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PSS, PAC and other harmonic balance simulations of a receiver in cadence

gurusub

 I need to simulate an entire receiver front end with BPF and VCO. I am not sure how to perform PSS and PAC and other harmonic balance analyses without the LO port for the mixer. As you may remember while running PSS we generally find the steady state response by specifying the LO port to be the Large signal but such a port does not exist as I am using a VCO. Can you please respond with simulation setups or point me to a dcoument that would contain the same?

 

Thanks,

 

Guru

Parents

  •  Thank you Andrew. Your reply made a lot of sense.

    I have another question about the output I get from my VCO. It is about the different results I get from different analyses. My goal is to design a VCO operating at 2.45GHz. When I do a transient and use the frequency function in the calculator I get a freq value almost equal to 2.45 GHz. On the other hand if I do a PSS (with the oscillator box checked) and calculate the harmonic frequency I get 2.47GHz. There is a discrepancy of about 20MHz which makes a lot of difference when it comes to desigining a direct conversion/ Low-IF receiver. Which result do you think is more reliable ? The one from the calculator (2.45GHz) or the one from PSS (2.47GHz).

    Thanks,

    Guru

     

     

     

Reply

  •  Thank you Andrew. Your reply made a lot of sense.

    I have another question about the output I get from my VCO. It is about the different results I get from different analyses. My goal is to design a VCO operating at 2.45GHz. When I do a transient and use the frequency function in the calculator I get a freq value almost equal to 2.45 GHz. On the other hand if I do a PSS (with the oscillator box checked) and calculate the harmonic frequency I get 2.47GHz. There is a discrepancy of about 20MHz which makes a lot of difference when it comes to desigining a direct conversion/ Low-IF receiver. Which result do you think is more reliable ? The one from the calculator (2.45GHz) or the one from PSS (2.47GHz).

    Thanks,

    Guru

     

     

     

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