3.1

What are the sources of noise?

3.2

Which source of noise has 1/ f characteristics?

3.3

What passive component should be avoided for low-noise design?

3.4

What active component should be avoided for low-noise design?

3.5

Which noise source requires that dc current be present?

3.6

What are the main advantages of equivalent-input noise sources?

3.7

What is noise figure, and why should you use it?

3.8

An amplifier chain has 60 dB of gain and a 10-dB noise figure. You are assigned to design a low-noise amplifier with 20-dB gain and 20-dB noise figure after this stage. What conditions have to occur for the noise figure of this amplifier to have an equal amount of noise contributed to its output?

3.9

Name the five spectral-density power laws and plot their responses.

3.10

Plot the five spectral power laws for an oscillator's phase noise. Assume a new power law is dominant in each decade.

3.11

Derive the closed-loop transfer function for an oscillator, using feedback theory and (3.51) through (3.54).

3.12

An amplifier has a noise figure of 6 dB, a gain of 10 dB, a flicker corner frequency of 100 kHz, and a 1-dB saturation level of +10 dBm. Calculate the oscillator's phase-noise response from 1-Hz to 10-MHz offset frequencies when a resonator with an unloaded Q of 1,000, a center frequency of 50 MHz, and an insertion loss of 12 dB is connected...