A Small-Insertion-Loss-Variation Phase Shifter with Optimized Body-Floating Transistors
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© 2015 EuMA. Body-floating technique applied to n-type metal-oxide-semiconductor (nMOS) transistors and transistor-size optimization are studied for minimizing the insertion-loss variation in phase shifters. A CMOS radio frequency integrated circuit (RFIC) 4-bit digital phase shifter designed using a 0.18-μm SiGe BiCMOS technology with low insertion-loss variation between phase states is designed to verify the concepts. The phase shifter shows a measured insertion-loss variation of 13 ± 2.5 dB across different phase states at 24 GHz and an input/output return loss better than 10 dB over 21 to 27 GHz.
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