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Floating Vpulse Influence Simulation Result

Went

Hello

I get confused recently. I am simulating a DCR (Direct conversion receiver) to get the output DC term caused by second order non-linearity of it. And I find a weird phenomenon, that is the vpulse can influence the simulaition result even if it only connects to ground. I change the frequency of it, and the simulation results changed. Is it a BUG? or something impossible?

Did anybody meet situation like this?

thanks

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  • Dear Went,

    Speaking for myself, I can't provide any definite insight into what you are observing as there is not anywhere enough information on your circuit. I understand your question, but there are multiple sources of DC offsets in a direct conversion receiver and there is not enough information about your circuit and your inputs (not only the"pulse" you mention). For example, you can get mixing between the RF and LO ports if the isolation is not sufficiently high that is a source of DC offsets. In your case, if your increased amplitude refers to a signal applied to the RF or LF port input, the added amplifier may result in enough coupling to change the DC offset.

    Shawn

  • in reply to ShawnLogan

    This is my circuit. I used vcvs to model VGA, its' output is above 100 V. while the difference between the two branch is less than one hundred millivolts. 

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