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The input/output terminals of a mixer are identified as RF, LO and IF. In most
passive double balanced mixers, the LO and RF ports are either transformer or
transmission line-coupled to the mixer diodes, and therefore have a limited
low-frequency response, while the IF port is usually direct-coupled with an
essentially unlimited low frequency response. In upconverting applications, the
low frequency input signal is often applied to the IF port of a passive mixer with
the higher-frequency output signal being taken from the RF port. (Active
mixers of the IAM product family require that the input port be the RF port and
the output port be the IF port even in upconverting applications.)
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