Sx_cut
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Dresden, Germany
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I want to discuss an issue I am facing while working on the design of DAC capacitive array. For simplicity I have reduced the array to 3 bits only. The capacitive array in SAR ADC has to be driven by a switch . When capacitve array is driven by ideal pulse sources, capacitors charge to the right voltages. But when, in Fig , i replace one of the pulse sources with transmission gate switch (with input as 2.8 ref voltage-I am keeping Vref the same as Vdd for now) the resultant net charge on the capacitive array gets distorted although the switch yeilds 2.8Vat the output but it fails to drive the capacitors. What can be done to make switch drive this capacitive array as eventually I have to drive each capacitor on the array with a switch. Thanks
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