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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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THS6092/3 датащи(PDF) 20 Page - Texas Instruments |
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THS6092/3 датащи(HTML) 20 Page - Texas Instruments |
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20 / 46 page  THS6042, THS6043 350 mA, ±12 V ADSL CPE LINE DRIVERS SLOS264G − MARCH 2000 − REVISED DECEMBER 2001 20 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION noise calculations and noise figure (continued) This brings up another noise measurement usually preferred in RF applications, the noise figure (NF). Noise figure is a measure of noise degradation caused by the amplifier. The value of the source resistance must be defined and is typically 50 Ω in RF applications. NF + 10log e 2 ni e Rs 2 Because the dominant noise components are generally the source resistance and the internal amplifier noise voltage, we can approximate noise figure as: NF + 10log 1 ) e n 2 ) IN ) R S 2 4kTR S Figure 39 shows the noise figure graph for the THS6042/3. 0 2 4 6 8 10 12 14 16 10 100 1 k 10 k RS − Source Resistance − Ω f = 10 kHz TA = 25°C Figure 39. Noise Figure vs Source Resistance |
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