Input impedance
From Wikipedia, the free encyclopedia.
The input impedance or load impedance of a circuit or electronic device is the impedance actually experienced by a signal which is connected to it.
For example, an amplifier with 100,000 ohm input impedance looks equivalent to a 100,000 ohm resistor to the signal coming into it.
Generally in audio and hi-fi, the input impedance of components is several times higher than the output impedance connected to them. This is called voltage bridging or impedance bridging. In this case,
- Zload >> Zsource
In video and other systems the impedance of inputs and outputs are the same. This is known as impedance matching or a matched connection. In this case,
- Zload = Zsource
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See also
- Impedance
- Output impedance
- Source impedance
- internal impedance
- Damping factor
- Voltage divider
- Dummy load
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External links
- Calculation of the damping factor and the damping of impedance bridging (http://www.sengpielaudio.com/calculator-bridging.htm)de:Eingangswiderstand
