The use of a fully balanced mixer as an RF attenuator. By injecting a current into the IF port (mixer output port), one of the RF ports can be made to "leak" its signal to the other RF port. The degree of leakage (or isolation) can be controlled by changing the DC current into the IF port. This video goes into the theory, experimental and simulation results of this technique.
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Fully balanced RF mixers as attenuators
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