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Two-Stage Open-Loop Comparator in Allen�s Book (Read 3880 times)

qiushidaren

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Two-Stage Open-Loop Comparator in Allen�s Book
Jul 12^th, 2007, 8:40pm

Hi all,

Table 8.2-2 of Allen�s book <<CMOS Analog Circuit Design>> gives us a procedure to design a two-stage open-loop comparator for a linear response, in step 3, there is a equation I5=I7(2CI/CII), but I really don�t know how and from where can I derive it, your suggestions and time will be highly appreciated.

Rgds,
Terry

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skythunder New Member Offline Posts: 9	Re: Two-Stage Open-Loop Comparator in Allen�s Book Reply #1 - Jul 18^th, 2007, 12:26am I think I got it . P1=P2; P1=(gds2+gds4)/C1=2aId2/C1=Id5a/C1;P2=(gds6+gds7)/C2=2aId7/C2 (a means the parameter LAMDA) then you can get the I5=I72*C1/C2 regards
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qiushidaren Community Member Offline I am a lovely MOSFET! Posts: 86 Chengdu	Re: Two-Stage Open-Loop Comparator in Allen�s Book Reply #2 - Jul 18^th, 2007, 7:40pm Yes you are right, thank you so much. -Terry
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skythunder

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Re: Two-Stage Open-Loop Comparator in Allen�s Book
Reply #3 - Jul 18^th, 2007, 8:25pm

Hi, qiushidaren,

since we are both reading allen's book, the only difference is that you are focusing on the comparator, while I am working on the switched capacitor circuits. Can you give me some comments on my post just below your post, about the high Q SC biquad question ? I have been troubled by the circuit for a long time. Here is the link to my psot

http://www.designers-guide.org/Forum/YaBB.pl?num=1184741812

Thank you !

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