Doug Sax on wire
"Arny Krueger" wrote in message
. ..
"Eeyore" wrote in
message
Well ... the very popular and 'designed for audio' TL07X
series only has 3 MHz GBP !
The difference between -3dB @ 10 KHz and -3 dB at 30 KHz is very audible.
10MHz seems to be more the norm for more modern audio parts.
That pushes the 40 dB gain -3 dB point up to 100 KHz, which is gives
adequate margins.
It's even arguable whether a -3 dB point above 100 KHz is a bug or a
feature!
Yeah, but you don't want that -3dB point to happen because you've run out of
loop gain. It's a good way to get crappy results at high frequencies because
of insufficient feedback.
Quite a few years ago I read an interview with the boss at Benchmark. He was
asked how they get away with using the much-maligned 5532 dual opamp for
most of their designs; he replied, in essence, that if you rolled the
high-frequency response off well before the closed-loop curve ran into the
open-loop, and watched out for loading, the 5532 could give very nice
results. Their products seem to confirm it.
Peace,
Paul
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