An innovative vector-sum phase shifter with a full 360 variable phase-shift range in 0.18-m CMOS technology is proposed and experimentally demonstrated in this paper. It employs an I/Q network with high I/Q accuracy over a wide bandwidth to generate two quadrature basis vector differential signals. The fabricated chip operates in the 2.3-4.8 GHz range. The root-mean-square gain error and phase error are less than 1.1 dB and 1.4 over the measured frequency span, respectively. The total current consumption is 10.6 mA (phase shifter core: 2.6 mA) from a 1.8 V supply voltage and overall chip size is 0.87 0.75 mm . To the best of the authors' knowledge, this circuit is the first demonstration of microwave CMOS phase shifter with very low phase error over a wide bandwidth employing the vector sum method for all monolithic microwave integrated circuit phase shifters with 360 phase-control range to date.Index Terms-Active phase-shifter, CMOS analog integrated circuit, differential amplifier, I/Q network, phased array.
This paper presents the design of a 6-bit active digital phase shifter in 0.18-μm CMOS technology. The active phase shifter synthesizes the required phase using a phase interpolation process by adding quadrature phased input signals. It uses a new quadrature all-pass filter for quadrature signaling with a wide bandwidth and low phase error. The phase shifter has simulated RMS phase error of <0.85 • at 2.4-5 GHz. The average voltage gain ranges from 1.7 dB at 2.4 GHz to −0.14 dB at 5 GHz. Input P1 dB is typically 1.3±0.9 dBm at 3.5 GHz for overall phase states.
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