impedance matching

noun

Electricity.

1. the technique of choosing or adjusting electric circuits and components so that the impedance of the load is equal to the internal impedance of the power source, thereby optimizing the power transfer from source to load.

impedance matching

1. A technique of electric circuit design in which one component provides power to another, and the output circuit of the first component has the same impedance as the input circuit of the second component. Maximum power transfer is achieved when the impedances in both circuits are exactly the same. Impedance matching is important wherever power needs to be transmitted efficiently, as in the design of power lines, transformers, and signal-processing devices such as audio and computer circuits.

Word History and Origins

Origin of impedance matching¹

First recorded in 1925–30

Example Sentences

Thanks to excellent impedance matching between stages, the amplifiers demonstrated outstanding performance, as Prof. Okada highlights: "The proposed power amplifiers achieved a gain higher than 20 dB from 237 to 267 GHz, with a sharp cut-off frequency to suppress out-of-band undesired signals."

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One of the resonators enables the light coming from the laser to couple with the other resonator; rather like impedance matching in electronics.

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In a statement on Dr. Ehlers’s death, Holt recalled his colleague saying that “we could meet anywhere — even in a phone booth — as long as it had a blackboard where we could discuss such things as the quadrupole moment of the nucleus, or impedance matching of simple machines, or congressional debates.”

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Catherine Carr, a neuroscientist at the University of Maryland, College Park, agrees that the study is "very exciting"—particularly because the katydids have overcome the problem of impedance matching "on such a tiny scale."

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For sensor cells to receive signals, he says, there must be a mechanism for transforming the large, weak airborne sound waves into smaller but more powerful fluid-borne sound waves that the sensor cells can detect—a process called impedance matching.

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