hiii guys

im doing my FYP on amplify the voltage from a rogowski coil

just to make it short
i have already design the coil
which can detect a 300k frequency and gives Vp-p = 55mV
now, i have to design an amplifier that can give an actual value.

so, i design the amplifier in both way which are non inverter and inverter
but in both cases my result was an expected
wish is Zero volt.

im suing ic- LT1014
and my ( Rf = 100 K ohms , Ri = 1 K ohms )
so, my Gain is ( G = 100 )
but i still get the wrong result .

i got a helped before, but unfortunately i couldnt find the ICs
because its not available in the market

is it my mistake is
using LT1014 ???? or what ????

 

You might post your schematic.

The LT1014 is a precision quad op amp, but not particularly fast. If you are trying to get all that gain in one stage, the device just can't do it. The data sheet says the output only slews at 400 mv/second, pretty slow to follow 300 KHz. In a simulator, try all four sections, with gains of 3, 3, 3, and 4 (108 overall) to see if it can hack it.

If not, look at a faster op amp - http://www.linear.com/pc/productDetail.jsp?navId=LT1630

 

the output only slews at 400 mv/second,

Actually, 400 mV / usec.

 

Oops, that's even worse than a 741.

 

so thats mean your advice is to change my IC LT1014 to LT1630 ????

 

i have tried to make the gain 3, 3, 3, 4 (108)
but it doesn't work

im planing to buy LT 1230 ??? and its expensive
should i go a head or what ????

 

You could try that. It should be fast enough, but realizing a gain of 100 in a single stage at that frequency may be interesting. Get LTspice from Linear technology and simulate the amplifier.

We do not have your schematic to look at, so there is quite a bit of guesswork involved.

 

that is my schematic bro
but my problem is now the ICs of amplifier
even LT1230 i couldnt find it
and im running out of the time.
so, what do you suggest ????