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Gain control in amplifiers or frequency changers without distortion of the input signal
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Industry
CPC
H03G3/00
This industry / category may be too specific. Please go to a parent level for more data
Parent Industries
H
ELECTRICITY
H03
Electronic circuits
H03G
CONTROL OF AMPLIFICATION
Current Industry
H03G3/00
Gain control in amplifiers or frequency changers without distortion of the input signal
Sub Industries
H03G3/001
Digital control of analog signals
H03G3/002
Control of digital or coded signals
H03G3/004
Control by varying the supply voltage
H03G3/005
Control by a pilot signal
H03G3/007
Control dependent on the supply voltage
H03G3/008
Control by switched capacitors
H03G3/02
Manually-operated control
H03G3/04
in untuned amplifiers
H03G3/06
having discharge tubes
H03G3/08
incorporating negative feedback
H03G3/10
having semiconductor devices
H03G3/12
incorporating negative feedback
H03G3/14
in frequency-selective amplifiers
H03G3/16
having discharge tubes
H03G3/18
having semiconductor devices
H03G3/20
Automatic control
H03G3/22
in amplifiers having discharge tubes
H03G3/225
controlling or controlled by the (local) oscillators of a (super)heterodyne receiver
H03G3/24
Control dependent upon ambient noise level or sound level
H03G3/26
Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise
H03G3/28
in frequency-modulation receivers; in angle-modulation receivers
H03G3/30
in amplifiers having semiconductor devices
H03G3/3005
in amplifiers suitable for low-frequencies
H03G3/301
the gain being continuously variable
H03G3/3015
using diodes or transistors
H03G3/3021
by varying the duty cycle
H03G3/3026
the gain being discontinuously variable
H03G3/3031
using switched capacitors
H03G3/3036
in high-frequency amplifiers or in frequency-changers
H03G3/3042
in modulators, frequency-changers, transmitters or power amplifiers
H03G3/3047
for intermittent signals
H03G3/3052
in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
H03G3/3057
using at least one diode as controlling device
H03G3/3063
using at least one transistor as controlling device, the transistor being used as a variable impedance device
H03G3/3068
Circuits generating control signals for both R.F. and I.F. stages
H03G3/3073
Circuits generating control signals when no carrier is present, or in SSB, CW or pulse receivers
H03G3/3078
Circuits generating control signals for digitally modulated signals
H03G3/3084
in receivers or transmitters for electromagnetic waves other than radiowaves
H03G3/3089
Control of digital or coded signals
H03G3/3094
in parametric amplifiers
H03G3/32
the control being dependent upon ambient noise level or sound level
H03G3/34
Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise signals
H03G3/341
Muting when no signals or only weak signals are present
H03G3/342
Muting when some special characteristic of the signal is sensed which distinguishes it from noise
H03G3/344
Muting responsive to the amount of noise (noise squelch)
H03G3/345
Muting during a short period of time when noise pulses are detected
H03G3/347
dependent on the rate of noise pulses
H03G3/348
Muting in response to a mechanical action or to power supply variations
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