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Thank you all very much. To VVV,I have read the specification of you linked, The noise of the output also be very big ,peak to peak voltage is about 200mV, do you know some IC chip could get a lower noise as 50mV(peak to peak)?
Our team design a chip which integrated two linear regulators and one DC/DC converter which controled by 270kHz PWM signal.But now we find if turn on the DC/DC converter with loading(about 300mA),big noise will be find in the linear regulator output.And in the market we haven't find similar...
After taped out,I found about 100M Hz noise apperaed at the PWM signal of my BUCK regulator .Ilet the PWM signal output pin to be floating,disconnected it with any external compnents,but It still be detected. I think maybe it is caused by the parasitic inductor and capacitor,or by the worse...
Now,I am designing a CMOS bandgap voltage reference in hspice. It's been asked to sweep temperature from 0 to 100 degree and the vdd changing from 3.3v to 5v.
I set:
.dc temp 0 100 0.1 vdd 3.3v 5v 1.7v
.tf v(vo) ??
.probe v(vo)
but I don't know what's the words I could put in the place of ...
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