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Related Concept Videos

Cascaded Op Amps01:16

Cascaded Op Amps

Operational amplifiers (op-amps) are versatile electronic components that can be interconnected in a cascade - one after another in a linear sequence. This cascading is possible due to their infinite input resistance and zero output resistance, allowing them to maintain their input-output relationships even when connected in series.
In a cascaded system, each op-amp is referred to as a stage. The output of one stage drives the input of the subsequent stage. As the input signal passes through...
MOSFET Amplifiers01:17

MOSFET Amplifiers

The MOSFET, when operating in its active region, functions as a voltage-controlled current source. In this region, the gate-to-source voltage controls the drain current. This principle underlies the operation of the transconductance MOSFET amplifier. The output current is directed through a load resistor to convert this amplifier into a voltage amplifier. The output voltage is then obtained by subtracting the voltage drop across the load resistance from the supply voltage. This process results...
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The specifications for the pre-amplifier were clear. It needed to amplify the audio signal by a factor of 10, have an input impedance above 10...
BJT Amplifiers01:14

BJT Amplifiers

Bipolar Junction Transistors (BJTs) are pivotal components in amplifier circuits, functioning as voltage-controlled current sources in their active region. This characteristic allows them to efficiently control the collector current through variations in the base-emitter voltage. Essentially, BJTs amplify power due to their ability to take a weak input signal and output a much stronger signal.
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Small-Signal Analysis of MOSFET Amplifiers

In small-signal analysis, a MOSFET transistor amplifier acts as a linear amplifier when operating in its saturation region. The gate-to-source voltage (VGS) of the MOSFET is the sum of the DC biasing voltage and the small time-varying input signal. This combination sets up the operating point and modulates the drain current (ID) that flows from the drain to the source. When a small AC signal is superimposed on the DC bias voltage at the gate, the instantaneous drain current comprises three...
Small-Signal Analysis of BJT Amplifiers01:21

Small-Signal Analysis of BJT Amplifiers

Small signal analysis is a fundamental approach used in electronics to understand how a Bipolar Junction Transistor (BJT) amplifier processes signals. In the active region, the BJT is designed for linear amplification. The transistor's behavior under these conditions is governed by its instantaneous base-emitter voltage VBE, a sum of the DC bias VBE, and a small AC signal VBE, resulting in the collector current iC. Here, the collector current has a DC component and an AC component.

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Long span fiber amplifiers.

P Urquhart, T J Whitley

    Applied Optics
    |June 23, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Lightly doped optical fibers can act as distributed amplifiers, overcoming signal loss in long-haul communication links. This approach is compared to traditional systems using discrete amplifiers.

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    Area of Science:

    • Optical Engineering
    • Telecommunications

    Background:

    • Long-haul optical fiber communication systems face significant signal attenuation.
    • Traditional amplification methods often involve discrete amplifier units.
    • Lightly doped optical fibers offer a potential alternative for signal amplification.

    Purpose of the Study:

    • To investigate the theory of optical amplification in long-span, lightly erbium-doped single-mode fibers.
    • To evaluate the feasibility of using the entire communication link as a distributed amplifier.
    • To compare the performance of distributed amplification with discrete amplification systems.

    Main Methods:

    • Theoretical examination of optical amplification principles in lightly doped fibers.
    • Analysis of distributed amplification by pumping from the transmitter end.
    • Comparative study with a system comprising a short-span power amplifier and undoped fiber.

    Main Results:

    • Lightly doped fibers can function as distributed amplifiers when pumped appropriately.
    • Distributed amplification can overcome transmission losses caused by fiber attenuation.
    • The entire communications link can effectively operate as a fiber amplifier.

    Conclusions:

    • Distributed amplification in lightly doped long-span fibers is a viable concept.
    • This approach offers a potential solution for mitigating signal loss in optical networks.
    • Further comparison with discrete amplification systems is warranted.