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Some electronic devices (usable as general purpose switches) can be used for HF up to 30 MHz as high dynamic mixer, these devices are low cost components but it is possible to obtain high dynamic mixers. These components are FETs in quadruple configuration used as switches called 4 Bit Bus Switch, or quadruple logical ports used as switches too. Both are always driven by a C-MOS logical port on low level LO signal. We will not dwell on the explanation of these mixers (see internet or magazines) the cost of these components is very low because they were developed for consumer market. The "trick" lies in selecting devices that, among all the many available products, have low parasitic capacitance, fast switching times and very low RDS series resistance.