[Libre-silicon-devel] ADC for Northpoint diff.pair and delta sigma modulator

ludwig jaffe ludwig.jaffe at gmail.com
Tue Feb 26 04:16:31 CET 2019

There is a trick to get an adc from a differential pair input (lvds) by
connecting the single ended output of a gpo to a resistor and having a
capacitor at the other end of the resistor connected to gnd on its other
side while the connection of r.and c is fed to one input of the lvds pair
and the other input senses the voltage and is the adc input.
The gpo is controlled by a delta sigma modulator.
The rc generates a comparision voltage for the lvds to flip high or low
depending on the change of the input voltage.
It is like balancing a broom in your hand.😃



See attaced file by lattice and here


Tuesday, February 26, 2019, Ludwig Jaffe <ludwig.jaffe at gmail.com> wrote:
> Hi David,
> what memory tech can we do?
> DDR?
> What about driving FB-DIMM (ddr2) with their own controller in the dimm,
extendable, based on a special bus used in fbdimm only.
> The tech was brought up by intel and has afik not too much lines.
> Advantage memory modules from old servers are cheap especially 1 and 2 gb
> There is spec from intel about fbdimm.
> Cheers
> Ludwig
> On February 25, 2019 5:45:22 PM GMT+01:00, "David Lanzendörfer" <
david.lanzendoerfer at o2s.ch> wrote:
>> Hi
>>> 130nm is the point at which DDR3 can reach 400mhz. that's actually
>> We're working on one micron right now...
>> Yes! Of course! As soon as we've going submicron, DDR3 becomes a topic.
>> Especially because we need DRAM for our SoCs and CPUs
>> Cheers
>> David
> --
> Sent from my Android device with K-9 Mail. Please excuse my brevity.

Send from mobile phone with autocorrection / autofill. Blame my phone for
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