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THS4022IDGN Datasheet(PDF) 11 Page - Texas Instruments |
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THS4022IDGN Datasheet(HTML) 11 Page - Texas Instruments |
11 / 22 page THS4021, THS4022 350-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS SLOS265B – SEPTEMBER 1999 – REVISED FEBRUARY 2000 11 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 32 shows the noise figure graph for the THS402x. Source Resistance – Ω NOISE FIGURE vs SOURCE RESISTANCE 0 2 4 6 8 10 12 14 16 10 100 1000 10000 10 10 f = 10 kHz TA = 25°C 100 1 k 10 k Figure 32. Noise Figure vs Source Resistance |
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