comparator threshold voltage shift problem

[liletian]

comparator threshold voltage

Hi Guys
FOr most of the comparators, people use different amplifier structure, but there always a threshold voltage shift problem for two transistors? Are there some research about it? Is there a good way to solve it?
Thanks a lot

 

[liuyonggen_1]

what is the threshold voltage of the comparator

What the threshold voltage shift?

 

[iamxo]

comparator hysteresis threshold voltage shift

Do you mean the mismatch of the input transistors?

If so, there are papers talking about it in ieee.

 

[ashish_chauhan]

threshold voltage shift packaging stress

If you are talking about some kind of drift issue coming up with time ... then adding antenna diodes on the comparator inputs will help in this case.

 

[iamxo]

comparator threshold voltage calculate

If you are talking about some kind of drift issue coming up with time ... then adding antenna diodes on the comparator inputs will help in this case.

Really? I have never heard of this before, could you pls explain clearly?
I only know the effect of antenna diodes is to prevent from suffuring "antenna effect".

 

[Fom]

some shift can be induced by package stress.

 

[jerryzhao]

threshold voltage shift and hysteresis. Detail see the us patent5235333, 5675340, 5006853.
And the paper, T.L.Tewksbury "Characterization, Modeling, and Miniminzation of Transient Threshold Voltage Shift in MOSFET's" IEEE Jssc, MAR. 1994 .
T.L.Tewksbury "The Effects of Oxide Traps on the Large-Signal Transient Response of Analog MOS Circuits" Apr. 1989.IEEE JSSC.

Added after 5 minutes:

But if your ADC less than 10bit , you don't care the threshold voltage shift effect. This effect like 1/f noise. use the Pmos as input MOS can reduce this effect.

Added after 6 minutes:

limited the input voltage can reduce this effect also, and I have applied to patent this method.