Quantizer R/2R resistor ladder question

lexvortex · Joined: May 14, 2008 Posts: 155 Location: Toronto

Hi,

I'm going to be building two quantizers soon and I want to get 0.1% resistors for the R/2R part for better accuracy. Because they are so expensive I want to get only the ones I need but I don't really know what an R/2R resistor ladder looks like on a schematic. Which resistors should I make 0.1%?

Thank you,
Dave

ian-s · Posted: Mon Feb 15, 2010 2:32 am Post subject:

The ladder resistors are the 100K/200K ones to the right of the 4042 and 4013 ICs.

prgdeltablues · Posted: Mon Feb 15, 2010 5:05 am Post subject:

You might find it cheaper just to buy several times as many 1% resistors as you need, and hand sort them. I got 30 or so 100k's matched within 0.1% (99.9k to 100.1k) out of 200.

lexvortex · Joined: May 14, 2008 Posts: 155 Location: Toronto

Thank you

Cheers,
Dave