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  1. #1
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    Problem in Designing of SAR ADC

    Hi team
    I am designing SAR adc . I am finding trouble in designing switches in dac charge redistribution circuit.I am using cadence virtuoso and I know that I can use the direct SPDT switch from analog lib,but I want to design it by using mosfets. Can anyone help me in this task?
    I am designing 4 bit SAR adc.I am attaching circuit over here for more clearance.
    Thank youClick image for larger version. 

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  2. #2
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    Re: Problem in Designing of SAR ADC

    How about something like this? Depending on your input range you may not need a transmission gate.

    Click image for larger version. 

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  3. #3
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    Re: Problem in Designing of SAR ADC

    I guess the library SPDT switches are CMOS switches with respective drivers. If you want similar performance, there's no more simple circuit alternative.

    If you want to avoid library usage, sketch circuit yourself.


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  4. #4
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    Re: Problem in Designing of SAR ADC

    Quote Originally Posted by FvM View Post
    I guess the library SPDT switches are CMOS switches with respective drivers. If you want similar performance, there's no more simple circuit alternative.

    If you want to avoid library usage, sketch circuit yourself.
    analogLib components are ideal


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