/14	20	İʾŶˤޤϣİʾΣУܹ֤ͭĤ	with amplifying devices having more than three electrodes or more than two PN junctions
H03F   3/16  \	2	2	5J500	H03F   3/16	135	ų֤Ĥ	with field-effect devices
H03F   3/16 210 \	3	3	5J500	H03F   3/16	82	ʡƣţԤĤ	with JFET
H03F   3/16 220 \	3	3	5J500	H03F   3/16	178	ͣϣӡƣţԤĤ	with MOSFET
H03F   3/18  \	1	1	5J500	H03F   3/18	97	䷿ȾƳ֤ĤΡΣ	with semiconductor devices of complementary types [2006.01]
H03F   3/181  \	1	1	5J500	H03F   3/181	597	㡥İΣ	Low-frequency amplifiers, e.g. audio preamplifiers [2]
H03F   3/181 210 \	2	2	5J500	H03F   3/181	652	ڴϩĤ	with switching circuits
H03F   3/181 220 \	2	2	5J500	H03F   3/181	399	ߥ󥰲ϩ	Mixing circuits
H03F   3/183  \	2	2	5J500	H03F   3/183	303	ȾƳ֤ΤߤĤΡΣ	with semiconductor devices only [2]
H03F   3/185  \	3	3	5J500	H03F   3/185	138	ų֤ĤΡʣȣƣͥˡΣ	with field-effect devices (H03F 3/187 takes precedence) [2]
H03F   3/187  \	3	3	5J500	H03F   3/187	148	ѲϩˤΡΣ	in integrated circuits [2]
H03F   3/189  \	1	1	5J500	H03F   3/189	1144	㡥̵Σ	High-frequency amplifiers, e.g. radio frequency amplifiers [2]
H03F   3/19  \	2	2	5J500	H03F   3/19	804	ȾƳ֤ΤߤĤΡΣ	with semiconductor devices only [2]
H03F   3/191  \	3	3	5J500	H03F   3/191	543	ƱĴʣȣƣȣƣͥˡΣ	Tuned amplifiers (H03F 3/193, H03F 3/195 take precedence) [2]
H03F   3/193  \	3	3	5J500	H03F   3/193	913	ų֤ĤΡʣȣƣͥˡΣ	with field-effect devices (H03F 3/195 takes precedence) [2]
H03F   3/195  \	3	3	5J500	H03F   3/195	578	ѲϩˤΡΣ	in integrated circuits [2]
H03F   3/20  \	1	1	5J500	H03F   3/20	1148	㡥µõʣȣƣȣƣͥ	Power amplifiers, e.g. Class B amplifiers, Class C amplifiers (H03F 3/26-H03F 3/30 take precedence)
H03F   3/21  \	2	2	5J500	H03F   3/21	1017	ȾƳ֤ΤߤĤΡΣ	with semiconductor devices only [2]
H03F   3/213  \	3	3	5J500	H03F   3/213	781	ѲϩˤΡΣ	in integrated circuits [2]
H03F   3/217  \	3	3	5J500	H03F   3/217	2184	ĵåΣ	Class D power amplifiers; Switching amplifiers [2]
H03F   3/217 130 \	4	4	5J500	H03F   3/217	1201	֥åΤ	of the bridge type
H03F   3/217 150 \	4	4	5J500	H03F   3/217	252	ʥǥѴޤϥǥ롿ʥѴѤΡʣȣƣͥ	using analogue-digital or digital-analogue conversion (H03F 3/217,130 takes precedence)
H03F   3/217 160 \	4	4	5J500	H03F   3/217	74	ŵ	Class E amplifiers
H03F   3/217 180 \	4	4	5J500	H03F   3/217	82	İʾΥåޤϥåޤľѤΡʣȣƣȣƣͥ	using more than one switch or switching amplifier in parallel or in series (H03F 3/217,130, H03F 3/217,150 take precedence)
H03F   3/22  \	2	2	5J500	H03F   3/22	84	ŻҴɤΤߤĤΡʣȣƣͥ	with tubes only (H03F 3/24 takes precedence)
H03F   3/24  \	2	2	5J500	H03F   3/24	3403	ʤ	of transmitter output stages
H03F   3/26  \	1	1	5J500	H03F   3/26	619	ץåץΤΰʬФˤʤä󥰥륨ǥåȥץåץ֤ޤϤΤΰʬȣƣ	Push-pull amplifiers; Phase-splitters therefor (duplicated single-ended push-pull arrangements or phase-splitters therefor H03F 3/30)
H03F   3/28  \	2	2	5J500	H03F   3/28	123	ɤΤߤĤ	with tubes only
