Example 1: The equation of an angle modulated signal is: PFM (t) = 10 cos(10³t + 3 sin 10¹t) volts Determine: (a) The carrier & modulating frequencies. (b) The modulation index and peak frequency deviation. (c) The power dissipated in a 1000 resistor.

Define the following conceptsa. Positive modulation percentageb. Modulation efficiencyc. Signal strengthd. At least one technique for building an AM transmitter.

Explain the difference between AC small signal amplifiers. from power amplifiers.

Multiple-choice questions: 1. When BJTs are used in digital circuits they usually operate in the: a. active region b. breakdown region c. saturation and cutoff regions d. linear region   2. Often a common-collector will be the last stage before the load; the main function(s) of this stage is to: a. provide voltage gain b. provide phase inversion (Inverting) c. provide a high-frequency path to improve the frequency response d. buffer the voltage amplifiers from the low-resistance load and provide impedance matching for maximum power transfer   3. A decrease in base current of a C.E. amplifier causes the voltage measured between the emitter and the collector to increase. a. True b. False