incomplete Σ Δ ADC -- since i don't quite grasp it's operation yet -- just to see where it goes . . .
the CLK not verified as opt. for this v. but for it's predecessor that was tracking the analog input with the analog summer - the D-Flop output was basically the same only it was without the U/D counter ...
the following shows the effect of resetting the U/D count to 0 after specific time interval (number of clocks)
-- the effect with pure*sine wave here is the "reset" (actually a periodic substraction of some constant) integrates the derivative of it* back to it* -- it's a lot of tedious testing to determine what to actually implement in circuit . . . but the following is showing the prev. test being on the right track
what is surprising here is that the lesser number of clocks gives better results ???
[Eop]
Sunday, February 19, 2017
DAC test
CD4069 outputs are referenced to supply median
checking if such produces a linear ramp . . .
all fun of resolving a simple 3 - supply voltage divider (finding the formula for UX)
. . . checking if such produces a linear ramp in excel . . .
-- the value 1/2 used in LT Spice seems to be incorrect . . .
[Eop]
checking if such produces a linear ramp . . .
all fun of resolving a simple 3 - supply voltage divider (finding the formula for UX)
. . . checking if such produces a linear ramp in excel . . .
-- the value 1/2 used in LT Spice seems to be incorrect . . .
[Eop]
Sunday, February 12, 2017
Absolute Voltage 2
the followup of the prev. post -- tested the experimental reference + came up with a new 1
the near zero error gives us the "absolute" voltage ref. -- tough -- there's no information about it's response to varying temperature !!!
[Eof]
the near zero error gives us the "absolute" voltage ref. -- tough -- there's no information about it's response to varying temperature !!!
[Eof]
Thursday, February 9, 2017
some experimental 1.2V supply designs + rnd. osc. variant
Originally designed for 3-5V operation , also studied for 1.2V
as with the 555 -- the basic operating mode's to generate low duty pulses -- economizing the battery
Hi precision supply -- preserving near ® precision and with added current limit
Simple not limited 1.2V linear voltage regulator
the Op Amp variant of the above " Hi precision supply" without current limiting
-- the design has a "new" type of adjustable voltage reference that has not especially been optimized nor tested for varying operating conditions !!! (i just needed one and simple here !fast (as in common))
+ some more : update 2017-02-13 (1-st time to break the ±1µV error !?)
[Eop]
as with the 555 -- the basic operating mode's to generate low duty pulses -- economizing the battery
Hi precision supply -- preserving near ® precision and with added current limit
Simple not limited 1.2V linear voltage regulator
the Op Amp variant of the above " Hi precision supply" without current limiting
-- the design has a "new" type of adjustable voltage reference that has not especially been optimized nor tested for varying operating conditions !!! (i just needed one and simple here !fast (as in common))
+ some more : update 2017-02-13 (1-st time to break the ±1µV error !?)
[Eop]















