[sdiy] OTA performance (was SSM chip reissue)

[Josh Nursing]

First Doc here?
http://www.intersil.com/en/products/amplifiers-and-buffers/all-amplifiers/amplifiers/CA3280.html#documents

Question: Is it possible to do a pole-mixing filter with LM13700s?

Josh

On Mon, Apr 24, 2017 at 3:52 PM, Cooper Sloan <mistercooper at gmail.com>
wrote:

> It's one of the 3 or 4 3280/3080 app notes put out by intersil/Harris, but
> only two are live on their site now.
>
> On Mon, Apr 24, 2017 at 12:51 PM MTG <grant at musictechnologiesgroup.com>
> wrote:
>
>> Sorry I don't know this one. Which manufacturer for AN6818?
>>
>>
>>
>> On 4/24/2017 11:41 AM, Cooper Sloan wrote:
>>
>> 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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