Abstract
Phase shifters [Kou91] are applied for many RF circuits, e.g. in adaptive antenna combiners (refer to Fig. 2.16 and [Ell21, Ell29]), measurement equipment, phase locked loops and PA linearisation systems. On the wish list for phase shifters we can find the following performance constraints: 360° phase shift, low loss or even gain, adequate bandwidth, RF power handling and line arity, low power consumption, and small size. In most cases, phase shifters require inductors consuming lots of circuit area. However, small circuits are favourable concerning costs. The control complexity should be as low as possible. One control signal is preferred. Moreover, the amplitude variations vs phase control should be small. All those constraints make the design of integrated phase shifters to a challenging task. As for other circuits, reasonable tradeoffs have to be found. Both active and passive approaches have been invented to meet the requirements for specific applications. The most common phase shifter approaches including varactor tuned transmission lines, reflective type phase shifters and vector modulators will be elaborated in the next sections.
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(2007). Phase Shifters. In: Radio Frequency Integrated Circuits and Technologies. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-35790-2_14
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DOI: https://doi.org/10.1007/978-3-540-35790-2_14
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