Download e-book for kindle: Modern electronic communication by Jeffrey S. Beasley

By Jeffrey S. Beasley

ISBN-10: 1292025476

ISBN-13: 9781292025476

Presents an advent to digital communications whereas reflecting the speedy adjustments and enhancements happening within the box. Miller covers issues starting from electric noise to digital/data communications, microwaves and fibre optics.

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The circuit losses (mainly the de winding resistance of the coil) cause the output to become gradually smaller as this process repeats itself after the complete collapse of the magnetic field. The resulting waveform, shown in Figure 21(b), is termed a damped sine wave. The energy of the magnetic field has been converted into the energy of the capacitor's Ve /Time of switch closing ] L Current flow maximum c \Magnetic field fully collapsed R (a) Tank circuit FIG URE 21 (b) Flywheel effect Tank circu it flywhee l effect.

TANGENTiAl NoisE MEASUREMENT lECHNi<;>uE Meters capable of accurately measuring the very low levels involved with noise measurements tend to be expensive and of limited use with regard to other applications. A dual-trace oscilloscope with high sensitivity is an exception to this limitation. Unfortunately, a direct noise reading from the scope results in errors for two reasons: l. 2. Tangential Method method of measuring the amp Iitude of noise on a signal using an oscilloscope display Noise is of a highly random nature and is not sinusoidal.

Scope settings are: horizonta l = 500 ms/cm, vertical = 20 mV/cm. ) dual-trace scope with alternate sweep capability. As shown in Figure 8(a), the two displayed signals are set up with both channels identically calibrated. Then their vertical position is adjusted until the dark band between them just disappears [Figure 8(b)]. Now the noise signal input to both channels is removed, and the resulting separation represents twice therms noise. 8 cm X 20 m V/cm + 2, or 8 mV rms. Repeating this process with a different scope intensity setting [Figures 8(d), (e), and (f)] yields the same result.

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Modern electronic communication by Jeffrey S. Beasley


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