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Design >> Mixed-Signal Design >> Delta Sigma + Current steering DAC
https://designers-guide.org/forum/YaBB.pl?num=1207837069

Message started by caosl_zju on Apr 10^th, 2008, 7:17am

Title: Delta Sigma + Current steering DAC
Post by caosl_zju on Apr 10^th, 2008, 7:17am

Hi, all
In a delta sigma DAC, classical implementation is Digital interpolator -->Digital DSM -->Switch Cap dac & Filter --> active filter . Now, i want to replace the Switch Cap dac with current steering dac to save area and power consumption. The question is coming, how to resolve the jiter problem? The dac level is just 9.
All comments are welcome.

Title: Re: Delta Sigma + Current steering DAC
Post by ywguo on Apr 11^th, 2008, 9:47pm

Hi,

I think the jitter is a common problem for the delta-sigma DAC with switch-cap dac & filter and the delta-sigma DAC with current-steering DAC. Right?

Yawei

Title: Re: Delta Sigma + Current steering DAC
Post by caosl_zju on Apr 13^th, 2008, 12:25am

hi,Yawei
Thanks for your reply. Switch cap implementation is a discrete time style, the final settled value is of most concern. But in a current steering DAC circuit, the full time value must be cared, the jitter will introduce the error in transform process, just in a Continuous time Sigma Delta ADC which is a hot topic in mixed signal ic design nowadays, if the feedback dac is a current steering form, the jitter will normally restrict the whole system performance. Expect more discussion.
san.