Version: 2023.08
Loading Scheme...
CPC | COOPERATIVE PATENT CLASSIFICATION | |||
| H03G | CONTROL OF AMPLIFICATION (impedance networks, e.g. attenuators, H03H; control of transmission in lines H04B 3/04) [2018-08] NOTES
WARNING
|
H03G 1/00 | Details of arrangements for controlling amplification {(for arrangements combined with means for generating a controlling signal, or these means per se, see the other main groups of H03G)} [2013-01] |
H03G 1/0005 | . | {Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal} [2013-01] |
H03G 1/0011 | . . | {the device being at least one of the amplifying tubes of the amplifier} [2013-01] |
H03G 1/0017 | . . | {the device being at least one of the amplifying solid state elements of the amplifier} [2013-01] |
H03G 1/0023 | . . . | {in emitter-coupled or cascode amplifiers (H03G 1/0029 takes precedence)} [2015-07] |
H03G 1/0029 | . . . | {using FETs} [2013-01] |
H03G 1/0035 | . . | {using continuously variable impedance elements} [2013-01] |
H03G 1/0041 | . . . | {using thermistors} [2013-01] |
H03G 1/0047 | . . . | {using photo-electric elements} [2013-01] |
H03G 1/0052 | . . . | {using diodes} [2013-01] |
H03G 1/0058 | . . . . | {PIN-diodes} [2013-01] |
H03G 1/0064 | . . . . | {Variable capacitance diodes} [2013-01] |
H03G 1/007 | . . . | {using FET type devices} [2013-01] |
H03G 1/0076 | . . . | {using galvanomagnetic elements} [2013-01] |
H03G 1/0082 | . . . | {using bipolar transistor-type devices} [2013-01] |
H03G 1/0088 | . . | {using discontinuously variable devices, e.g. switch-operated} [2013-01] |
H03G 1/0094 | . . . | {using switched capacitors} [2013-01] |
H03G 1/02 | . |
H03G 1/04 | . | Modifications of control circuit to reduce distortion caused by control (modifications to reduce influence of variations of internal impedance of amplifying elements caused by control H03F 1/08) [2013-01] |
H03G 3/00 |
H03G 3/001 | . | {Digital control of analog signals} [2013-01] |
H03G 3/002 | . | {Control of digital or coded signals (H03G 3/3089 take precedence)} [2013-01] |
H03G 3/004 | . | {Control by varying the supply voltage} [2013-01] |
H03G 3/005 | . | {Control by a pilot signal (H03G 3/001 takes precedence)} [2013-01] |
H03G 3/007 | . | {Control dependent on the supply voltage} [2013-01] |
H03G 3/008 | . | {Control by switched capacitors} [2013-01] |
H03G 3/02 | . |
H03G 3/04 | . . | in untuned amplifiers [2013-01] |
H03G 3/06 | . . . | having discharge tubes [2013-01] |
H03G 3/08 | . . . . | incorporating negative feedback [2013-01] |
H03G 3/10 | . . . | having semiconductor devices [2013-01] |
H03G 3/12 | . . . . | incorporating negative feedback [2013-01] |
H03G 3/14 | . . | in frequency-selective amplifiers [2013-01] |
H03G 3/16 | . . . | having discharge tubes [2013-01] |
H03G 3/18 | . . . | having semiconductor devices [2013-01] |
H03G 3/20 | . | Automatic control ({H03G 3/005 takes precedence } ; combined with volume compression or expansion H03G 7/00) [2013-01] |
H03G 3/22 | . . | in amplifiers having discharge tubes [2013-01] |
H03G 3/225 | . . . | {controlling or controlled by the (local) oscillators of a (super)heterodyne receiver} [2013-01] |
H03G 3/24 | . . . | Control dependent upon ambient noise level or sound level [2013-01] |
H03G 3/26 | . . . | Muting amplifier when no signal is present {or when only weak signals are present, or caused by the presence of noise, e.g. squelch systems} [2013-01] |
H03G 3/28 | . . . . | in frequency-modulation receivers {; in angle-modulation receivers} [2017-08] |
H03G 3/30 | . . | in amplifiers having semiconductor devices [2013-01] |
H03G 3/3005 | . . . |
H03G 3/301 | . . . . | {the gain being continuously variable} [2013-01] |
H03G 3/3015 | . . . . . | {using diodes or transistors} [2013-01] |
H03G 3/3021 | . . . . . | {by varying the duty cycle} [2013-01] |
H03G 3/3026 | . . . . | {the gain being discontinuously variable, e.g. controlled by switching} [2013-01] |
H03G 3/3031 | . . . . . | {using switched capacitors} [2013-01] |
H03G 3/3036 | . . . | {in high-frequency amplifiers or in frequency-changers (H03G 3/3052, H03G 3/32, H03G 3/34 take precedence)} [2013-01] |
