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

[ASSI]

On Thursday 28 January 2016, 18:41:38, Tom Wiltshire wrote:
> Plus the second amp is going to be amplifying the noise from the first. Is
> that better or worse than having one op-amp with very high-gain
> amplifying it's own noise?

For optimum noise, the first stage of the amplifier cascade should have the 
lowest noise figure and the highest gain of all stages.  There's plenty of 
literature that will walk you through the necessary calculations.  But as 
Roman noted, noise is not the only consideration for high-gain amplifiers, 
so the overall optimum might be someplace else.


Regards,
Achim.
-- 
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