hhq414
Member level 1
noise models in time-domain for pll
Hi,all.
I followed the method of kundert and constructed a pll time domain model to simulate the total phase noise.The model can work correctly,but when I extended it to sigma-delta fractional pll,the output phase noise seems unreasonable.The sigma-delta modulator is a MASH1-1-1 one.I wanted to see the output phase noise only from sigma-delta modulator.When the input fractional part is .0,the output phase noise picture is as follow:
Hi,all.
I followed the method of kundert and constructed a pll time domain model to simulate the total phase noise.The model can work correctly,but when I extended it to sigma-delta fractional pll,the output phase noise seems unreasonable.The sigma-delta modulator is a MASH1-1-1 one.I wanted to see the output phase noise only from sigma-delta modulator.When the input fractional part is .0,the output phase noise picture is as follow: