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Subject: resistor string dac

Date: 10/04/03 at 12:30 PM
Posted by: jason
E-mail: jason_class[AT55]yahoo.com (replace [AT55] with @ to reply)
Message Posted:

Hi Russ and Mike

I need your help on DAC too this time.
In the page
http://www.geocities.com/jason_class/RstringDAC.gif

I do not know what does it mean in statement 1.
For statement 2, how do we know it work close to V supply positive.
may I know what is transmisssion gate? Is it mosfet work in triode region or resistor or??

May I know what a buffer is meant for and roughly how it works? Why the negative temrnial of opamp is connect to out put without resistor rf? Any reason?

Can explain roughly for case digital input 101 for how it runs in the circuit.
Thank you

rgds
Jason

May I know is ir true the transistor that connect to the positive input of opamp is working in saturation region while the remaining are in triode region(as resistor)?
Kindly let me know how it works if I am wrong.
Then can roughly explain when B1 high, which word line will be high? Kindly explain 0110 situation or any other digital input as I really need your help to understand how it works.
Thank you

rgds
Jason


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