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Related Concept Videos

Gain01:15

Gain

Gain and phase shift are properties of linear circuits that describe the effect a circuit has on a sinusoidal input voltage or current. The circuit's behavior that contains reactive elements will depend on the frequency of the input sinusoid. As a result, it is observed that the gain and phase shift will all be frequency functions.
Gain:
Suppose Vin is the input and Vout is the output signal to a circuit.
Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any finite,...
Small-Signal Analysis of MOSFET Amplifiers01:23

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...
Design Example: Vintage Mixing Console01:17

Design Example: Vintage Mixing Console

A sound engineer at a music company recently encountered a problem. The output from their newly acquired studio's vintage mixing console was too low for the requirements of modern recording equipment. To rectify this situation, the engineer decided to design an audio pre-amplifier using an operational amplifier (op-amp) to boost the signal level.
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...
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...

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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Optimal signal-to-noise in digital phase lock amplifiers.

C R Doering, P M Harvey

    Applied Optics
    |May 11, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study presents an optimal signal-to-noise ratio method for linear phase lock amplifiers. The technique effectively removes detector time constants in noise-limited systems, improving optical detection efficiency.

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    Area of Science:

    • * Electrical Engineering
    • * Optical Physics
    • * Signal Processing

    Background:

    • * Linear phase lock amplifiers are crucial for signal detection.
    • * Detector time constants can limit system efficiency in noise-limited scenarios.

    Purpose of the Study:

    • * To derive an optimal signal-to-noise ratio (SNR) expression for linear phase lock amplifiers.
    • * To analyze the digital implementation of this optimal method using real-time signal processing.
    • * To investigate the impact of the optimal method on detector-noise-limited systems.

    Main Methods:

    • * Derivation of an optimal SNR expression.
    • * Analysis of real-time digital signal processing techniques for implementation.
    • * Detailed examination of detector-noise-limited systems.

    Main Results:

    • * An optimal SNR expression for linear phase lock amplifiers was derived.
    • * The optimal method, when digitally implemented, can effectively eliminate the detector's time constant as a limiting factor.
    • * Significant improvements in overall efficiency for optical detection systems are possible.

    Conclusions:

    • * The derived optimal method enhances the efficiency of linear phase lock amplifiers, particularly in detector-noise-limited systems.
    • * Digital implementation via real-time signal processing is practical and effective.
    • * The findings have direct implications for the design of advanced optical detection systems.