It is better to explain the frequency and the function of the operational amplifier..
2007-03-07 02:07:05 · 5 answers · asked by David Junior 3 in Science & Mathematics ➔ Engineering
No Electrical device can have a zero resistance output once a 'load' has been put onto it.
2007-03-07 02:12:29 · answer #1 · answered by Doctor Q 6 · 0⤊ 0⤋
The infinite input resistance and zero output resistance is often how the op-amp is modeled, because the op-amp will not drop any of its voltage from input to output, rather the op-amp does what it can with supply power to make the voltages at the inputs and output equal. So if you have 6V at say the negative input, the op amp will supply current at the output in hopes of feeding 6V back to the positive input. Once all transients have diminished, and assuming you don't have the op-amp thrown to either supply rail, the input and output voltages will be the same.
2007-03-09 14:58:14 · answer #2 · answered by joshnya68 4 · 0⤊ 0⤋
The operational amplifier because of it's very high open loop gain and the use of negative feedback can have a very high input impedance (not infinite) and a very low output impedance (not zero). A basic understanding of the operational amplifier can be obtained from this web site:
http://ourworld.compuserve.com/homepages/Bill_Bowden/opamp.htm
2007-03-07 10:43:06 · answer #3 · answered by indyacom 3 · 1⤊ 0⤋
Virtual earth input and not really zero impedance o/p http://www.play-hookey.com/analog/opamp_characteristics.html
2007-03-07 10:13:23 · answer #4 · answered by Del Piero 10 7 · 0⤊ 0⤋