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https://designers-guide.org/forum/YaBB.pl Design >> Analog Design >> Does the length of mos can exceed the upper limit in PDK? https://designers-guide.org/forum/YaBB.pl?num=1375976422 Message started by xianweng on Aug 8th, 2013, 8:40am |
Title: Does the length of mos can exceed the upper limit in PDK? Post by xianweng on Aug 8th, 2013, 8:40am Hi,all Does the length of mos can exceed the upper limit in PDK? For example,if the max length of mos is 10u in PDK.Does the length of mos can exceed it just as a capacitance for filter purpose ? Thanks any help in advance |
Title: Re: Does the length of mos can exceed the upper limit in PDK? Post by boe on Aug 9th, 2013, 1:35am Hi xianweng, what does the DRM say? - B O E |
Title: Re: Does the length of mos can exceed the upper limit in PDK? Post by xianweng on Aug 9th, 2013, 4:26am who is DRM |
Title: Re: Does the length of mos can exceed the upper limit in PDK? Post by Kevin Aylward on Aug 9th, 2013, 7:40am Usually the limit is set to those allowed by the Design Rules of the process. A waiver may be available at your own risk. For a capacitor, just use more devices in parallel. For use as a long mosfet, use several in series with their gates tied together. |
Title: Re: Does the length of mos can exceed the upper limit in PDK? Post by boe on Aug 9th, 2013, 12:12pm @xianweng: DRM = Design Rule Manual. @Kevin Aylward: Sound advice. - B O E |
Title: Re: Does the length of mos can exceed the upper limit in PDK? Post by xianweng on Aug 10th, 2013, 3:32am Kevin Aylward wrote on Aug 9th, 2013, 7:40am:
Kevin_Aylward ,thank you for your reply. We want to change technology of a chip that layout were already done .In that version ,some length of decouple capacitance (mos as capacitance)exceed the new pdk's limit. In design rule,it just say the min length of mos,but do not say the max,so I think i will be ok if L exceed the pdk limit just as capacitance |
Title: Re: Does the length of mos can exceed the upper limit in PDK? Post by xianweng on Aug 10th, 2013, 3:33am boe wrote on Aug 9th, 2013, 12:12pm:
B O E,thank you for your reply In design rule,it just say the min length of mos,but do not say the max,so I think i will be ok if L exceed the pdk limit just as capacitance |
Title: Re: Does the length of mos can exceed the upper limit in PDK? Post by avlsi on Aug 15th, 2013, 8:04am If you want higher Length permitted than PDK. Just stack the transistors!!! |
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