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In electrical engineering, the output impedance of an electrical network is the measure of the opposition to current flow (impedance), both static (resistance) and dynamic (reactance), into the load network being connected that is internal to the electrical source.
30 Μαΐ 2023 · If your headphones sound dull, your guitar feels lifeless, or your home stereo sounds muddy, you might be dealing with output impedance. Here's what you need to know about output impedance and why it's such a drag on your stereo.
In more technical terms, the flow of current of both the input and output is controlled by the input and output impedance of the amplifier. This tutorial clarifies the notions of input and output amplifiers impedances by explaining the previously mentioned concept of “box”.
Output impedance is a design issue when using rail to rail output op amps to drive heavy loads. If the load is mainly resistive, the output impedance limits how close to the rails the output can go. If the load is capacitive, the extra phase shift erodes the phase margin.
4 Ιαν 2018 · Technically, it's the impedance between your input node and a fixed voltage. This could be ground, or it could be a power rail. Also, remember that you're not setting a current input, you're setting a voltage input.
22 Ιουν 2013 · The short answer: input impedance is "high" (ideally infinite). Output impedance is "low" (ideally zero). But what does this mean, and why is that useful? Impedance is the relationship between voltage and current. It's a combination of resistance (frequency-independent, resistors) and reactance (frequency-dependant, inductors and capacitors).
Mathematically, the output resistance or impedance of a device is the derivative $$r_{out}=\frac{dv_{out}}{di_{out}}$$ where \$i_{out}\$ is considered positive when it flows in to the device (the passive current convention). If we only consider the DC (or quasi-static) behavior, we call this a resistance.
