Measurement of Bandgap current Reference

[remind1104]

bandgap current measurement

I designed BGR for current reference...

And I biasing High speed Comparator( fin = 50Mhz)

After Simulating, I measured current that BGR output.. (see the attached picture )

I questioned why current resonated???

I think voltage reference generate constant reference... Also current reference...

I measured this result in transient analysis, because the comparator operate in

frequency domain.... Is this some factor about resonating?

Give me some comments aoubt this phenomenon.... thk....

 

[pixel]

System is unstable.
You have strong positive feedback loop: inn out M0.

 

[remind1104]

thk for reply...
And, Do you have any solution about this unstable
state?
Give me some advice... plz

 

[pixel]

You have both positive and negative feedbacks. It can be stable if you can make that negatibve feedback is much stronger than positive... Capacitor in negative feefback path to make it dominant?
Do you really have to use this configuration?