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An all-digital sigma-delta modulator (SDM) based RF synthesizer is presented. A multiplier-less architecture for the implementation of the band-pass SDM loop filter is proposed. Furthermore, this architecture enables the adjustment of the loop filter central frequency by exploiting homodyne up- and down-conversion. The RF synthesizer is comprised of a direct digital synthesizer (DDS) and the proposed...
Band-pass sigma-delta modulators (SDMs) can be used for all-digital frequency synthesis with low noise in the SDM passband. To avoid mixed-signal components such as DACs, a single-bit output is required. The noise shaping characteristics of single-bit sigma-delta modulators are limited by stability requirements. Look-ahead SDMs have been proposed to increase the bandwidth and signal-to-noise-and-distortion...
All-digital frequency synthesis using two low-pass single-bit Multi-Step Look-Ahead sigma-delta modultors (MSLA SDMs) is presented. MSLA SDMs provide better noise shaping characteristics, i.e. SNDR and bandwidth, than conventional SDMs at the cost of higher hardware complexity. The balance between complexity and performance is adjusted by the number of look-ahead steps, which is an additional design...
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