sreejuviswan
Newbie level 1
For one of my projects I am using 2 stage amplification. the first stage of amplification is done by a LMV324 opamp under the difference input configuration. for The second stage i need a programmable gain amplifier hence i tried using MCP6s21 PGA. this PGA has amplification gain setting of +1, +2, +4,+5,+8,+10,+16 or +32. However when i analyse the output signal the amplification does not happen as expected for a gain set at +8 the amplification is only twice the input signal and for +16 and +32 setting there is only noise in the output.
My signal frequencies are not more than 2 KHz and the datasheet claims that this PGA could handle upto 18 MHz.
Why is the opamp performing so poorly? is it because the opamp has poor performance or because i have not chosen the right opamp for my application? what are the opamp parameters i should look into for choosing the right amplifier?
My signal frequencies are not more than 2 KHz and the datasheet claims that this PGA could handle upto 18 MHz.
Why is the opamp performing so poorly? is it because the opamp has poor performance or because i have not chosen the right opamp for my application? what are the opamp parameters i should look into for choosing the right amplifier?