H03G 3/3042 | . . . . | {in modulators, frequency-changers, transmitters or power amplifiers (transmission power control in bidirectional transmission systems H04W 52/04)} [2013-01] |
H03G 3/3052 | . . . |
H03G 3/3057 | . . . . | {using at least one diode as controlling device} [2013-01] |
H03G 3/3063 | . . . . | {using at least one transistor as controlling device, the transistor being used as a variable impedance device} [2013-01] |
H03G 3/3068 | . . . . | {Circuits generating control signals for both R.F. and I.F. stages} [2013-01] |
H03G 3/3073 | . . . . | {Circuits generating control signals when no carrier is present, or in SSB, CW or pulse receivers} [2013-01] |
H03G 3/3078 | . . . . | {Circuits generating control signals for digitally modulated signals} [2013-01] |
H03G 3/3084 | . . . |
H03G 3/3089 | . . . | {Control of digital or coded signals} [2013-01] |
H03G 3/3094 | . . . |
H03G 3/32 | . . . | the control being dependent upon ambient noise level or sound level [2013-01] |
H03G 3/34 | . . . | Muting amplifier when no signal is present {or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems} [2013-01] |
H03G 3/341 | . . . . | {Muting when no signals or only weak signals are present (H03G 3/344, H03G 3/345 take precedence)} [2013-01] |
H03G 3/342 | . . . . | {Muting when some special characteristic of the signal is sensed which distinguishes it from noise, e.g. using speech detector (H03G 3/344, H03G 3/345 take precedence)} [2013-01] |
H03G 3/344 | . . . . | {Muting responsive to the amount of noise (noise squelch) (H03G 3/345 takes precedence)} [2013-01] |
H03G 3/345 | . . . . | {Muting during a short period of time when noise pulses are detected, i.e. blanking (H03G 3/348 takes precedence)} [2013-01] |
H03G 3/347 | . . . . . | {dependent on the rate of noise pulses} [2013-01] |
H03G 3/348 | . . . . | {Muting in response to a mechanical action or to power supply variations, e.g. during tuning; Click removal circuits} [2013-01] |
H03G 5/00 | Tone control or bandwidth control in amplifiers [2013-01] |
H03G 5/005 | . | {of digital signals (see provisionally also H03G 5/00)} [2013-01] |
H03G 5/02 | . |
H03G 5/025 | . . | {Equalizers; Volume or gain control in limited frequency bands} [2013-01] |
H03G 5/04 | . . | in untuned amplifiers [2013-01] |
H03G 5/06 | . . . | having discharge tubes [2013-01] |
H03G 5/08 | . . . . | incorporating negative feedback [2013-01] |
H03G 5/10 | . . . | having semiconductor devices [2013-01] |
H03G 5/12 | . . . . | incorporating negative feedback [2013-01] |
H03G 5/14 | . . | in frequency-selective amplifiers [2013-01] |
H03G 5/16 | . | Automatic control [2013-01] |
H03G 5/165 | . . | {Equalizers; Volume or gain control in limited frequency bands} [2013-01] |
H03G 5/18 | . . | in untuned amplifiers [2013-01] |
H03G 5/20 | . . . | having discharge tubes [2013-01] |
H03G 5/22 | . . . | having semiconductor devices [2013-01] |
H03G 5/24 | . . | in frequency-selective amplifiers [2013-01] |
H03G 5/26 | . . . | having discharge tubes [2013-01] |
H03G 5/28 | . . . | having semiconductor devices [2013-01] |
H03G 7/00 |
H03G 7/001 | . | {without controlling loop (H03G 7/007, H03G 7/02, H03G 7/06 take precedence)} [2013-01] |
H03G 7/002 | . | {in untuned or low-frequency amplifiers, e.g. audio amplifiers (H03G 7/007, H03G 7/001, H03G 7/008, H03G 7/02, H03G 7/06 take precedence)} [2016-08] |
H03G 7/004 | . . | {using continuously variable impedance devices} [2013-01] |
H03G 7/005 | . . | {using discontinuously variable devices, e.g. switch-operated} [2013-01] |
H03G 7/007 | . | {of digital or coded signals (see provis. also H03G 7/00)} [2013-01] |
H03G 7/008 | . | {Control by a pilot signal (H03G 7/007, H03G 7/02, H03G 7/06 take precedence)} [2013-01] |
H03G 7/02 | . | having discharge tubes [2013-01] |
H03G 7/04 | . . | incorporating negative feedback [2013-01] |
H03G 7/06 | . | having semiconductor devices [2013-01] |
H03G 7/08 | . . | incorporating negative feedback [2013-01] |
H03G 9/00 | Combinations of two or more types of control, e.g. gain control and tone control [2013-01] |