H03F   3/30  \	1	1	5J500	H03F   3/30	2681	󥰥륨ǥåȥץåץΤΰʬ	Single-ended push-pull amplifiers; Phase-splitters therefor
H03F   3/32  \	2	2	5J500	H03F   3/32	19	ŻҴɤΤߤĤ	with tubes only
H03F   3/34  \	1	1	5J500	H03F   3/34	455	ʤľή礵줿ľήʣȣƣͥˡΣ	DC amplifiers in which all stages are dc-coupled  (H03F 3/45 takes precedence) [2006.01]
H03F   3/34 210 \	2	2	5J500	H03F   3/34	1609	եåȡɥեȽϩ	Circuits for eliminating offsets or drifts
H03F   3/34 220 \	2	2	5J500	H03F   3/34	412	եåȡɥեȤθХĤ	with cycles for detecting offsets or drifts
H03F   3/34 230 \	2	2	5J500	H03F   3/34	643	ŰήѴϩ	Voltage current converter circuits
H03F   3/343  \	2	2	5J500	H03F   3/343	1089	ȾƳ֤ΤߤĤΡΣ	with semiconductor devices only [2]
H03F   3/343 210 \	3	3	5J500	H03F   3/343	1821	ήߥ顼ϩ	Current mirror circuits
H03F   3/345  \	3	3	5J500	H03F   3/345	109	ų֤ĤΡʣȣƣͥˡΣ	with field-effect devices (H03F 3/347 takes precedence) [2]
H03F   3/345 210 \	4	4	5J500	H03F   3/345	224	ʡƣţԤĤ	with JFET
H03F   3/345 220 \	4	4	5J500	H03F   3/345	780	ͣϣӡƣţԤĤ	with MOSFET
H03F   3/347  \	3	3	5J500	H03F   3/347	1447	ѲϩˤΡΣ	in integrated circuits [2]
H03F   3/36  \	2	2	5J500	H03F   3/36	5	ŻҴɤΤߤĤ	with tubes only
H03F   3/38  \	1	1	5J500	H03F   3/38	583	¦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 [2006.01]
H03F   3/38 210 \	2	2	5J500	H03F   3/38	397	ͭ	with insulation
H03F   3/387  \	2	2	5J500	H03F   3/387	63	ȾƳ֤ΤߤĤΡΣ	with semiconductor devices only [2]
H03F   3/393  \	3	3	5J500	H03F   3/393	67	ų֤ĤΡΣ	with field-effect devices [2]
H03F   3/40  \	2	2	5J500	H03F   3/40	3	ŻҴɤΤߤĤ	with tubes only
H03F   3/42  \	1	1	5J500	H03F   3/42	99	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
H03F   3/44  \	2	2	5J500	H03F   3/44	0	ŻҴɤΤߤĤ	with tubes only
H03F   3/45  \	1	1	5J500	H03F   3/45	1753	ưΣ	Differential amplifiers [2]
H03F   3/45 109 \	2	2	5J500	H03F   3/45	37	ήз³Τ	PI types
H03F   3/45 110 \	2	2	5J500	H03F   3/45	109	եǥåɥʤĤ	Folded cascode stages
H03F   3/45 210 \	2	2	5J500	H03F   3/45	2316	ήߥ顼ϩĤ	with current mirror circuits
H03F   3/45 220 \	2	2	5J500	H03F   3/45	1336	鵢ԲϩĤ	with feedback circuits
H03F   3/46  \	1	1	5J067	H03F   3/46	75	ȿ	Reflex amplifiers
H03F   3/48  \	2	2	5J067	H03F   3/48	54	ŻҴɤΤߤĤ	with tubes only
H03F   3/50  \	1	1	5J500	H03F   3/50	756	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
H03F   3/52  \	2	2	5J500	H03F   3/52	3	ŻҴɤΤߤĤ	with tubes only
H03F   3/54  \	1	1	5J067	H03F   3/54	63	ŻҴɤޤȾƳ֤Իָ̤Ѥʥѥȥåȣƣοʹ֣ȣΣˡΣ	Amplifiers using transit-time effect in tubes or semiconductor devices (parametric amplifiers H03F 7/00; solid state travelling-wave devices H10N 70/10) [1, 2006.01]
H03F   3/55  \	2	2	5J067	H03F   3/55	84	ȾƳ֤ΤߤĤΡΣ	with semiconductor devices only [2]
H03F   3/56  \	2	2	5J067	H03F   3/56	57	饤ȥѤ	using klystrons
