QPSK

Binary Signal

Due to the problems aloof discussed, abnormally the actuality that both abrasion and advancement acceleration are abundance dependent, it is abominable to accept a advanced ambit of frequencies in the signal. Unfortunately, the aboveboard after-effects acclimated in agenda signals accept a advanced abundance spectrum and appropriately are accountable to able abrasion and adjournment distortion. These [...]

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Light Activated SCR

Like bipolar transistors, SCRs and TRIACs are also manufactured as light-sensitive devices, the action of impinging light replacing the function of triggering voltage. Optically-controlled SCRs are often known by the acronym LASCR, or Light Activated SCR. Its symbol, not surprisingly, looks like this: Optically-controlled TRIACs don’t receive the honor of having their own acronym, but [...]

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Hysteresis

Thyristors are a class of semiconductor components exhibiting hysteresis, that property whereby a system fails to return to its original state after some cause of state change has been removed. A very simple example of hysteresis is the mechanical action of a toggle switch,when the lever is pushed, it flips to one of two extreme [...]

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Junction Field Effect Transistor

A transistor is a linear semiconductor device that controls current with the application of a lower-power electrical signal. Transistors may be roughly grouped into two major divisions: bipolar and field-effect. In the last chapter we studied bipolar transistors, which utilize a small current to control a large current. In this chapter, we’ll introduce the general [...]

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Square Wave Pulse Signal Generator

To overcome the challenge of creating necessary DC bias voltage for an amplifier’s input signal without resorting to the insertion of a battery in series with the AC signal source, we used a voltage divider connected across the DC power source. To make this work in conjunction with an AC input signal, we “coupled” the [...]

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Meter Check of a Transistor

Meter Check of a Transistor: Bipolar transistors are constructed of a three-layer semiconductor “sandwich,” either PNP or NPN. As such, they register as two diodes connected back-to-back when tested with a multimeter’s “resistance” or “diode check” functions: Look at the picture of diode check functions: Here assuming the use of a multimeter with only a [...]

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Standing Waves

Whenever there is a mismatch of impedance between transmission line and load, reflections will occur. If the incident signal is a continuous AC waveform, these reflections will mix with more of the oncoming incident waveform to produce stationary waveforms called standing waves. The following illustration shows how a triangle-shaped incident waveform turns into a mirror [...]

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Examples of Superposition Theorem in Circuit

Superposition theorem is one of those strokes of genius that takes a complex subject and simplifies it in a way that makes perfect sense. A theorem like Millman’s certainly works well, but it is not quite obvious why it works so well. Superposition, on the other hand, is obvious.The strategy used in the Superposition Theorem [...]

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Low Pass Filters Circuit

A low pass filter circuit is a circuit offering easy passage to low frequency signals and difficult passage to high-frequency signals. There are two basic kinds of circuits capable of accomplishing this objective, and many variations of each one: The inductive low pass filter in Figure 18.1 and the capacitive low-pass filter in Figure 18.3 [...]

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