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What is Noise Figure - measurement ... - Electronics Notes
https://www.electronics-notes.com/articles/radio/radio-receiver-sensitivity/what-is-noise-figure-measurement-calculation-formula.php#:~:text=Noise%20figure%20is%20a%20number%20by%20which%20the,noise%20an%20element%20adds%20to%20the%20overall%20system.
Understanding Noise Figure - QSL.net
https://www.qsl.net/va3iul/Noise/Understanding%20Noise%20Figure.pdf
The concept of Noise Figure allows the sensitivity of any amplifier to be compared to an ideal (lossless and noiseless) amplifier which has the same bandwidth and input termination. • Noise Figure (NF) is a measure of how much a device (such an amplifier) degrades the Signal to Noise ratio (SNR). SNR_input [linear] = Input_Signal [Watt] / Input_Noise
Op Amp Noise Figure: Don't Be Mislead
https://www.analog.com/media/en/training-seminars/tutorials/MT-052.pdf
Noise Figure = NF = 10 log. 10. F. Figure 5: Noise Figure for Op Amps . In RF or IF gain blocks, the input impedance is defined. However, when using an op amp in the non-inverting mode as a gain block, the input impedance is high (relative to transmission line impedances), and there are several options regarding the input termination which affect the noise figure.
Noise in Audio Amplifiers
https://www.sound-au.com/noise.htm
With a noise figure of 5nV / √Hz, the equivalent input noise (E IN) is therefore ... 5nV × 141 = 707nV If we assume a typical gain of a sensitive microphone stage (for example) as 100 (40dB) and an output level of 1V (0dBv), this means that the output noise equals the input noise, multiplied by gain.
Understanding Op Amp Noise in Audio Circuits
https://www.ti.com/lit/pdf/sboa345
understand what this noise looks like in an amplifier circuit. Amplifier noise can be simplified by modeling it as an external voltage noise e. n(v) on the positive terminal of the amplifier as shown in Figure 2-1. Figure 2-1. Voltage Noise Amplifier voltage noise can be broken down into two main components: flicker noise and broadband noise.
The Design of Low-noise Audio-frequency Amplifiers
http://www.keith-snook.info/Stuff-you-should-read/Faulkner%20-%20The%20design%20of%20Low-noise%20audio%20frequency%20amplifiers.pdf
Now if we calculate the way in which the noise figure of the most general linear amplifier can vary with Rs, making no assump tions apart from that of linearity, we find the relation F = 1+kl/Rs+Rs/k2+k3 ...... (4) July 1968 where kl, k2 and 3 are constants of the amplifier, all being in general functions of frequency.
Application Note of Noise Figure Measurement Methods
https://dl.cdn-anritsu.com/en-en/test-measurement/files/Application-Notes/Application-Note/ms269xa-2830a-017-ef1300.pdf
In a linear amplifier, the ratio of the signal to the noise ( SNR ) is expressed by an index called the Noise Figure ( NF It is defined as the ratio of SNR_out (output signal noise ratio) to SNR_in (input SNR), and although it may be expressed differently according to the literature, in most cases, this ratio is called F (Noise Factor).
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