Inzaghi
Newbie level 4
This decision circuit is mentioned in Allen’s book . It is firstly presented in M.bazes’s paper: Two novel fully complementary self-biased CMOS differential amplifiers.
In this paper: “Circuit simulations showed that the addition of filter capacitors
to the sources of device pairs M1A-B, and M2A-B enhanced the switching speed of the CSDA in this particular application. This speed enhancement is the result of the additional charge supplied by the capacitors during switching transients .”
I tried this method, but no improvement on switching speed. why?
now a stage csda consume 20uA current. If I reduce w/l of M3 and m4, quiescent bias current decrease,but at the same time switching speed also decrease.
If any modification on this circuit with lower current (without increaseing delay of the decision circuit) , thanks!
https://obrazki.elektroda.pl/92_1172820104.JPG
In this paper: “Circuit simulations showed that the addition of filter capacitors
to the sources of device pairs M1A-B, and M2A-B enhanced the switching speed of the CSDA in this particular application. This speed enhancement is the result of the additional charge supplied by the capacitors during switching transients .”
I tried this method, but no improvement on switching speed. why?
now a stage csda consume 20uA current. If I reduce w/l of M3 and m4, quiescent bias current decrease,but at the same time switching speed also decrease.
If any modification on this circuit with lower current (without increaseing delay of the decision circuit) , thanks!
https://obrazki.elektroda.pl/92_1172820104.JPG