Can we gain any amount of voltage amplification through the ratio rf/r1 ?

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desperado1

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Can we gain any amount of voltage amplification through the ratio rf/r1 ?
 

Re: Op amp question

no the supply voltage limits the output voltage.we can't get a voltage greater than the supply voltage
 

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    desperado1

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Re: Op amp question

also the frequency of input signal will reduce the gain
so one must take care of Gain-frequency response
 

Re: Op amp question

Obviously Rf/R1 is the gain factor and it is obviously a gain factor as long as Rf/R1 is greater than unity, (inverting configuration)
 

Re: Op amp question

giri_lp,
The exact expression for the maximum DC gain for the inverting configuration is, (where G is the open loop gain of the Op-Amp):
.
A = 1/((1/G) + (Ri/Rf)((1/G)+1)))
So the maximum achievable gain, which occurrs when Ri/Rf = 0, is equal to the open loop gain loop gain G. The 1/G factors can only be ignored when the desired closed loop gain is much smaller than the open loop gain. In this case, the above expression reduces to A = Rf/Ri.
regards,
Kral
 

Re: Op amp question

the op amp is limited to its power supply

when you thick in logically you will not ever get an output power than the input power
the input power is "dc power supply "
 

Re: Op amp question

no because supply voltage is in limit
 

Op amp question

No ...!!!! if your voltage gain is greater than your supply voltage sources then your gain clliped at your maximum source voltage...
 

Op amp question

maximum output voltage:1-2 volt lower than +vcc,-vcc.
 

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