A measure of the ability of an amplifier to increase the strength of a signal while adding the minimum possible self-generated noise. It is mathematically equal to ten times the log of the input S/N ratio to the output S/N ratio
Measurement of noise contribution of an amplifier relative to a noise-free amplifier at a reference temperature. Usually expressed in dB for Ku-band amplifiers.
A measure of the performance (noise contribution) of an LNBF in decibels. The lower this figure, the better.
This figure is used to describe the noise level present in a particular device. It is expressed in decibels (dB) and compares the device in question with an imaginary perfect (and unattainable) device.
A term which is a figure of merit of a device, such as an LNA or receiver, expressed in dB, which compares the device with a perfect device.
The ratio of the input signal to noise ratio to the output signal to noise ratio for a circuit or system, expressed in decibels. The noise figure of a receiver determines the minimum detectable signal amplitude.
The noise figure is the ratio of the actual noise power generated at the input of an amplifier to that which would be generated in an ideal resistor. Noise figures should be as low as possible for optimum performance.
The noise figure is the standard measurement for the performance of LNB's. As the LNB ‘tunes' your satellite TV signal, it strives to lower the noise figure. Noise figure is usually measured in dB. You should look for a noise figure anywhere between dB 0.7 and dB 0.4. Anything higher will not give you the quality that you would expect from a satellite system.
A measure of the noise in dB generated at the input of an amplifier as compared with the noise generated by a 75-ohm resistor.
Measure of the performance (noise contribution) of an LNB in dB. The lower the figure, the better.
An expression of noise generated with in a device specified in dB. This parameter is important in RF application such as a receive antenna switching system and IF signal routing. The lower the noise figure, the better.
Measures the thermal noise contribution of LNAs and receiver front ends.
A method for quantifying the electrical noise generated by a practical device. The noise figure is the ratio of the noise power at the output of a device to the noise power at the input to the device, where the input noise temperature is equal to the reference temperature (290 K). The noise figure is usually expressed in decibels.
A measure of the noisiness of an amplifier. Noise factor is defined as input signal-to-noise ratio to output signal-to-noise ratio. Noise figure is noise factor expressed in dB. The lowest possible value for a matched system is 3 dB. The ratio of the actual noise power generated at the input of an amplifier to that which would be generated in an ideal resistor. The lower the noise figure, the better the performance.
(Or noise factor.) A number by which the performance of a radio receiver can be specified. Essentially, the noise figure is the ratio of the noise generated by the actual receiver to the noise output of an "ideal" receiver with the same overall gain and bandwidth when the receivers are connected to a room temperature load. The noise power from a simple load is equal to kTB, where is Boltzmann's constant; the absolute temperature of the load, for example, resistor; and the measurement bandwidth. See also noise level, signal-to-noise ratio.
The ratio of the output signal-to-noise ratio to the input signal-to-noise ratio for a given element in a transmission system. Used for optical and electrical components.
In telecommunication, noise figure (NF) is the ratio of the output noise power of a device to the portion thereof attributable to thermal noise in the input termination at standard noise temperature (usually 290 K). The noise figure is thus the ratio of actual output noise to that which would remain if the device itself did not introduce noise. It is a number by which the performance of a radio receiver can be specified.