Question

Problem #2 (2 points) ive resistance of 1 MOhm. Calculate the shot noise when using three A system has an effecti different bandwidth oscilloscopes (80 GHz, 200 MHz, and 50 MHz), assuming that the different scopes do not alter the effective resistance Problem #3 (2 points) Which signal is most likely to suffer from 1/noase? Which signal is most likely to suffer from thermal noise? (a) 1Hz (b) 10Hz (c) 100Hz (d) 1kHz

Answer 1

"(a) 1 H_2 The thermal noise generally best optimize the noise figure for higher frequency so if suffer from low frequency line ""1 Hz"" Resistance = 1 mw = 1 times 10^6 w Find short Noise = for (80 mHz, 200 mHz, 50 mHz) so Root mean square Theorem Noise. rightarrow V_rms = squareroot 4 k TR Delta f (for 80 kHz) R = 1 mw = 1 times 10^6 w Delta f = 80 GHz = 80 times 10^9 Hz Boltzman constant k = 1.38 times 10^-23 r/k Temp = 298 k V_rms = squareroot 4 times 1.38 times 10^-23 times 298 times 1 times 10^6 times 80 times 10^9 = squareroot 1.3159 times 10^-3 = 0.0362 V mean square theorem Noise 0.0362 V for f = 200 mHz = 200 times 10^6 Hz V_rms = squareroot 4 k TR Delta f \r\n V_rms = squareroot 4 times 1.3 times 10^-23 times 298 times 1 times 10^6 "