[sdiy] Maxim analog switch ICs

[Michael Boracci]

Does anyone know if the diodes that are used to create the virtual ground
add any significant amount of noise to the incoming signal? Do they have to
be matched or of any specific type?

This could save a few bucks if it is clean enough.


MB

-----Original Message-----
From: owner-synth-diy at dropmix.xs4all.nl
[mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of Steve Ridley
Sent: Saturday, November 15, 2003 7:06 AM
To: synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] Maxim analog switch ICs


> Here it is:
> http://www.uni-bonn.de/~uzs159/Switching.png
>
> However it is still untested, but I don't see any reason why not.
> Should be working with that 4052 also.

That system has been used in a variety of well known "top end"
professional mixing desks for many years, and works very well.

Typically signals would be high level (opamps running at up to ±18v)
but the CMOS switches would be run off ±5v.

They usually added another switch between the input resistor/switch
input node and 0v.   This would switch on and short the signal to
ground when the signal wasn't selected.  This reduces breakthrough
significantly.


Steve





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