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How to choose a resistor mismatch value for a DAC?

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ken_cn

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resistor mismatch

Dear all,
Who can tell me how to choose the mismatch value of the res to design the 7bit DAC with 128 res in series?
I know that a larger size makes a smaller mismatch, but I don't kown what mismatch value can meet my spec.
Could you show me some paper about this? Thanks!

B.R.
 

resistor +mismatch

The foundry always serve some paper for the PCM or spice model of the resistor, which contains the mismatch VS the W L of the resistor. you can look for it.
 

how to choose a resistor

ken_cn said:
I don't kown what mismatch value can meet my spec.
Click to expand...
The mismatch should be lower than your resolution, say < 1/2 LSB. So for a 7bit DAC less than 0.5*2^-7 ≈ 0.25% .
 

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