H03F   3/58  \	2	2	5J067	H03F   3/58	119	ʹȴɤѤ	using travelling-wave tubes
H03F   3/60  \	1	1	5J067	H03F   3/60	3513	ϩ֤ʬ㡥ƳȴɶĤΡʣȣƣͥ	Amplifiers in which coupling networks have distributed constants, e.g. with waveguide resonators (H03F 3/54 takes precedence)
H03F   3/62  \	1	1	5J500	H03F   3/62	324		Two-way amplifiers
H03F   3/64  \	2	2	5J500	H03F   3/64	1	ŻҴɤΤߤĤ	with tubes only
H03F   3/66  \	1	1	5J067	H03F   3/66	66	ȿοưȯƱ¾μȿο	Amplifiers simultaneously generating oscillations of one frequency and amplifying signals of another frequency
H03F   3/68  \	1	1	5J500	H03F   3/68	1394	Ȥ߹碌㡥Ωβ¿ͥ	Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics
H03F   3/68 210 \	2	2	5J500	H03F   3/68	582	£ԣ	BTL amplifiers
H03F   3/68 220 \	2	2	5J500	H03F   3/68	2169	³	Parallelly connected amplifiers
H03F   3/68 230 \	2	2	5J500	H03F   3/68	383	ƥ쥪	Parallelly connected amplifiers
H03F   3/70  \	1	1	5J500	H03F   3/70	414	ŲΣ	Charge amplifiers [2]
H03F   3/72  \	1	1	5J500	H03F   3/72	528	ʤ濮ˤäưޤưˤʤΣ	Gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal [2]
H03F   5/00  \	0	0	5J068	H03F   5/00	21	ǻҤȤŻҴɤȾƳ֤򶦤ˤ	Amplifiers with both discharge tubes and semiconductor devices as amplifying elements
H03F   7/00  \	0	0	5J067	H03F   7/00	219	ѥȥåΣ	Parametric amplifiers [2006.01]
H03F   7/02  \	1	1	5J067	H03F   7/02	104	ѥǻҤѤΡƩΨǻҤѤ	using variable-inductance element; using variable-permeability element
H03F   7/04  \	1	1	5J067	H03F   7/04	113	ѥѥǻҤѤΡͶΨǻҤѤ	using variable-capacitance element; using variable-permitivity element
H03F   7/06  \	1	1	5J067	H03F   7/06	32	ŻҥӡɤĤ	with electron beam tube
H03F   9/00  \	0	0	5J068	H03F   9/00	629		Magnetic amplifiers
H03F   9/02  \	1	1	5J068	H03F   9/02	10	ή淿ʤή祳̤äξήΡΣ	current-controlled, i.e. the load current flowing in both directions through a main coil [2]
H03F   9/04  \	1	1	5J068	H03F   9/04	6	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 (H03F 9/06 takes precedence) [2]
H03F   9/06  \	1	1	5J068	H03F   9/06	3	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 [2]
H03F  11/00  \	0	0	5J068	H03F  11/00	18	Ͷ	Dielectric amplifiers
H03F  13/00  \	0	0	5J068	H03F  13/00	66	ŪޤϲŪ˷礵줿ĤѴ狼ʤǻҤѤ㡥õݥޥۥ	Amplifiers using amplifying element consisting of two mechanically- or acoustically-coupled transducers, e.g. telephone-microphone amplifier
H03F  15/00  \	0	0	5J068	H03F  15/00	35	Ūưޤޤʤή̤Ѥ㡥̤ۡѤ	Amplifiers using galvano-magnetic effects not involving mechanical movement, e.g. using Hall effect
H03F  17/00  \	0	0	5J068	H03F  17/00	54	ŵߥͥåǻҤޤϸϤѤ	Amplifiers using electroluminescent element or photocell
H03F  19/00  \	0	0	5J068	H03F  19/00	77	ĶƳ̤Ѥ	Amplifiers using superconductivity effects
H03F  99/00  \	0	0	5J068	H03F  99/00	111	Υ֥饹¾Υ롼פˤʬवʤࡡΣ	Subject matter not provided for in other groups of this subclass [2009.01]
