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The customer would like to select an op amp and need us to provide an available circuit.
His requirements are as below:
1. The input signal is the 1mV amplitude wiht 2MHZ sine.
2. He would like to use single power supply.
3. He need to amplify 2000~3000 times.
4. The output voltage should be 0~3.3V. The output signal is used as the input signal of ADC.
I think this should use the double power supply.
Would you help me to select a suitable op amp and send me a TINA circuit?
The attach is a TINA circuit for this application. Can anyone check it?High gain.TSC
Best Wishes, Mickey Zhang Asia Customer Support Center Texas Instruments
Regards,Ronald MichallickLinear Applications
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In reply to Ron Michallick:
In reply to Mickey Zhang:
Jacob Freet High Speed Amplifiers
it's very difficut to achieve high gain with single power supply because when doing the biasing lots of the supply noise is injected into the signal path. So, lots of filtering is needed to keep the bias free from noise. In the following I have drawn a schematic with four OPA300. Three OPA300 provide a gain of 10, one OPA300 will give a gain of 2. More gain per single OPAmp stage isn't possible with the OPA300 because loop gain would drop too much and distortion would become too high:
A double power supply would render all this bias filtering unnecessary!
The first gain stage is non-inverting. This allows a low noise feedback loop with small R2 (100R) and a rather high input impedance of 1k at the same time. The overall distortion is only 0.35%.
In reply to Jacob%20Freet:
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