Decibel and Noise Flashcards
(40 cards)
Fundamental quantity representing the rate at which energy is used.
Power
Logarithmic unit that can be used to measure ratio (indicates the relation between two powers).
Decibel
Random, undesirable electrical energy that enters the communication system via the communicating medium and interferes with the transmitted message.
Noise
changed in signal shape of the waveform
Distortion
any contamination by extraneous or external signals (mixing of signals). “to disturb or detract from”
Interference
signal amplitude degradation
Attenuation
noise present regardless if there is a signal or not
uncorrelated noise
noise that cannot be present unless there is a signal
correlated noise
unwanted multiples of single frequency in nonlinear amplification
harmonic distortion/amplitude distortion
unwanted cross product
Intermodulated Noise
any device created by humans that produce noise, affects frequency up to 500 MHz
Man-made noise
caused by lightning charges, affects frequencies below 30 MHz
Atmospheric/Static noise
Electrical signals that originate from outside Earth’s atmosphere.
Space/Extraterrestrial Noise
Solar cycles happen every ______
11 years
Supercycle happens every _______
99 years
rapid and random movement of electrons within a conductor. It is temperature dependent and affects all frequencies.
Thermal/Johnson/Gaussian/White Noise
random variations in current flow specifically in active devices. It is commonly found in devices with PN junctions.
Shot Noise
low frequency noise affecting MOS.
Flicker/Excess/(1/f)/Pink Noise
low frequency noise that affects BJT.
Burst/Popcorn Noise
noise commonly found in transistors, shot noise but occurs in devices where single current separates into two or more paths.
Partition/Transistor Noise
noise that sounds the same to the ears regardless of frequency
Gray Noise
clashing, displeasing noise. “out of tune”
Orange Noise
background noises of the world
Green Noise
Silent noise (noise consisting of mostly silence)
Black Noise
