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https://designers-guide.org/forum/YaBB.pl Design >> Analog Design >> cheap programmable divider https://designers-guide.org/forum/YaBB.pl?num=1206717344 Message started by vivkr on Mar 28th, 2008, 8:15am |
Title: cheap programmable divider Post by vivkr on Mar 28th, 2008, 8:15am Hi, I was wondering if there was a good way to make a cheap programmable resistive divider, say 6-8 bit? Thanks Vivek |
Title: Re: cheap programmable divider Post by thechopper on Mar 30th, 2008, 3:01pm Hi Vivek, I think the trade off between achieving such resolution and making a cheap resistor divider is (and I'm sure you know it) the R-2R ladder structure. You would need 2^N taps (N= number of bits) and your divider would only have unit cells of size R. Making a straightforward resistor divider by using equally sized resistor for each tap would require much more parallel/series combination for such resolution than the ones you need for the R-2R structure. Hope this helps Tosei. |
Title: Re: cheap programmable divider Post by vivkr on Mar 31st, 2008, 11:08pm Hi Tosei, Thanks for your reply. Indeed, the basic tradeoff is clear. I need to see if I can use an R-2R ladder. I think this will be a problem for me because I need to keep the overall ladder resistance more or less constant (not too much variation). Perhaps I can try some variation on this one. Vivek |
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