Strategies for temperature-compensating differential pairs

May 09, 2010 24 Replies

I've actually built a few circuits around the SSM2044 VCF - I bought several off Ebay years ago before I understood how large the industry of IC fakes is. The ones I've used appear to function as intended within the bounds of what tests I'm able to perform, so who knows, maybe they're _good_ fakes? :)

Thanks for the encouragement - I do some microcontroller programming too but it's the analog aspect of circuit design that really gets my mind going.

OTA-based sine-wave oscillator?

Or would square wave suffice? ...Jim Thompson

| James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | The only thing bipartisan in this country is hypocrisy

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Derek Bowers was the guy behind SSM. You can probably find papers from him. Doug Curtis wasn't quite as interested in publishing. Doug has a nice set up. I recall being greeted by a coyote the first time I went to his lair. At the time he had the company run out of his guest house in Los Gatos.

What about John Burgoon(sp?) of Solid State Music 2102A (Kifer?) in Santa Clara CA? I understand that he developed those circuits and with some horsetrading got Exar to make chips for him...resulting in some rather nice analog chips useful for sound and music generation.

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When I was at Exar, my understanding is Bowers did the designs. SSM was buying analog gate arrays from Exar. I did not have first hand knowledge of this since I worked in a different group.

I thought SSM was folded into ADI. You find SSM datasheets on the ADI website:

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If you look at Exar today, they don't have the bipolar product line to make the SSM style chips (unless they don't put it on the website). Back in the day, Exar was getting their bipolar from Rohm in some bizarre deal that never made sense to me (well at least from Rohm's end). The two companies have been disconnected for years.

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