If you amplify 300mV 100 times, the output will be 30V. That is too much for a normal opamp.I want to design an amplifier which would amplify a sinusoidal signal from (0-300mV) at least 100 times.
2.3V/us is only enough for an output of 260mV RMS at 1 MHz.My frequency band is (10khz-1Mhz). Suppose my maximum input change would be around 20mV so I take a slew of around 2.3V/us.
It sounds like there is a problem with the biasing. Can you show your circuit diagram?I am unable to get any amplification rather I am getting the input DC Voltage with a little loss.
Please post your schematic. Another thing for you to analyze the problem is, 10kHz to 1Mhz is quite large range. and amplifying 300mV signal by 100 times gives voltage of 3V. Check the out put stage voltage range.
Right amplifier selection is totally depends upon the input signal nature and its application. Elaborate more of your problem.
Anyways irrespective of applications I shall suggest 3 methods,
1) Use single amplifier with gain 100 and cutoff frequency at >1MHz. Will lead to UGB of around >10Mhz.
2) Use two amplifier stage with each stage gain of 10 and UGB can easily achieved more than 10MHz.
*Case 2 will give you better response and need not to search for specific OPAMP.
3) If you have differential signal , Instrumentation amplifier is best method for many applications.
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Case 1 shows slewing problem most of the time.
That is the slew rate at the input.I assume that to find slew rate we need to Vin*2*3.14.f
That is the slew rate at the input.
Slew rate at the output = Vout*2*3.14.f
The opamp's datasheet shows the maximum slew rate at the output.
Thank you for the information. I am using the following circuit. Anything wrong in it.
Yes. The OP27 is not designed to operate with a single supply. And, even if it did, if your input is a standard AC signal that goes above and below ground you could only amplify the positive half of the signal since there is no negative voltage available.Thank you for the information. I am using the following circuit. Anything wrong in it.
Hi all,
With dual supply I was able to play around with DC voltages, but when I am giving the AC supply voltage, I am getting it amplified but the frequency is not the same.
Hi all,
With dual supply I was able to play around with DC voltages, but when I am giving the AC supply voltage, I am getting it amplified but the frequency is not the same.
To KSHATRIYA: if you have peak voltage of 300mV, then its not possible to get a multiplication factor of 100. T
........... but what in excess I can do to provide better input coupling to transformers output. Any suggestions ?
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