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Given figure shows first stage of a super heterodyne receiver. The desired input signal is at a frequency of 700 MHz. The L.O. frequency is 1 GHz. The mixer is an ideal multiplier with a gain independent of frequency. A band pass filter (BPF) is used to select Intermediate frequency (IF) output at 300 MHz.
If a LPF can be used before the mixer to reject image frequency obtained, then for a perfect rejection (zero transmission) of the image desired, LPF employed with