[sdiy] OTA performance (was SSM chip reissue)

[Cooper Sloan]

Can I piggy back a little request on this thread for the now missing AN app
notes? AN6818 I think?

On Mon, Apr 24, 2017 at 9:53 AM Justin Herrmann <ebn303afxcut at email.com>
wrote:

> Datasheets for CA3280, LM13700, and NE5517 all claim "excellent matching"
> between the pairs, but none back up that claim with numbers or guaranteed
> matching specs. On the other hand, the SSM2164 claims "All channels are
> closely matched to within 0.07 dB at unity gain."
>
> Has anyone compared how closely OTA devices within a package match? Is it
> just gm that's important here?
>
> Justin
>
> On 04/23/2017, 11:10 PM Michael E Caloroso <mec.forumreader at gmail.com>
> wrote:
>>
>> The CA3280 dual OTAs are also matched, which the 2164 cannot claim.
>> There is no dual matched OTA IC currently available on the market.
>>
>> MC
>>
>> On 4/23/17, David G Dixon <dixon at mail.ubc.ca> wrote:
>> > The exponential response of the 2164 is good enough for just about
>> anything
>> > you need it to do. It is the heart of the Dixie, Rubicon, and Atlantis
>> > VCOs, and we have sold about a million dollars worth of those, so it
>> can't
>> > suck all that hard.
>> >
>> >> -----Original Message-----
>> >> From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On
>> >> Behalf Of Ian Fritz
>> >> Sent: Sunday, April 23, 2017 2:14 PM
>> >> To: Tom Wiltshire; Jay Schwichtenberg
>> >> Cc: synth-diy at synth-diy.org
>> >> Subject: Re: [sdiy] SSM chip reissue
>> >>
>> >>
>> >>
>> >> The CA3280 is a much higher performance chip. For example, it
>> >> has a specially designed low noise input. The expo response
>> >> of the 2164 is pretty poor, compared with what one can do
>> >> with a good monolithic pair. Etc.
>> >>
>> >> Ian
>> >>
>> >>
>> >>
>> >> On 4/23/2017 12:52 PM, Tom Wiltshire wrote:
>> >> >
>> >> >
>> >> > Talking of which, why not use the 2164 instead of the
>> >> CA3280? You can
>> >> > use it for filters, VCAs, and VCOs, and it's got the exponential
>> >> > reposnse built in, unlike the CA3280.
>> >> --
>> >> ijfritz.byethost4.com
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