[Libre-silicon-devel] Analog Try-out "triple-5"

ludwig jaffe ludwig.jaffe at gmail.com
Mon Mar 4 05:13:54 CET 2019

something about op amps and cascode internal circuits in german:

On Sun, Mar 3, 2019 at 11:11 PM ludwig jaffe <ludwig.jaffe at gmail.com> wrote:

> TAA761 and other historic classic chips in german
> http://www.ic-ts-histo.de/fad/ics/taa761/taa761fa.htm
> On Sun, Mar 3, 2019 at 11:10 PM ludwig jaffe <ludwig.jaffe at gmail.com>
> wrote:
>> Hi Hagen,
>> we could make a combo chip:
>> NE555, some LM741, and some CD4066 (transfer gate)
>> UC3845, UC3843 (simple PWM chip for switch mode power supply)
>> So geeks could combine the chips using transfer gates :-)
>> Or lets think about a simple analog geeky chip, that contains:
>> saw tooth generator, comparator, rs latch, error-amps (UC3845)
>> while the the saw tooth generator is replaced with a NE555 (transfer gate,
>> or just fitting the ne 555 instead of the internal uc3845 saw tooth
>> generator)
>> The Op-Amp in the UC3845 may be replaced with a 741 or similar simple op
>> amp.
>> So we have an universal circuit containing:
>> -OPAMPS (741, LM324 or similar)
>> -universal SAWTOOTH-Generators (NE555)
>> -RS-Latch (NE555 also has a latch) for use in fake UC3845
>> -the rest used in UC3845
>> the transfer gates are used as pin mux so we can access internal stuff
>> of the modified UC3845 and split it into, OP-AMPS, NE555 and so on.
>> So having a programable simple analog circuit would be cool.
>> Also a TL431 programable z-diode woud be cool as well as
>> TAA 761 open collector op-amp.
>> So here we could combine TL431 with TAA761 open collector
>> op amp.
>> We would have an analog "fpga"
>> What do you think?
>> Cheers,
>> Ludwig
>> On Sun, Mar 3, 2019 at 2:13 PM Hagen SANKOWSKI <hsank at posteo.de> wrote:
>>> Hello List.
>>> Today in our weekly Mumble Session we talked about a smaller chip, which
>>> could be realized before the Northpoint.
>>> The Reason is mostly, that the Northpoint (as an small MCU) - beside the
>>> Standard Cells - also has some challenging Analog Stuff (like the ADC,
>>> Pad-Cells) which set the hurdle a little bit high.
>>> We need some physical haptic fancy / shiny silicon before which gives us
>>> also a realistic way to verify our simulation after model measurement we
>>> do with PearlRiver. Something we could hand over to other people and
>>> which blinks..
>>> Well, we came across the well-known "triple-5 chip". The original NE555
>>> [0] was developed by the Swiss electronics engineer Hans Camenzind [1]
>>> and get cloned by nearly all silicon firms on the market in this era.
>>> Great starting points for our CMOS-based clone are the wikipedia site
>>> and the free eBook [2] of the original author. I strongly recommend
>>> everybody to read this great book!
>>> Mostly the 555 chips are in the -55 to +125 C temperature range - the
>>> same we assume for our technology. And the voltage supply goes up to +18
>>> Volt, I already saw 555 which worked with higher voltage. If we like, we
>>> could using our BiCMOS feature for the output driver - driving the same
>>> current with less power consumption.
>>> The 555 chip has a legendary status between electronic engineers, radio
>>> amateurs and tinkers. And some of them writing obeisance on hackaday.com
>>> still in 2018 [3]. Many variations of the chip are still in production.
>>> Short - the 555 would be a great try-out for LibreSilicon! And I am
>>> proud to announce that Ferenc will be our Lead for the "LS 555"
>>> (LibreSilicon triple-5). Thanks Ferenc for your commitment!
>>> Regards,
>>> Hagen.
>>> [0] https://en.wikipedia.org/wiki/555_timer_IC
>>> [1] https://en.wikipedia.org/wiki/Hans_Camenzind
>>> [2] http://www.designinganalogchips.com/
>>> [3] https://hackaday.com/2018/10/10/the-555-and-how-it-got-that-way/
>>> _______________________________________________
>>> Libre-silicon-devel mailing list
>>> Libre-silicon-devel at list.libresilicon.com
>>> http://list.libresilicon.com/mailman/listinfo/libre-silicon-devel
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