I am trying to model the input impedance of a passive mixer. input impedance of mixer is time varying impedance therefore, correct analysis should be done in time domain to measure it. AC analysis is a way but it will not yield a correct model for it.
What I am doing is, I am applying LO and applying a small amplitude sin wave.
However I can not find a way to get impedance! If someone do it so, can you help me?
You can evaluate impedance averaged over one period of Local signal by invoking master steady state analysis using one tone large signal followed by slave small signal analysis.
Mixers are nonlinear blocks and that's why small signal analysis are not valid including AC and s-parametrs..
Instead, a HB analysis by putting current meter can give you the input impedance of a mixer.
Or transisent simulation will also give but I prefer to use HB..
Mixers are nonlinear blocks and that's why small signal analysis are not valid including AC and s-parametrs..
Instead, a HB analysis by putting current meter can give you the input impedance of a mixer.
Or transisent simulation will also give but I prefer to use HB..
I am trying to model the input impedance of a passive mixer. input impedance of mixer is time varying impedance therefore, correct analysis should be done in time domain to measure it. AC analysis is a way but it will not yield a correct model for it.
What I am doing is, I am applying LO and applying a small amplitude sin wave.
However I can not find a way to get impedance! If someone do it so, can you help me?
You should know that : two types of circuits produce harmonics: 1.nonlinear circuits and 2. linear time variant circuits.
Interestingly, people always had discussion about Mixer: Should we call it nonlinear or linear time variant system. Depending on how you look at the mixer, you can call it nonlinear or linear time variant system.
I recommend you to read the first pages of RF Microelectronics by BEHZAD RAZAVI to clarify this.