noise figure การใช้
- An amplifier with a 0 dB noise figure would be perfect.
- Thus, the noise figure of tube amplifiers increases with frequency.
- The noise figure in this case is 20 dB.
- In most cases only the noise figure of the first stage need be considered.
- The total noise factor can then be used to calculate the total noise figure.
- To obtain low noise figure the impedance of the source can be increased by a transformer.
- At 800 MHz, tubes like EC8010 have noise figures of about 10 dB or more.
- To obtain low noise figure, the impedance of the source can be increased by a transformer.
- From those measurements and the characteristics of the noise source, the noise figure can be calculated.
- Noise generators are used to test signals for measuring noise figure, frequency response, and other parameters.
- Mixer circuits are characterized by their properties such as conversion gain ( or loss ), and noise figure.
- The low-noise quality of an LNB is expressed as the noise figure ( or sometimes noise temperature ).
- The noise figure of a valve is inversely proportional to its transconductance; higher transconductance generally means lower noise figure.
- The noise figure of a valve is inversely proportional to its transconductance; higher transconductance generally means lower noise figure.
- Noise figure is not usually an issue for power amplifier valves, however, in receivers using valves it can be important.
- An equivalent definition is : noise figure is the factor by which insertion of the amplifier degrades the signal to noise ratio.
- Some commercial microwave noise generators use avalanche diodes to create a large excess noise figure that can be turned off and on.
- Noise figure in an ideal DFA is 3 dB, while practical amplifiers can have noise figure as large as 6 8 dB.
- Noise figure in an ideal DFA is 3 dB, while practical amplifiers can have noise figure as large as 6 8 dB.
- Noise figure is a measure of the noise produced by a receiver compared to an ideal receiver, and this needs to be minimized.
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