Science Fair Project Encyclopedia
Input impedance
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
See also
- Impedance
- Output impedance
- Source impedance
- internal impedance
- Damping factor
- Voltage divider
- Dummy load
External links
10-26-2009 08:16:03
The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details
The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details