Quadrature Broadband Phase Shift Generation Using Passive RC Polyphase Filter for RF Front-end

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Conference Proceeding
Proceedings of the 2016 16th International Symposium on Communications and Information Technologies (ISCIT), 2016, pp. 507 - 601
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This paper reviews the state of the art of a polyphase complex filter for RF front-end low-IF transceivers applications. We then propose a multi-stage polyphase filter design to generate a quadrature I/Q signal to achieve a wideband precision quadrature phase shift with a constant 90 ° phase difference for self-interference cancellation circuit for full duplex radio. The number of the stages determines the bandwidth requirement of the channel. An increase of 87% in bandwidth is attained when our design is implemented in multi-stage from 2 to an extended 6 stages. A 4-stage polyphase filter achieves 2.3 GHz bandwidth.
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