5-1: Answer the following a) What types of noise are frequency dependent? Which

Question

5-1: Answer the following a) What types of noise are frequency dependent? Which are frequency independent? b) Name the type(s) of noise that can be reduced by: i. Decreasing the temperature of a measurement device ii Increasing the frequency at which measurements are made ii. Decreasing the bandwidth of the measurement Suggest a frequency range that is well-suited for noise-minimization of low frequency measurements via modulation/demodulation. Describe how modulation is accomplished to perform this frequency conversion c) d) What type of noise is likely to be reduced by i) a high-pass filter and ii a low-pass filter? e) Calculate the rms thermal noise associated with a 1.0 M load resistor operated at room temperature if an oscilloscope with a 1 MHz bandwidth is used to make measurements. If the bandwidth is reduced to 100 Hz, by what factor will the noise be reduced?

Explanation / Answer

ans a) Flicker Noise and Environmental noise are frequency dependent.

b)

i. THERMAL NOISE can be reduced by decreasing temperature.

ii. Flicker noise. Its magnitude is inversely proportional to frequency.

iii. Shot noise and thermal noise can be reduced by decreasing bandwidth.

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