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Definition of "image rejection filter" |
a filter usually placed before a mixer to preselect the frequency, which when “mixed” with the local oscillator frequency, will down-convert to the desired intermediate frequency. In the absence of an image rejection filter, there are two RF frequencies, which when mixed with the local oscillator frequency f(base lo), will downconvert to the intermediate frequency f(base if) . Specifically, these are given by flo Cfif and f(base lo)−f(base if) . |
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