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Regarding Output impedance in unit element of DAC

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ammu1

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Hi,
Iam design a unit element using switches and cascade transistors now am getting the output impedance at 1GHz frequency 108dB and SFDR 65dB .

Iam attaching my design .



How to improve output impedance in DAC in 65nm design at higher frequencies .using inductors or inverters or anyother method is there.

Any suggestions ?

Thanks
 

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