How to design the channel length of transistors in this SA?

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slchen

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sense amplifier design

Deal all:

I am designing a sense amplifier for a SRAM.
however, how to design the channel length of the transistors in this SA?
Can I use the minimun channel length?

Thanks a lot.

slchen
 

Re: sense amplifier design

I am not familiar with sense amplifier but I guess you should use the shortest L for highest speed ( as typical of digital circuits )
 

Re: sense amplifier design

sense amplifier do not need high gain, so high speed is the critical
 

Re: sense amplifier design

while there is a problem to consider is about the matching device, by using minimum channel length, once there is a process shift for delta L, you will get big offset easily, so when I am design the differential device or some other matching devices for the senseamp in a flash memory, I choose not to use the minimum size, instead, add 20% for safe.
 

Re: sense amplifier design


is this 20 % something like a rule to thumb or you are just adding it by yourself... just to know....
 

Re: sense amplifier design

You may use the lowest value of MOS channel length to minimize the Cgs to increase the speed of your sense amplifier.
I recommend you to read Jacob Baker "CMOS: Design, Layout and Simulation" 2-nd edition. There is a chapter or article about sense amps.
 

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