+ Post New Thread
Results 1 to 4 of 4

28th August 2008, 14:35 #1
 Join Date
 Aug 2006
 Posts
 42
 Helped
 6 / 6
 Points
 1,901
 Level
 10
r2r calculate

28th August 2008, 14:35

3rd September 2008, 16:03 #2
 Join Date
 Jan 2005
 Posts
 100
 Helped
 7 / 7
 Points
 2,082
 Level
 10
r/2r dac equation
could you reupload a more clear pic?
in generally, the r2r calculate is easy, please from the terminal close the vref,then one by one to the termal close the opamp.

3rd September 2008, 16:03

3rd September 2008, 18:05 #3
caclulation of a R2R dac ladder
Google it. :)

3rd September 2008, 18:05

5th March 2010, 23:09 #4
 Join Date
 Jun 2008
 Location
 Hungary
 Posts
 42
 Helped
 3 / 3
 Points
 1,874
 Level
 10
Re: caclulation of a R2R dac ladder
I do not understand the analysis of the R2R ladders. My main concern is that the different bits are seeing different resistances. If we look downwards all the resistances are 2R, but not upwards! For example the weight of b(n2) should be (R+2R)2R/((R+2R)2R+2R)=3/8
For a 2 bit DAC the outputs would be:
0, 3/8, 4/8, 7/8
So looking upwards from the right end of a 2R resistor we see a resistance which depends on the distance of the output node. Thus the bits are not binary weighted.
Could somebody resolve this?
Added after 2 hours 20 minutes:
Originally Posted by tzg6sa
+ Post New Thread
Please login