EE 435 Lect 34 Spring 2010

EE 435 Lect 34 Spring 2010 - EE 435 Lecture 34 DAC Design...

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EE 435 Lecture 34 DAC Design string DACs
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R-String DAC R S 1 R S 2 R S N-2 R S N-1 R S N RFF OUT n IN Basic R-String DAC .• • • Review from last lecture .•
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R-String DAC R-String DAC with MOS switches Switch impedance is not 0 Switch may not even turn on at all if V REF is large Switch impedance is input-code dependent Time constants are input-code dependent Transition times are previous-code dependent C L has 2 n diffusion capacitances so can get very large Mismatch of resistors local random variation gradient effects Decoder can get very large for n large Routing of the 2n switch signals can become very long and consume lots of area Possible Limitations: .• • • Review from last lecture .•
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R-String DAC .• • • Review from last lecture .•
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R-String DAC R R R R RFF n 1 IN S 1 S 2 S 3 R F S N2 n 2 n 12 n = n :n S ck S ck S c1 R S c1 S c2 S c2 S c3 S c3 S cN1 S cN1 R F R F R F R F S N2-1 OUT .• • • Review from last lecture .•
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R-String DAC 12 n = n :n Sometimes termed sub-divider, sub-range or dual-string DAC .• • • Review from last lecture .•
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R-String DAC 12 n = n :n .• • • Review from last lecture .•
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This note was uploaded on 01/31/2012 for the course EE 345 taught by Professor Geiger during the Fall '11 term at Iowa State.

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EE 435 Lect 34 Spring 2010 - EE 435 Lecture 34 DAC Design...

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