My main question is - how is CT from table (which is sum of C13 and C18) sized ?
In the picture it says that CT is the sum of C13 and other capacitances. But i find it odd that a1=C13/CT=2.25, since C13 should be smaller than CT.
I read in Maloberti's Data Converter text, that designing a single bit DAC, higher order (say order 5 as the example in Schreier Temes is) in something below 0.18um CMOS is not advisable to low signal swing at the opamps outputs which can cause stability issues for the converter.
Do you have any thoughts about this ?
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