Design of an original K-band active balun with improved broadband balanced behavior | IEEE Journals & Magazine | IEEE Xplore

Design of an original K-band active balun with improved broadband balanced behavior


Abstract:

This letter deals with the design of an active balun exhibiting a single-ended input and balanced outputs. We propose an original method, based on the determination of sp...Show More

Abstract:

This letter deals with the design of an active balun exhibiting a single-ended input and balanced outputs. We propose an original method, based on the determination of specific impedance for connecting the differential transistor pair to ground, which greatly improves the balanced behavior over a broadband frequency range. The usefulness of this method is demonstrated through a 180/spl deg/ power divider implemented on a 0.25-μm SiGe BiCMOS process. According to simulations, measurements confirm a broadband well balanced behavior, since the power splitter exhibits phase and amplitude errors between the two channels less than 4/spl deg/ and 0.5dB, respectively, from 0.2 to 22 GHz. These errors are only 0.75/spl deg//0.03 dB in a 2-GHz span around 20 GHz, in accordance with our optimization goals.
Published in: IEEE Microwave and Wireless Components Letters ( Volume: 15, Issue: 4, April 2005)
Page(s): 280 - 282
Date of Publication: 11 April 2005

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