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https://designers-guide.org/forum/YaBB.pl Design >> RF Design >> Measuring Image Rejection of Mixer https://designers-guide.org/forum/YaBB.pl?num=1115749305 Message started by vikas on May 10th, 2005, 11:21am |
Title: Measuring Image Rejection of Mixer Post by vikas on May 10th, 2005, 11:21am Can Anybody tell me how to simulate a dual balanced mixer's image rejection? I mean is there a particular analysis in spectre that calculates it automatically. By the way mixer uses a Poly phase filter architecture to suppress image frequency. Right now i am just taking a Fourier transform of IF output and seeing its magnitude at Image frquency. Somewhere I have read that spectre's FFT function doesn't give you a very accurate results. So let me know if i am doing something wrong or there is a better way to calculate it. Thanks, --Vikas |
Title: Re: Measuring Image Rejection of Mixer Post by Ken Kundert on May 10th, 2005, 8:16pm The best way to measure image rejection is with a PXF analysis. FFT routines are generic, they all provide the same level of accuracy. If someone is having trouble with the accuracy of the FFT results, the problem is not with the FFT, but rather the underlying transient analysis. One needs to follow the guidelines given in my book, www.designers-guide.org/Books/dg-spice/. Using PXF avoids the FFT altogether. -Ken |
Title: Re: Measuring Image Rejection of Mixer Post by vikas on May 10th, 2005, 11:42pm Thanks Ken --Vikas |
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