GaAs MMIC mixers boost dynamic range in radar and RF communications applications

October 06, 2017 // By Jean-Pierre Joosting
Custom MMIC has announced three GaAs MMIC mixers for C-band, X-band, K-band, and Ka-band applications.

The CMD251C3 fundamental mixer, CMD252C4 I/Q mixer, and CMD180 fundamental mixer deliver best-in-class isolation and conversion loss performance while offering low input power requirements. These latest MMIC mixers help increase dynamic range while reducing LO power and subsequent filtering requirements. They are ideal for high-performance commercial, military, aerospace, and satcom applications.

The CMD251C3 is a general purpose, fundamental double-balanced MMIC mixer in a 3- x 3- mm leadless surface mount package that can be used for up- and down-converting applications between 4 and 8.5 GHz (C-band). This fundamental mixer exhibits high LO to RF and LO to IF isolation of 36 dB due to optimized balun structures, and can operate with an LO drive level as low as +15 dBm. This GaAs mixer also demonstrates a wide IF bandwidth of DC to 2.2 GHz and a very low conversion loss of only 7 dB.

The CMD252C4 is a 4 GHz to 8 GHz (C-band) compact I/Q MMIC mixer in a 4- x 4-mm leadless surface mount package. This fundamental mixer is comprised of two double-balanced mixer cells and a 90 degree hybrid. An external IF hybrid is needed to complete the image rejection of 30 dB, but this combination is a much smaller alternative to higher cost hybrid image reject mixers and single-sideband upconverter assemblies. The CMD252C4 also features a wide IF bandwidth of DC to 2.4 GHz with a low IRM conversion loss of only 6.5 dB.