Hittite has introduced three new I/Q down-converters designed for military radar, EW, satellite communications, point-to-point, and point-to-multipoint radio applications between 9 and 24 GHz. The HMC869LC5 and HMC908LC5 are GaAs MMIC devices comprised of an LNA followed by an image reject mixer which is driven by an LO buffer amplifier. The HMC869LC5 covers the 12–16 GHz frequency band while the HMC908LC5 covers the 9–12 GHz frequency band. Small signal gain is as high as 14 dB with 32 dB of image rejection and LO to RF isolation better than 45 dB. The HMC904LC5 is a subharmonic down-converter which includes an LNA followed by an image reject mixer which is driven by an active x2 multiplier. The image reject mixer topology used in all three mixers eliminates the need for a filter following the LNA and removes thermal noise at the image frequency.
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