Download Radio Receiver Design by McClaning K., Vito T. PDF

By McClaning K., Vito T.

Single-source guide on receiver layout. comprises huge chapters on mixers, oscillators, filters, and amplifiers. Covers intimately all significant parts relating to receiver layout, together with cascade interplay offers first-class introductions and technical history on uncomplicated in addition to complicated part features, that includes «war stories,» routines, layout examples and an abundance of worthy drawings and tables. Serves as a reference software for college students and pros of electric engineering, RF and microwave electronics and radio receiver layout. Emphasizes functional and confirmed recommendations that aid make clear the function of every part in the layout.

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Example text

With a complex load, the timedomain examples are harder to visualize because of the frequency-dependent nature of the load. 100 where ZL = RL + j X L = the complex load (resistance and reactance), p = the complex reflection coefficient, IpI = the magnitude of the complex reflection coefficient, OD = the angle of the complex reflection coefficient. A complex p means that the incident wave suffers a phase change as well as a magnitude change when it encounters the mismatch. All the equations concerning return loss will also apply for the complex reflection coefficient.

Everything is the same except for one minor detail - the return pulse has the same magnitude, but it is opposite in polarity. The short circuit at the end of the cable causes the pulse to come back upsidedown or inverted. Z, Terminated Line Figure 1-ll(d) shows a terminated cable with a resistor whose value equals the characteristic impedance of the cable. No pulse returns because the matched load resistor absorbs all of the energy in the pulse. This is usually a desirable situation and one of the reasons to keep system impedances matched.

Reflections still occur as the wave encounters mismatched impedances. However, because of the continuous nature of the sine wave, the effects are not as intuitive as in the pulsed case. Figure 1-17 shows an example where the voltage generator Vg is a sine- wave source that turns on at time t = 0. When we turn the signal generator on at t = 0, the sine wave first encounters the mismatch between the signal generator’s source impedance and the impedance of the transmission line. This effect acts to reduce the voltage incident on the line.

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