An extremely compact architecture for a passive 6-bit digital phase shifter is presented. The phase shifter has a range of 360° with 5.6° resolution at 2.4 GHz. The architecture is composed of an ambidextrous quadrant selector in series with a digital fine-tuned phase shifter that makes use of high-ratio symmetrical digitally variable capacitors loading a lumped element transmission line. The phase shifter achieves a 50 Ω match in all 64 states. The circuit occupies approximately 0.47 mm2 on die, and the entire test chip measured 0.84 mm2, including bond pads and ESD structures. The 1-dB compression point was +23 dBm. The chip was fabricated in a commercial 0.13- μm silicon-on-insulator CMOS process.

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Keywords Phase shifter, quadrant selector, varactor, variable capacitors
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Journal IEEE Transactions on Circuits and Systems II: Express Briefs
Cook, M. (Mackenzie), & Rogers, J. (2017). A highly compact 2.4-GHz passive 6-bit phase shifter with ambidextrous quadrant selector. IEEE Transactions on Circuits and Systems II: Express Briefs, 64(2), 131–135. doi:10.1109/TCSII.2016.2551551