InP DHBT 68 GHz frequency divider

We report a 68 GHz 2:1 frequency divider with measured input sensitivity less than 6 dBm from 53-68 GHz. To our knowledge, this is the fastest digital frequency divider reported to date in any semiconductor technology. The divider is implemented in differential current mode logic (CML) using undercut collector InP Double Heterojunction Bipolar Transistor (DHBT) technology, with measured f/sub T/ of 150 GHz and f/sub max/ of 163 GHz at J/sub x/=1.2/spl times/10/sup 5/ A/cm/sup 2/. It draws 25.1 mA from a single -3 V supply, dissipating 75 mW. Test results were obtained for wafer probe using micro-coax probes.

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