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IEEE Microwave and Guided Wave Letters
Volume 10 Number 10, October 2000

Ka/Q-Band Doubly Balanced MMIC Mixers with Low LO Power

Page 424.

Abstract:

An InP-based broadband double-balanced mixer was developed having interchangeable RF/LO-ports and covering frequencies from 30 to 45 GHz, with a conversion loss of 12 ± 2 dB at the low LO power of 4 dBm. This broadband characteristic was achieved through the use of side-coupled baluns for both the RF and LO ports. The ring quad-diodes used state-of-the-art super-lattice layers, which provided good control of turn-on voltage and were monolithically integrable with in-house HEMT's and HBT's. The diodes exhibited a very low turn-on voltage of 0.15 V at 1 mA,low series resistance, and high cutoff frequencies.

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