Free Essay

My Alyzamer

In: Computers and Technology

Submitted By calecalemark
Words 504
Pages 3
Allyzzamer M. Tudio
BSIT-2A

Small Signal Amplifier
A "small" signal in the context of "small signal" analysis relates to the linear approximation of a transistor model around it's operating point. In the presence of a "small" signal the output is a replica of the input except for a change in amplitude. In simple terms this means that a sine wave in gives you a sine wave out. That is the hallmark of a linear system.
Large Signal Amplifier
A large signal will however make the device operate in a non-linear fashion by clipping the output or introducing various kinds of distortion. This is why you cannot turn the volume on an amplifier all the way up to the maximum value because even small input signals will be reduced to unintelligible hash.

Amplifier Circuit
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Amplifier Signal Block

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Example of schematic Diagram

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Devices/Components in an amplifier

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Define the following:
Signal - A signal as referred to in communication systems, signal processing, and electrical engineering "is a function that conveys information about the behavior or attributes of some phenomenon". In the physical world, any quantity exhibiting variation in time or variation in space (such as an image) is potentially a signal that might provide information on the status of a physical system, or convey a message between observers, among other possibilities. The IEEE Transactions on Signal Processing states that the term "signal" includes audio, video, speech, image, communication, geophysical, sonar, radar, medical and musical signals.
Amplifier - An amplifier is an electronic device that increases the voltage, current, or power of a signal. Amplifiers are used in wireless communications and broadcasting, and in audio equipment of all kinds. They can be categorized as either weak-signal amplifiers or power amplifiers.
Cut-off - is a state of negligible conduction that is a property of several types of electronic components when a control parameter (that usually is a well-defined voltage or electric current, but could also be an incident light intensity or a magnetic field), is lowered or increased past a value (the conduction threshold). The transition from normal conduction to cut-off can be more or less sharp, depending on the type of device considered, and also the speed of this transition varies considerably.
Active- The essential role of this active element is to magnify an input signal to yield a significantly larger output signal. The amount of magnification (the "forward gain") is determined by the external circuit design as well as the active device.
Saturation- refers to "maximum",beyond which the system becomes unstable. if a device reaches its maximum voltage when a certain amount of current is gives as input,then the amount of current is known as saturation current and for voltage its vice versa.
Gain- is a measure of the ability of a two port circuit (often an amplifier) to increase the power or amplitude of a signal from the input to the output port by adding energy converted from some power supply to the signal.

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