bias circuitry for DAC

[togopakumar]

dac bias

hi all

I am doing 8 bit DAC and going with the thermometer architecture. can anyone suggest me,how to design the bias circuitry to bias the current sources. it will a great help for me.

 

[nassim_el85]

hi

You can use simply a cascode current mirror, if you probably have cascode current source architecture, and a gain boosting architecture to transfer the voltage bias into current one.

 

[togopakumar]

hi nassim_el85

thank you.can u tell me from which book or site which i can download the required cascode current source architecture and gain boosting architecture.

 

[nassim_el85]

hi

Dr Razavi's book on Design of Analog CMOS circuits have an interesting chapter on bandgap and also current mirrors.

 

[Gundam001]

Try this link, this could be a good article for you..

http://www.edn.com/index.asp?layout=article&articleid=CA6339252&spacedesc=designideas&industryid=44217