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Problem with the output of the switch

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Prem Arjun

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Hello everyone
I am trying to design a charge scaling DAC.
I am having problem with the output switch(transmission gate). When simulated individually it works fine. But when integrated into the DAC the output at the end of the switch remains floating at 1.8V(net9,net16,net11,net12). I couldn't understand the reason. Could someone help me out.
Thank you.
Please find the attachments.
 

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  • 4 bit dac output.png
    4 bit dac output.png
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  • switch.png
    switch.png
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  • 4 bit dac_edited.png
    4 bit dac_edited.png
    26.1 KB · Views: 127

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