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Analysis and Design of RC Polyphase Network for Quadrature Signal Generation in the 2.45GHz ISM Band

This paper presents a detailed analysis of the RC polyphase network. A new approach based on very basic principles is used to derive the transfer functions of the RC polyphase network when it is used for quadrature signal generation. The 0deg-phase and 90deg-phase signals' mismatch is described quantitively in this paper. A quadrature signal generator with a center frequency of 2.45 GHz and a bandwidth of 300 MHz has been designed. This designed generator provides 350 mV output swing with 1.95 mW power consumption. The quadrature signals have less than 0.5 dB mismatch in amplitude and less than 0.5deg phase error even with 15% component variation.