sethtalk
Member level 3
hi,
I have a question about stability criterior in negative feedback circuit,
i hope somebody who have read "Understanding delta-sigma converter",Temes,G.C.
can tell me the answer..
In circuit theory, we know in a nagative feedback system,the loop gain L1(f) is
stable if |L1(f)|<1 at 180 degree phase shit location,say f=f1,
my question is:
in section 4.2.1,fig4.7 (bode plot for the 5'th order loop filter).in the paragraph
the author said ".... Kmin=1/1.83 = 0.547,is the lowest allowable quantizer gain
as indicated in Fig4.6",it seem contradict to my belief,I thought 0.547 should be
the maximum value,not minimum value,because |L1|>1 at f1 location for every value
k >= 0.547..
could everybody can tell me what mistake i made??
I have a question about stability criterior in negative feedback circuit,
i hope somebody who have read "Understanding delta-sigma converter",Temes,G.C.
can tell me the answer..
In circuit theory, we know in a nagative feedback system,the loop gain L1(f) is
stable if |L1(f)|<1 at 180 degree phase shit location,say f=f1,
my question is:
in section 4.2.1,fig4.7 (bode plot for the 5'th order loop filter).in the paragraph
the author said ".... Kmin=1/1.83 = 0.547,is the lowest allowable quantizer gain
as indicated in Fig4.6",it seem contradict to my belief,I thought 0.547 should be
the maximum value,not minimum value,because |L1|>1 at f1 location for every value
k >= 0.547..
could everybody can tell me what mistake i made??
