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why need low pass filter in image reject mixer (Read 2200 times)

sapphire Community Member Offline Posts: 37	why need low pass filter in image reject mixer May 12^th, 2007, 11:20pm seems like the sum frequency components would also be rejected by the architecture.
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carlgrace Senior Member Offline Posts: 231 Berkeley, CA	Re: why need low pass filter in image reject mixer Reply #1 - Jun 1^st, 2007, 5:29am The image's sum would be rejected but there would be a sum component in the output. Also, the summing circuit would have to be perfectly balanced for there not to be an issue of intermod.
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loose-electron Senior Fellow Offline Best Design Tool = Capable Designers Posts: 1638 San Diego California	Re: why need low pass filter in image reject mixer Reply #2 - Jun 5^th, 2007, 11:29am agree with the above - In an ideal math only world, things can cancel perfectly. In a real world method, there will always be some junk there that was not cancelled out
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