2007-03-13 20:59:53 · 4 answers · asked by e r 1 in Science & Mathematics ➔ Engineering
The input impedance or load impedance of a circuit or electronic device is the impedance actually experienced by a signal which is connected to its input. For example, an amplifier with 100,000 ohm input impedance looks equivalent to a 100,000 ohm resistor to the device driving it.
The output impedance, source impedance, or internal impedance of an electronic device is the opposition exhibited by its output terminals to the flow of an alternating current (AC) of a particular frequency as a result of resistance, inductance and capacitance.
The impedance at DC (frequency of 0) is the same as the resistance component of the impedance and is termed output resistance.
It is important to realize that no real device (battery, generator, amplifier) is a perfect source; all have an internal impedance, though this may have negligible effect, depending on the load.
2007-03-13 21:07:56 · answer #1 · answered by Anonymous · 3⤊ 0⤋
The op-amp is basically a differential amplifier having a large voltage gain, very high input impedance and low output impedance. The op-amp has a "inverting" or (-) input and "noninverting" or (+) input and a single output. The op-amp is usually powered by a dual polarity power supply in the range of +/- 5 volts to +/- 15 volts. A simple dual polarity power supply is shown in the figure below which can be assembled with two 9 volt batteries.
2007-03-14 04:10:42 · answer #2 · answered by smurf133 1 · 0⤊ 0⤋
I believe that you need to actually *read* and *study* your textbook.
Doug
2007-03-14 04:22:48 · answer #3 · answered by doug_donaghue 7 · 2⤊ 0⤋
huh?
2007-03-14 04:02:30 · answer #4 · answered by Ran C 2 · 0⤊ 1⤋