A 28.5 GHz monolithic cascode LNA with 70GHz f/sub T/ SiGe HBTs

This paper presents the design and experimental results of a monolithic cascode LNA for 28.5GHz applications using SiGe HBTs. It shows that designing circuits at frequencies beyond f/sub T//3 is possible. The best experimental results are obtained at 26GHz with a 3.3V supply voltage: |S/sub 21/| = 10.4dB, input and output matching better than -10dB. The measured noise figure is 6.4dB.

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