H03G 9/005 | . | {of digital or coded signals} [2015-07] |
H03G 9/02 | . |
H03G 9/025 | . . |
H03G 9/04 | . . | having discharge tubes [2013-01] |
H03G 9/06 | . . . | for gain control and tone control [2013-01] |
H03G 9/08 | . . . . | incorporating negative feedback [2013-01] |
H03G 9/10 | . . . | for tone control and volume expansion or compression [2013-01] |
H03G 9/12 | . . | having semiconductor devices [2013-01] |
H03G 9/14 | . . . | for gain control and tone control [2013-01] |
H03G 9/16 | . . . . | incorporating negative feedback [2013-01] |
H03G 9/18 | . . . | for tone control and volume expansion or compression [2013-01] |
H03G 9/20 | . | in frequency-selective amplifiers [2013-01] |
H03G 9/22 | . . | having discharge tubes [2013-01] |
H03G 9/24 | . . | having semiconductor devices [2013-01] |
H03G 9/26 | . |
H03G 9/28 | . . | all amplifying stages having discharge tubes [2013-01] |
H03G 9/30 | . . | all amplifying stages having semiconductor devices [2013-01] |
H03G 11/00 | Limiting amplitude; Limiting rate of change of amplitude {; Clipping in general} [2017-08] |
H03G 11/002 | . | {without controlling loop (H03G 11/004, H03G 11/006, H03G 11/008, H03G 11/02, H03G 11/04, H03G 11/06, H03G 11/08 take precedence; see provisional also H03G 11/00)} [2013-01] |
H03G 11/004 | . | {using discharge tubes (H03G 11/008 takes precedence)} [2013-01] |
H03G 11/006 | . | {in circuits having distributed constants (H03G 11/008 takes precedence)} [2013-01] |
H03G 11/008 | . | {of digital or coded signals (see provis. also H03G 11/00, H03G 11/02)} [2013-01] |
H03G 11/02 | . |
H03G 11/025 | . . | {in circuits having distributed constants} [2013-01] |
H03G 11/04 | . | Limiting level dependent on strength of signal; Limiting level dependent on strength of carrier on which signal is modulated {(H03G 11/008 takes precedence)} [2013-01] |
H03G 11/06 | . | {Limiters of angle-modulated signals}; such limiters combined with discriminators (H03G 11/00 takes precedence; discriminators having an inherent limiting action H03D 3/00) [2013-01] |
H03G 11/08 | . |
H03G 99/00 | Subject matter not provided for in other groups of this subclass [2013-01] |
H03G 2201/00 | Indexing scheme relating to subclass H03G [2013-01] |
H03G 2201/10 | . | Gain control characterised by the type of controlled element [2013-01] |
H03G 2201/103 | . . | being an amplifying element [2013-01] |
H03G 2201/106 | . . | being attenuating element [2013-01] |
H03G 2201/20 | . | Gain control characterized by the position of the detection [2013-01] |
H03G 2201/202 | . . | being in baseband [2013-01] |
H03G 2201/204 | . . | being in intermediate frequency [2013-01] |
H03G 2201/206 | . . | being in radio frequency [2013-01] |
H03G 2201/208 | . . | being in power supply of the amplifier [2013-01] |
H03G 2201/30 | . | Gain control characterized by the type of controlled signal [2013-01] |
H03G 2201/302 | . . | being baseband signal [2013-01] |
H03G 2201/305 | . . | being intermediate frequency signal [2013-01] |
H03G 2201/307 | . . | being radio frequency signal [2013-01] |
H03G 2201/40 | . | Combined gain and bias control [2013-01] |
H03G 2201/50 | . | Gain control characterized by the means of gain control [2013-01] |
H03G 2201/502 | . . | by switching impedance in feedback loop [2013-01] |
H03G 2201/504 | . . | by summing selected parallel amplifying paths, i.e. more amplifying/attenuating paths summed together [2013-01] |
H03G 2201/506 | . . | by selecting one parallel amplifying path [2013-01] |
H03G 2201/508 | . . | by using look-up tables [2013-01] |
H03G 2201/60 | . | Gain control characterized by varying time constants in control loop [2013-01] |
H03G 2201/603 | . . | time constant being continuous [2013-01] |
H03G 2201/606 | . . | time constant being discrete [2013-01] |
H03G 2201/70 | . | Gain control characterized by the gain control parameter [2013-01] |
H03G 2201/702 | . . | being frequency, e.g. frequency deviations [2013-01] |
H03G 2201/704 | . . | being number of multiplexed channels [2013-01] |
H03G 2201/706 | . . | being quality indicator, e.g. BER,C/I [2013-01] |
H03G 2201/708 | . . | being temperature [2013-01] |