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https://designers-guide.org/forum/YaBB.pl Design >> Mixed-Signal Design >> PNoise and Pxf simulations https://designers-guide.org/forum/YaBB.pl?num=1191013313 Message started by mandar999 on Sep 28th, 2007, 2:01pm |
Title: PNoise and Pxf simulations Post by mandar999 on Sep 28th, 2007, 2:01pm Hi, I am designing a receiver and need to find out total output noise in the bandwidth of interest. The structure of the receiver is as given below, - Gm-Stage - Passive mixer for downconversion (LO - 1.1GHz, BW - 1GHz) - Active integrator structure to provide built in sinc anti-aliasing filter - the integrating caps are discharge after a certain time window. no feedback resistor. - two integrators working in different phases and interleaved output I am having certain problems while doing Pxf and Pnoise simulations, (1) Without the mixer, I do get the expected sinc response in Pxf analyis with the appropriate DC gain. When I put the mixer, there is a lot of attenuation in the gain. (2) There is a peak in the PNoise analysis, output noise plot at 1GHz Please help me in regards to this issue. [b][/b] |
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