Chapter 5: Q. 5.1 (page 110)
What types of noise are frequency dependent? Frequency independent?
The flicker noise and environmental noise are frequency-dependent, and the thermal noise and shot noise are frequency independent.
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The following data were collected for a voltage measurement, in mV a noisy system: 1.25, 1.74, 1.33, 1.97, 1.10, 1.27, 1.54, 1.62.
(a) Assuming the noise is random, what is the signal-to-noise ratio?
(b) How many measurements would have to be averaged to increase S / N to 10 ?
Calculate the improvement in S / N in progressing from the top spectrum to the bottom in Figure 5-10. By what factor is the S / N of the bottom spectrum improved over the middle spectrum?
If spectrum A in Figure 5-2 is the result of a single scan and spectrum B is the result of ensemble averaging, how many individual spectra were summed to increase S / N from 4.3 to 430 ?
Calculate the improvement in S/N in progressing from spectrum A to spectrum D in Figure 5-15
Calculate the rms thermal noise associated with load resistor operated at room temperature if an oscilloscope with a 1-MHz bandwidth is used. If the bandwidth is reduced to 100 Hz by what factor will the noise be reduced?
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