A quadrature phase shifter has been implemented in a 0.25 μm SiGe BiCMOS technology. The phase shifter core consists of a novel high resolution (2 x 5 bit) direct digitally controlled dual-path programmable gain amplifier driving a successive two pole passive polyphase filter. Since this core is a fully differential device, on-chip baluns have been employed to decrease the number of off-chip components to the minimum. Multi-tanh g m stages are employed to increase linearity. The circuit features 50 Ω-compatible single-ended in-and outputs and a full 360 o phase shifting range.To the author's knowing, the presented phase shifter is the first to be designed for commercial S-band (2.9 GHz ... 3.1 GHz) shipborne radar systems as specified in IEC standard 62388. It generates 1024 equally distributed phase/amplitude states with a maximum relative deviation of below 2%. Therefore, the circuit is a suitable solution for cost-sensitive phased array applications with high precision requirements.
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