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ontheverge Junior Member Offline Posts: 31	on 0.13um tech. Oct 05^th, 2010, 4:50pm Hi, I was designing an folded cascode op-amp in 0.13um technology, the single stage gain requirement dictates that channel length to be larger than 0.35um (with specific circuit architecture), if the way i designed it was right, does that mean the technology was wasted? thanks, Steve
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AnalogDE Senior Member Offline Posts: 137	Re: on 0.13um tech. Reply #1 - Oct 6^th, 2010, 9:00am I'd recommend sizing the cascodes using minimum channel length.
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raja.cedt Senior Fellow Offline Posts: 1516 Germany	Re: on 0.13um tech. Reply #2 - Oct 6^th, 2010, 7:09pm hi steve, what do you mean by wasted, mainly these process nodes are highly digitally biased..so you don't get good gds, in fact there are people who design analog design circuits with 1u channel length also. so what i my suggestion is try to use min-length devices wherever possible like cascode devices. Thanks.
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ywguo

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Posts: 943
Shanghai, PRC

Re: on 0.13um tech.
Reply #3 - Oct 6^th, 2010, 7:47pm

Hi Steve,

There must be more specs than the DC gain. So your choice of the channel length is a compromise of all specifications. Does the current channel length result in a good balance between power, speed, gain, area, mismatch, noise, and so on? If the answer is YES, it's fine. Anyway, the deep sub-micron technology is optimized for digital design, not for analog.

Best Regards,
Yawei

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love_analog Senior Member Offline Posts: 101	Re: on 0.13um tech. Reply #4 - Oct 11^th, 2010, 6:10am This is not wasted. What it means is that you are using a larger Length device to get higher Rout.
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Lex Senior Member Offline Posts: 201 Eindhoven, Holland	Re: on 0.13um tech. Reply #5 - Oct 13^th, 2010, 7:54am If you are using the 3.3V devices, a gate length of 0.35 um is quite minimal.
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