something about op amps and cascode internal circuits in german: http://www.ic-ts-histo.de/anim/lina/lina.htm#anf
On Sun, Mar 3, 2019 at 11:11 PM ludwig jaffe ludwig.jaffe@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@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@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@list.libresilicon.com http://list.libresilicon.com/mailman/listinfo/libre-silicon-devel