Design of a C-Band Image Reject Mixer as a GaAs MMIC

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  • Author: John E. Penn
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.