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LM741 voltage at 1Mhz frequency

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azlanrizal1976

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Hi, i'm trying to make a buffer amplifier using ic LM741. I want to input a 1Mhz 10Vpp sine wave. I would like to know, is it the output buffer voltage will remain same 10Vpp at 1Mhz frequency?
 

Read 741 datasheet, look at slew rate specification (typical 0.5 V/µs).
Calculate maximum triangle and undistorted sine voltage at 1 MHz according to this specification.
 


andre_teprom said:
No, LM741 is an Op Amp designed to work with signals with frequencies in the audible range.
Click to expand...
I don't think so. The audible range goes to 20kHz. The slew rate graph of the 741 opamp that was released 47 years ago shows that it has trouble with high level signals above only 9kHz.
Its output swing at 1MHz is ZERO but then it has no gain and will not oscillate anyway.
 

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An ideal opamp has infinite gain-bandwidth product. Of course real opamps have finite GBW.

This was the most powerful and versatile opamp of yesteryears. Sorry, it cannot handle 1MHz.
 

there have to be thousands of op amps that have sufficient gain and slew rate to do this. why the heck would you want to use a 741?
 

This was the most powerful and versatile opamp of yesteryears. Sorry, it cannot handle 1MHz.
Click to expand...
In the 741 ages, no designer had seriously considered to drive 1 MHz 10Vpp with an OP.
 

Any suggestion for common subtitution parts which can used for 1Mhz?
 

You need an OP with > 32 v/µs slew rate and sufficient GBW margin, e.g. 20 or 50 MHz. There's no "common substitution part" but you can find suitable devices from every major manufacturer. No sense of suggesting a specific part which is not available at your local market.
 

FvM said:
In the 741 ages, no designer had seriously considered to drive 1 MHz 10Vpp with an OP.
Click to expand...

I remember MARVELING at my first OP-27, which actually had something like 50 V/uS, and thought that was BLAZINGLY fast.
 

LM318 is an relative old standard OP that could be used (50 V/µs, 15 MHz GBW).
 

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