I'm designing some audio-frequency instrumentation for my workbench and am using TL074s for most opamp requirements. One section requires microvolt measurements and noise is therefore an issue.
It's often difficult comparing opamps on noise and other figures because they're often stated differently in the datasheets, so choosing something else, e.g. OP07, has several unknowns.
A better solution might be a discrete differential preamp using either FETs or bipolars, but a similar problem of calculating comparative performance arises.
Can anyone offer some broad suggestions as to the likely benefits of a discrete preamp, along with such factors as noise versus collector current and so forth?
It's often difficult comparing opamps on noise and other figures because they're often stated differently in the datasheets, so choosing something else, e.g. OP07, has several unknowns.
A better solution might be a discrete differential preamp using either FETs or bipolars, but a similar problem of calculating comparative performance arises.
Can anyone offer some broad suggestions as to the likely benefits of a discrete preamp, along with such factors as noise versus collector current and so forth?