[sdiy] improved dynamic range diffpair-vca

[Magnus Danielson]

From: "JH." <jhaible at debitel.net>
Subject: Re: [sdiy] improved dynamic range diffpair-vca
Date: Wed, 25 Apr 2007 00:25:37 +0200
Message-ID: <001301c786bf$7da661c0$0200a8c0 at jhsilent>

> > To me that looks almost like a free meal. Where's the drawback?
> 
> Is it true that it has 6dB SNR improovement?
> I would expect 3dB ( SQRT(2) times noise, vs. 2 times signal level ) - just 
> as with two pairs in parallel.

This is not a noise improvement as such but rather about being able to use
higher amplitude, and since you can use twice the amplitude for the same
distorsion you get 6 dB in improved SNR.

Cheers,
Magnus