{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

EE 435 Lect 34 Spring 2010

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

Info icon This preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
EE 435 Lecture 34 DAC Design string DACs
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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 .• • •
Image of page 2
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 .• • •
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
R-String DAC .• Review from last lecture .• • •
Image of page 4