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Re: 50 cent DDS synthesizer

From Martin Brown <'''newspam'''@nonad.co.uk>
Newsgroups sci.electronics.design, comp.arch.fpga
Subject Re: 50 cent DDS synthesizer
Date 2025-10-23 19:33 +0100
Organization A noiseless patient Spider
Message-ID <10ddse6$214ej$1@dont-email.me> (permalink)
References <8fjifkteog2a8s8960dk7lak7kh70lrtta@4ax.com> <10dcmfd$1fcrk$1@dont-email.me> <jgekfklf9s7khf3kqf07a1jdcuegik14bi@4ax.com> <20251023a@crcomp.net> <10ddo5a$1v5hk$1@dont-email.me>

Cross-posted to 2 groups.

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On 23/10/2025 18:20, Jan Panteltje wrote:

>> Jan's cited tutorial says:
>>
>>     Compared to the R-2R DAC, the binary weighted digital-to-analogue
>>     converter has an analogue output voltage which is the weighted
>>     sum of the individual inputs. Thus it requires a large range of
>>     precision resistors within its ladder network, making its design
>>     both expensive and impractical for most DAC's requiring lower
>>     levels of resolution.
>>     
>> Discussions in this group left me with the impression precision resistor
>> fabrication became trivial thanks to the trimming technology of modern
>> lasers? Is the price of precision resistors still a factor?
> 
> In the case of R2R you can use resistors from one batch and that may have less spreading in values
> No precision resistors needed.
> (2R is then 2 1R resistors in series).

And R/2 is two 1R in parallel.
You end up with the 1R being the least accurate.
It gets out of hand quickly if you want too many bits.

-- 
Martin Brown

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Thread

50 cent DDS synthesizer john larkin <jl@glen--canyon.com> - 2025-10-22 14:49 -0700
  Re: 50 cent DDS synthesizer Jan Panteltje <alien@comet.invalid> - 2025-10-23 07:45 +0000
    Re: 50 cent DDS synthesizer john larkin <jl@glen--canyon.com> - 2025-10-23 07:36 -0700
      Re: 50 cent DDS synthesizer Jan Panteltje <alien@comet.invalid> - 2025-10-23 15:16 +0000
      Re: 50 cent DDS synthesizer "Don" <g@crcomp.net> - 2025-10-23 16:54 +0000
        Re: 50 cent DDS synthesizer Jan Panteltje <alien@comet.invalid> - 2025-10-23 17:20 +0000
          Re: 50 cent DDS synthesizer Martin Brown <'''newspam'''@nonad.co.uk> - 2025-10-23 19:33 +0100
          Re: 50 cent DDS synthesizer Chris Jones <lugnut808@spam.yahoo.com> - 2025-10-24 10:12 +1100
            Re: 50 cent DDS synthesizer Jan Panteltje <alien@comet.invalid> - 2025-10-24 06:56 +0000
              Re: 50 cent DDS synthesizer Martin Brown <'''newspam'''@nonad.co.uk> - 2025-10-24 09:53 +0100
              Re: 50 cent DDS synthesizer Lasse Langwadt <llc@fonz.dk> - 2025-10-24 13:40 +0200
                Re: 50 cent DDS synthesizer john larkin <jl@glen--canyon.com> - 2025-10-24 07:09 -0700
                Re: 50 cent DDS synthesizer Jan Panteltje <alien@comet.invalid> - 2025-10-24 17:17 +0000
              Re: 50 cent DDS synthesizer antispam@fricas.org (Waldek Hebisch) - 2025-10-25 22:00 +0000
                Re: 50 cent DDS synthesizer Jan Panteltje <alien@comet.invalid> - 2025-10-26 08:10 +0000
                Re: 50 cent DDS synthesizer john larkin <jl@glen--canyon.com> - 2025-10-26 07:56 -0700
                Re: 50 cent DDS synthesizer Bill Sloman <bill.sloman@ieee.org> - 2025-10-27 03:19 +1100
                Re: 50 cent DDS synthesizer john larkin <jl@glen--canyon.com> - 2025-10-26 10:08 -0700
                Re: 50 cent DDS synthesizer Bill Sloman <bill.sloman@ieee.org> - 2025-10-27 16:02 +1100
                Re: 50 cent DDS synthesizer antispam@fricas.org (Waldek Hebisch) - 2025-10-27 00:10 +0000
                Re: 50 cent DDS synthesizer Jan Panteltje <alien@comet.invalid> - 2025-10-27 09:52 +0000
                Re: 50 cent DDS synthesizer antispam@fricas.org (Waldek Hebisch) - 2025-10-28 16:31 +0000
                Re: 50 cent DDS synthesizer Jan Panteltje <alien@comet.invalid> - 2025-10-28 17:41 +0000
                Re: 50 cent DDS synthesizer john larkin <jl@glen--canyon.com> - 2025-10-27 07:58 -0700
        Re: 50 cent DDS synthesizer john larkin <jl@glen--canyon.com> - 2025-10-23 11:46 -0700
          Re: 50 cent DDS synthesizer john larkin <jl@glen--canyon.com> - 2025-10-23 18:55 -0700
            Re: 50 cent DDS synthesizer Jan Panteltje <alien@comet.invalid> - 2025-10-24 06:57 +0000
              Re: 50 cent DDS synthesizer Jan Panteltje <alien@comet.invalid> - 2025-10-24 07:38 +0000

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