self bias comparator design

[alok_ky]

self-biased comparator

I need to design a simple comparator to be used in low voltage detection circuit.

The power supply minimum value is 1.6V.

When I use the normal comparator ( diff input, single-ended opamp with current mirror load), the cicuit suffers from the voltage headroom and the input transisitors of the opamp do not get proper 'vds' (due to current diode as load)

So, plz let me know how how to solve this problem. Simple circuits plz...

I heard of a comparator , known as self- biased comparator.

Anybody knows more abt that ??? ...any reference doc for that ????

 

[dwilliam]

how to bias a comparator

Check the book "CMOS circuit design, layout, and simulation" by R. Jacob on page 691