Re: op-amps with wide open-loop bandwidth ?

Dave Moore wrote:
Oops, "unity" isn't what I meant. I mean, I want
any op-amp that is flat (more or less) to 20Khz
I'm not looking for any specific specs beyond that,
so it's V/mv gain curve isn't so important as long as
long as it's reasonable to 20KHz also

I'm simply looking for a wide variety of op-amp types
for sonic evaluation. IOW, I'm attempting to correlate
what my ear hears with with the variations in specs
from one op-amp to another and sadly deficient
in the list of op-amps I've evaluated so far are any
that are flat open-loop to 20Khz or higher. The best
I have on hand are 10KHz.

So far my short list of star performers via the
old golden ear test are;
THS4022, THS4052, THS4062, THS4012,
AD828, LT1363

Although it should be mentioned that these are
for guitar amplifiers and that Audio Hi-Fi enthusiasts
might not agree about the merits of the afore mentioned.

The whole idea of opamps is that, if they have enough extra gain to throw away, at the frequencies you are interested in, then they all act the same. But the definition of "enough extra gain" is highly dependent on the circuit they are part of. In other words, if the opamp is fast enough and has high enough gain, it disappears as a source of sound color, and the other, more predictable components in the circuit, program its output, almost completely. The effect of gain on, say, a unity gain follower is very different than the effect of gain on a distortion effect generator, at the same frequency. So, before any suggestion is likely to help you, we need to understand a lot more about what circuit you intend to use this opamp in.

And since, it is fairly obvious that you are not yet a circuit designer, you would probably get a more helpful response if you start over in sci.electronics.basics

Good luck.
.

Relevant Pages

  • Re: op-amps with wide open-loop bandwidth ?
    ... :> I'm not looking for any specific specs beyond that, ... The whole idea of opamps is that, if they have enough extra gain to ... the circuit, program its output, almost completely. ... There are op-amps with specs far exceeding your ...
    (sci.electronics.design)
  • Re: Need help with active filters ???
    ... These days op-amps are nearly self-compensated, which means that you can just implement the "feedback resistor input resistor have a nice day" circuit and it will be stable. ... When you wrap the op-amp with resistors to get a finite gain, the resistors only determine the circuit gain as long as the op-amp gain by itself is well in excess of the design circuit gain. ...
    (sci.electronics.basics)
  • Re: why do we prefer to supply voltages at the inverting terminal of an op-amp???
    ... asking why the input signal to an op-amp circuit is very often ... parameters as the overall gain, ... just use the inverting input of the op-amp to achieve this, ...
    (sci.electronics.basics)
  • Optimising yer gain bandwidth
    ... such stuff but one thing they said wuz that your op-amp needed sufficient ... gain bandwidth to ensure that all things would be fruity pie. ... slope compensation works for voltage mode converters as well. ...
    (sci.electronics.design)
  • Re: OP-Amps and A to D
    ... My actual applications is wanting to take transducer signals, amplify ... you don't want to tell him where the gain set pin is on an op-amp? ...
    (sci.electronics.design)