[sdiy] Spare op-amp useful in gain stage?

[Roman Sowa]

In high gain application it's better to split to 2 opamps, this way you 
get much higher bandwidth than when done on single opamp.
For example if 60dB gain on one opamp would have 3dB bandwidth ending at 
about 10kHz, while 30+30dB on 2 opamps of the same kind it jumps over 
300kHz.

Roman

W dniu 2016-01-28 o 13:03, Mattias Rickardsson pisze:
> Hi!
>
> I was in a discussion about what to do with a spare OP-amp. These
> fellows come in duals and quads, and sometimes the quantities don't
> end up perfectly and you stand there with an extra unused op-amp.
>
> Is there any clever way of using two op-amps instead of one in, say, a
> noisy high-gain stage in order to reach lower noise or something like
> that?
>
> Douglas Self's small signal book suggests paralleling two gain stages
> ("multipath amplifiers"), having their outputs tied together with 10
> ohms to the destination, winning 3 dB SNR. Are there other clever ways
> of using a spare op-amp, particularly in a stage with high gain?
>
> /mr
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