Analog Sequencer/Sampler? (e)eprom

[Martin Czech]

I didn't say it is a superiour solution.
It's more on the crap side...

m.c.

:::From: Jay Martin <jmar at intface.com>
:::To: Martin Czech <czech at Micronas.Com>, patchell at silcom.com
:::Cc: synth-diy at node12b53.a2000.nl
:::Subject: RE: Analog Sequencer/Sampler? (e)eprom
:::Date: Fri, 11 Aug 2000 13:59:49 -0400
:::
:::There are problems with this approach to analog storage as well.
:::
:::I am reminded of the old Luxor satellite receivers I used to service.
:::The Luxor worked with a down-converter that used a tuning voltage for
:::channel selection.  The Luxor receiver then had an analog memory system
:::not unlike the "flash" you are describing to remember the station voltage
:::for each transponder.  This gave it alot of flexability.  
:::
:::As the parts would age, however, the voltages in the memory cells would 
:::begin to drift, requiring re-alignment.  Eventually, individual cells
:::would go bad completely, causing channels that could no longer be 
:::programmed. 
:::
:::My $.02
:::Jay
:::
:::-----Original Message-----
:::From: Martin Czech [mailto:czech at Micronas.Com]
:::Sent: Friday, August 11, 2000 12:35 PM
:::To: patchell at silcom.com
:::Cc: synth-diy at node12b53.a2000.nl
:::Subject: Re: Analog Sequencer/Sampler? (e)eprom
:::
:::
:::
::::::    As far as I know, you are not going to be able to store an analog
:::value 
:::in a
::::::bit of an (e)eprom.  If perfermance is what you want, I don't think you
:::be 
:::
:::Why not? Basically by writing ereasable devices you change
:::the threshold voltage of some NMOST. Be it Nordheim-Fowler
:::tunneling or hot electrons from drain.
:::I.e. you change the characteristic of an analogue device.
:::The read out value (drain current) is therefore an analog thing.
:::
:::Of course, memory designers take a great pain in turning
:::this analog information into bits by elaborated read amplifiers,
:::but principally analog storage is possible.
:::
:::What about Holtech chips? I think they store voice via these ideas.
:::
:::Analog says nothing about discrete time or not.
:::Are BBDs digital??
:::
:::
:::There was a company in California ("San"), they proposed multi
:::level storage in FLASH, ie. each cell could have up to 256
:::different levels, this would mean 8 bits in the area of formerly one.
:::
:::Of course, this was (too) demanding.
:::
:::m.c.