how to simulate I/Q phase mismatch in divider?

[eejli]

divider simulate phase

say I have a divide by 2 divider and from transient simulation, I want to know whether there is 90 degree phase shift between the output I and Q signal. How to simulate it in cadence or ADS. Thank you very much.

 

[renwl]

i/q mismatch of divider

you can get the results simply by browse the transient signal of it.

 

[eejli]

I know but I need a accurate number like 1 degree's mismatch.

 

[rfsystem]

Yes, indeed the zero crossing is missing some accuracy. I think spectre could be forced to set a time step exact at the zero crossing of I and Q signal. But there is another method.

Take the FFT or in the case of cadence calculator DFT of the I and the Q signal. The calculate the difference of the argument of the complex number result of the fundamental tone. That represent nearly the phase mismatch effect found in the I/Q signals.

Be aware that if the target is a mixer apllication the amplitude sensitivity is less than the phase sensitivity.