[Moved] Comparator offset cancellation

[Majid_Vatan_Parast]

Hello everybody
I need to remove the offset of a comparator, but I have problem understanding the timing of offset cancellation and routine operation of the comparator.
Can anyone help me please
It is urgent
Please help me

 

[stenzer]

Hi,

is your problem related to an actual circuitry or a theoretical/assignment question?

Are you using an opamp or a dedicated comparator?
Single supply or dual supply?
IC part number?
Inverting or non-inverting?

BR

 

[danadakk]

Speed ?
Latency/delay ?
Noise (eg. use hysteresis) ?
Absolute accuracy you are seeking ?


Regards, Dana.

 

[KlausST]

Can anyone help me please
It is urgent
Please help me

Give useful informations, first.

What circuit, how and why?
What has "offset" to do with "timing"?

Give descriptions, links, pictures - even hand drawn....

Klaus

 

[dick_freebird]

Where / how you would "hide" the autozero depends on
the application externalities as well. A continuous-time
comparator with no clock resource would be tricky and
probably involve a pair of comparators plus switches
for the signal path, in addition to the zeroing "stuff". A
clocked comparator is easier, and there's a ton of
papers on CMOS comparators of that sort. Academia.edu
has a lot of that kind of thing.

 

[Majid_Vatan_Parast]

Hi,

is your problem related to an actual circuitry or a theoretical/assignment question?

Are you using an opamp or a dedicated comparator?
Single supply or dual supply?
IC part number?
Inverting or non-inverting?

BR

Hi
It is an actual circuitry, I am designing a 2b/c SAR ADC. It is a dynamic comparator with single supply. I want to implement a current mode offset cancellation circuitry.
Do I need to perform offset cancellation in every cycle ( every T ) or it is done only once?
When offset cancellation should start and when stop?
U can see structure of the comparator and Cks & Ck signal in the picture below.

--- Updated Sep 29, 2020 ---

Give useful informations, first.

What circuit, how and why?
What has "offset" to do with "timing"?

Give descriptions, links, pictures - even hand drawn....

Klaus

Hi
Offset cancellation circuit needs some control signals to work, I need to know the timing of these control signal in comparison with comparator and sampling clock.
And more important question, Do I need to perform offset cancellation in every cycle ( every T ) or it is done only once in entire ADC operation ?
By the way I am designing an asynchronous 2b/c SAR .

 

[KlausST]

Hi,

so you are doing "IC design" but posted in the "Analog Circuit Design" ... this explains the confusion.
I´ll move this thread to IC-Design section.

Klaus