[sdiy] The future of synth DIY

[Grant Richter]

It has been a whiles since I looked at them. One problem was the lack of
support for log/expo functions. Also you would have to use multipliers
instead of OTAs and there are range problems with that. It is a great idea,
I just wish they took it further.

> From: "Curtin, Steven D (Steven)" <sdcurtin at agere.com>
> Reply-To: owner-synth-diy at node12b53.a2000.nl
> Date: Fri, 2 Mar 2001 12:56:05 -0500
> To: Synth-DIY list <synth-diy at node12b53.a2000.nl>, "'Scott
> Bernardi'"<sbernardi at home.net>
> Subject: RE: [sdiy] The future of synth DIY
> 
> Has anyone tried the programmable analog systems that are starting to come
> out?  This is one possibility, like an FPGA only analog.  I've done some
> FPGA work in the past couple of years, which promises to allow you to make
> your own digital ICs, albiet with lower density and speed.  There are now
> app notes on the Lattice site for VCOs and VCAs for ispPAC 10 device.
> 
> Here's some web sites:
> 
> Lattice ispPAC:
> http://www.latticesemi.com/products/devices/isppac.cfm
> 
> Anadyne/Anadigm:
> http://www.anadyne-micro.com/
> 
> Fast Analog Solutions:
> http://www.fas.co.uk/
> 
> Steve C
> 
> -----------------------------------------------------------------
> Steven Curtin  
> Agere Systems (formerly
> Lucent Technologies Microelectronics)
> ph: (732)949-4404   fax: (732)949-6711
> http://curtin.emf.org
> sdcurtin at agere.com
> -----------------------------------------------------------------
> 
> 
>> ----------
>> From:  Scott Bernardi[SMTP:sbernardi at home.net]
>> Sent:  Friday, March 02, 2001 9:18 AM
>> To:  Synth-DIY list
>> Subject:  Re: [sdiy] The future of synth DIY
>> 
>> How useful this process is would also depend on the type of transistors
>> that could be manufactured.  If they're talking about doing logic with
>> it, it's probably some form of MOS. Can bipolar transistors be made? I
>> don't think you can get a decent exponential response out of a MOS
>> transistor - it's more of a square law.
>>> :::    It would be a dream come true....
>>> 
>>> or a nightmare. Analog design for logic process is a pain in the a**.
>>> Even if you have a process more suitable for analog purposes
>>> you still need to fight down all kinds of problems you'll never
>>> encounter in discrete circuits. There is nothing like resistors
>>> from the shelf, capacitors, and neglegible parasitics.
>>> 
>