![]() Let us understand RF Mixer terminologies. ![]() There are specially designed image reject mixers which does the function of removal of these This image frequency need to be filtered out in up conversion. In up-convert mixers, image frequency will be unwanted sideband, which has amplitude at level same as wanted desired signal. In down-convert mixers, image frequency will be converted directly to IF position along with IF frequency itself. ![]() Here image frequency will exist at (f LO+f IF) in frequency spectrum. When LO frequency is higher than RF frequency, then image fequency will be higher Here image frequency will exist at (f LO-f IF) in frequency spectrum. If LO frequency is lower than RF frequency, then image frequency will be This frequency translation process is known as up conversion. It converts lower IF frequency or baseband frequency to a higher IF or RF frequency to provideĮfficient power transmission in the RF transmitter part. This frequency translation process is known as down conversion. It converts RF to lower IF frequency or to baseband to make signal processing easier in the RF receivers. RF mixer device is used in up conversion and down conversion modules of RF Transceiver. Spectral components of the RF mixer are mentioned in the figure-1.Īs shown it produces +/-m(Input1)+/-n(Input2) where in Input1 and Input2 are input frequencies.įigure-1 mentions upto third harmonics of inputs. It is considered a linear device because it keeps the properties of input signal intact while doing frequency translation. It has two input ports and one output port.įor Up frequency conversion, IF and LO are used as input ports and output will be available at RF port.įor down frequency conversion, RF and LO are used as input ports and output will be available at IF port.Īctually it is a non linear device and used for shifting signal from one frequency to the other point in the spectrum. This page of RF tutorial section covers RF mixer tutorial.It covers RF mixer basics, its use in rf circuit design, terminologies,
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