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i need switchable buffer

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amr hema

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hi every one

i am designing sar adc 26 Mhz and design input buffer as two stage ota with folded cascode as a core
i wanna make my buffer switchable which work in the sampling phase and be off the rest of the clock to save power

how can i make it ?
can i switch on vdd i.e connect vdd in sampling and disconnect in the rest clock

thx in advance
 

can i switch on vdd i.e connect vdd in sampling and disconnect in the rest clock

No. Better use logical enable/disable signals to prohibit all bias currents and short circuit all bias voltages.
 

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