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buffer amplifier low voltage to higher voltage

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flabbergastt

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Hi guys,

This might be a vague question, I'm still quite new to electronics. I have a two stage op-amp attached below that is simulated using LTSpice used as a buffer amplifier. Suppose that it operates as a low voltage buffer (supply is 0v to 2v, input is 0 to 2v, so output is 0 to 2v) limited due to the low voltage transistors in the circuit.

Suppose now I want it to be able to output 0 to 10v, so the input and supply is also between 0 to 10v. How could I effectively do this? I have higher voltage transistor models in LTSpice, could I just replace all the lower voltage transistors with higher voltage transistors?

any input is appreciated!

thanks

5271035600_1412327394.jpg
 

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hi,
You could use a higher supply voltage to the amp, select suitable MOSFET's from the 'F2' lib in LTSpice.
Adjust the Bias to suit.
Post your asc file.
E
 

esp1 said:
hi,
You could use a higher supply voltage to the amp, select suitable MOSFET's from the 'F2' lib in LTSpice.
Adjust the Bias to suit.
Post your asc file.
E
Click to expand...

Could you give me a hint to which transistors I need to uprate?

thanks!
 

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Last edited:

Could you give me a hint to which transistors I need to uprate?
Click to expand...

hi,
The choice of FET's will depend upon the Output Current, the Bandwidth Frequency of the amp and the Voltage levels of the driving signal and Bias.

Do you have a specification for the amplifiers performance.?
E
It would help if you posted your LTS asc files, so I can duplicate your simulations.
 

Hey esp1,
Heres the asc file. I'll have to do some readings on what you've mentioned as I have not considered all of that.
I'm just wondering if its possible to increase the output swing of the buffer to 0-10v (assuming the circuit I have now is unable to go that high) as efficient as possible.

any input is appreciated,
Thanks!
 

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  • opamp.rar
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