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An efficient architecture for Kalman band-pass sigma-delta (Σ-Δ) demodulator, used in the application of FM demodulation, is presented. The IF stage of the circuit separates the inphase and quadrature (I and Q) signals using a single circuit path, thus eliminating I-Q differences due to component mismatch. The separated I-Q signals are then filtered using an efficient recursive Kalman band-pass filter. The demodulation performance of Kalman filter is evaluated. The FPGA (field programmable gate array) design of the architecture is given.
SOC Conference, 2004. Proceedings. IEEE International
Date of Conference: 12-15 Sept. 2004