Design of a C-Band Image Reject Mixer as a GaAs MMIC
High Frequency Electronics, U.S. Army Research Laboratory
As in many engineering decisions there is the tradeoff between simple and straightforward versus complex but higher performance. In many radio frequency (RF) systems a desired signal is down-converted to a lower frequency then converted to digital signals with an analog-to-digital converter for further processing. One tradeoff is the bandwidth and frequency of this conversion. A higher bandwidth or higher intermediate frequency requires a higher speed A/D converter and higher power consumption. In this article, an example of a diode based image reject mixer at C-Band is described along with a discussion of some of the performance tradeoffs in deciding on an appropriate intermediate frequency.
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