论文信息 - A Complex Bandpass ∆ Σ Converter for Digital Radio

A Complex Bandpass ∆ Σ Converter for Digital Radio

A new architecture is proposed for a singlechip digital radio receiver. This architecture has several advantages over the direct conversion architecture that has been gaining interest for use in single-chip designs. A non-zero quadrature IF reduces the image problem and eliminates concerns about self-EMI and 1/f noise. A “complex” bandpass filter embedded in a delta-sigma (∆Σ) loop allows the A/D conversion to be performed directly on the pair of quadrature outputs from the mixer. Simulation results show potential SNR greater than 100dB for an ideal 4th-order complex modulator.

K. W. Martin | A. S. Sedra | W. M. Snelgrove | S. A. Jantzi

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