Abstract
This letter presents a tunable phase shifter implemented in a 0.18-μm CMOS process for monolithic microwave integrated circuit (MMIC) applications. By employing active inductors in the synthetic transmission line architecture, the phase shifter exhibits a wide phase control range, low insertion loss, and miniaturized chip area. Characterized by the S-parameter measurement, the fabricated circuit demonstrates an insertion loss less than 1.1dB within the 360/spl deg/ phase shift while maintaining a return loss better than 10dB from 3.5 to 4.5GHz. Due to the absence of distributed elements and spiral inductors, the area of the phase shifter core is 400×200μm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> . To the authors' best knowledge, this is the smallest chip size ever reported for an analog phase shifter at this frequency band."
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