2007-03-09 19:05:31 · 3 answers · asked by David Junior 3 in Science & Mathematics ➔ Engineering
The ratio of the value of the feedback resistor to that of the input resistor gives the gain of the amplifier. For example if the feedback resistor is 10kohm and the input resistor is 1kohm then the gain (amplification) of the amplifier is 10/1=10 times. Thus, by changing the values of the input and the feedback resistors you can simply change the gain of the amplifier. Furthermore, output signal will be in opposite phase to the input and this is due to the nature of op amps and it is an answer to another question. Hope this is helpful.
2007-03-11 13:27:52 · answer #1 · answered by East Ender 2 · 1⤊ 0⤋
Input resistors are generally between the signal being amplified and either the inverting or non-inverting input pin of the op-amp. The feedback resistors generally connect from the output of the op-amp, back to one of the inputs, depending on if you are desiring positive feedback or negative feedback.
2007-03-12 14:02:44 · answer #2 · answered by joshnya68 4 · 0⤊ 0⤋
Input resistor sets the DC offset for the input. The feed back helps to ensure stability,as well as help set the gain of the Op Amp stage.
Biasing in these amplifiers is already set by virtue of how the device is built. The DC offset still has to be set however because of differing circuit conditions.
2007-03-10 03:14:25 · answer #3 · answered by Anonymous · 0⤊ 1⤋