How Do You Calculate Resistor Values in a Digital to Analog Converter?

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In Digital to Analog converters, resistor values are crucial for proper function, particularly the weighted resistors (R, 2R, 3R, 4R) and the feedback resistor (Rf). It's important to avoid using excessively large base resistance values, as they can limit maximum output frequency due to stray capacitance. Conversely, using too small a base resistance can lead to excessive drive power requirements. The optimal base resistance should be slightly below the threshold that would negatively impact output bandwidth. Proper calculation and selection of these resistor values are essential for effective DAC performance.
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Hello Everyone,

In Digital to Analog conversion circuit we use the weighted resistors(i.e R,2R,3R,4R) and one feedback resistor(i.e Rf). Here my question is that how to calculate the those resistor values? If you know any formulas please provide me...
 
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uhdam said:
Hello Everyone,

In Digital to Analog conversion circuit we use the weighted resistors(i.e R,2R,3R,4R) and one feedback resistor(i.e Rf). Here my question is that how to calculate the those resistor values? If you know any formulas please provide me...

You don't want to use too large of a base resistance value, or you will limit your maximum output frequency too much (because of the stray capacitance in your DAC output layout).

You don't want to use too small of a base resistance, because that will take too much drive power.

The base resistance value that you choose should be just a bit smaller than what it takes to start limiting your output bandwidth lower than you want.
 
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