prcken
Advanced Member level 1
i want to ask a question, i think it's simple but couldn't quite figure out a reason by myslef.
in DDR SDRAM we want to generate Vref as a referenece for 16 input comparators, the nominal value is half the power supply.
i think just use resistor divider is enough for this case, what's benfit to add a buffer stage (unity-gain opamp)? please check the picture.
i don't think there is a speed or loading effects for this case.
any comments?
thanks
in DDR SDRAM we want to generate Vref as a referenece for 16 input comparators, the nominal value is half the power supply.
i think just use resistor divider is enough for this case, what's benfit to add a buffer stage (unity-gain opamp)? please check the picture.
i don't think there is a speed or loading effects for this case.
any comments?
thanks