Abstract: This article presents an optional diplex filter, consisting of only five chip capacitors and two chip inductors, that is designed for use with the MAX3580 direct-conversion DVB-T tuner. The second-order intercept point (IIP2) is improved by at least 25dB at the cost of not more than 0.8dB of noise-figure degradation. To make this improvement, the diplex filter provides typical isolations of 15dB from UHF channels when tuned to a VHF channel, and better than 32dB from VHF channels when tuned to a UHF channel.
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