Wireless Communication Electronics: Introduction to RF by Robert Sobot

By Robert Sobot

This booklet is meant for senior undergraduate and graduate scholars in addition to working towards engineers who're considering layout and research of radio frequency (RF) circuits.  distinct tutorials are incorporated on all significant subject matters required to appreciate basic ideas in the back of either the most sub-circuits required to layout an RF transceiver and the entire communique method. beginning with evaluation of basic ideas in electromagnetic (EM) transmission and sign propagation, via specific sensible research of RF amplifier, mixer, modulator, demodulator, and oscillator circuit topologies, the entire approach to the process communique concept at the back of the RF transceiver operation, this ebook systematically covers all suitable features in a manner that's compatible for a unmarried semester college point path.

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Example text

If the frequencies are not the same than there is not much left to say, but to note existence of two relatively independent waves. However, if the two waves do have the same frequency (and not necessarily the same amplitude), than it makes sense to ask which wave arrives first. To answer that question, let us set up a “race”. The initial phase of one of the two waves is arbitrarily declared the zero-phase reference. The stopwatch starts when the first wave’s amplitude crosses the zero-amplitude value, for instance, on its way from higher amplitudes to lower amplitudes (in technical terms, on its “falling edge”).

However, a more complicated waveform, such as y(t) in Fig. 13, is not that easy to analyze by visual inspection only, because it is defined by its amplitude, frequency and phase parameters in the time domain plot. 10). It is very useful to create a plot that shows the relationship among all the harmonics in the frequency–power domain. 10), in order to transform it into its equivalent frequency spectrum function, Fig. 14. For the purpose of frequency domain plots, it is common practice to convert units of amplitude (for instance, volts or amperes) into decibels (dB) (a unit of relative power).

The wavelength is a secondary phenomenon depending on the speed of the wave. To support this 10 The correct term should be velocity, but most books (wrongly) use the speed instead. 14 1 Introduction Fig. 5 observation, imagine sending a sound of the same frequency through two parallel channels, water and air. 9)—when λ → 4λ and ν → 4ν , the frequency stays the same. 4. For a voltage disturbance wave travelling at the speed of light and described as v1 = sin(20π × 106 t) find: (a) (b) (c) (d) (e) Its maximum amplitude Its frequency Its period Its wavelength Its phase at time t = 0 s For a second wave v2 with the same maximum amplitude and with a phase difference of Δ φ = +45◦ , find its amplitude at time t = 0 and the distance between one of its peaks and the following v1 peak.

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