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LMBT5087LT1G Datasheet(PDF) 3 Page - Leshan Radio Company |
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LMBT5087LT1G Datasheet(HTML) 3 Page - Leshan Radio Company |
3 / 6 page LESHAN RADIO COMPANY, LTD. M17–3/6 Noise Figure is Defined as: NF = 20 log 10 ( –––––––––––––––) 1/ 2 e n = Noise Voltage of the Transistor referred to the input. (Figure 3) I n = Noise Current of the Transistor referred to the input. (Figure 4) K = Boltzman’s Constant (1.38 x 10 –23 j/°K) T = Temperature of the Source Resistance (°K) R s = Source Resistance ( Ω ) e n 2 + 4KTR S + I n 2 R S 2 4KTR S LMBT5087LT1 TYPICAL NOISE CHARACTERISTICS (V CE = – 5.0 Vdc, T A = 25°C) f, FREQUENCY (Hz) Figure 1. Noise Voltage f, FREQUENCY (Hz) Figure 2. Noise Current I C , COLLECTOR CURRENT (µA) Figure 3. Narrow Band, 100 Hz I C , COLLECTOR CURRENT (µA) Figure 5. Wideband I C , COLLECTOR CURRENT (µA) Figure 4. Narrow Band, 1.0 kHz BANDWIDTH = 1.0 Hz R S 0 I C=10 µA 100 µA 30 µA 300 µA 1.0mA BANDWIDTH = 1.0 Hz R S I C=1.0mA 300 µA 100 µA 30 µA BANDWIDTH = 1.0 Hz BANDWIDTH = 1.0 Hz NOISE FIGURE CONTOURS (V CE = – 5.0 Vdc, T A = 25°C) 10 7.0 5.0 3.0 2.0 1.0 10 20 50 100 200 500 1.0k 2.0k 5.0k 10k 10 20 50 100 200 500 1.0k 2.0k 5.0k 10k 10.0 7.0 5.0 3.0 2.0 1.0 0.7 0.5 0.3 0.2 0.1 1.0M 500k 200k 100k 50k 20k 10k 5.0k 2.0k 1.0k 500 200 100 10 20 30 50 70 100 200 300 500 700 1.0K 10 20 30 50 70 100 200 300 500 700 1.0K 10 20 30 50 70 100 200 300 500 700 1.0K 0.5dB 1.0dB 2.0dB 3.0dB 1.0dB 2.0dB 3.0dB 5.0dB 0.5dB 1.0dB 2.0dB 3.0 dB 5.0dB 10 Hz to 15.7kHz 10 µA 0.5dB 1.0M 500k 200k 100k 50k 20k 10k 5.0k 2.0k 1.0k 500 200 100 1.0M 500k 200k 100k 50k 20k 10k 5.0k 2.0k 1.0k 500 200 100 5.0dB ~ ~ ~ ~ |
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