Delta-Sigma Modulation Techniques in All-Digital Transmitter Design
Summary
The use of Delta-Sigma modulation in fully digital transmitter architectures has emerged as a versatile means of achieving high spectral purity and wideband agility without reliance on analogue mixers or filters. By applying oversampling and noise-shaping principles within discrete-time feedback loops, designers can concentrate quantisation noise outside the signal band and thus realise digital-to-RF conversion that meets stringent linearity and adjacent-channel leakage requirements. Modern implementations exploit high-order modulators, multi-bit quantisers and reconfigurable loop filters to tailor performance across diverse applications from 5G modems to low-power Internet-of-Things transceivers. Key challenges remain in the control of loop stability, the suppression of spurious tones arising from finite-precision arithmetic and the integration of digital predistortion techniques to compensate for non-idealities in on-chip power amplifiers. Recent architectural innovations have further embraced bandpass noise shaping, digital phase-locked loops and envelope tracking, underscoring the global shift towards all-digital front ends in next-generation wireless systems.
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Delta-Sigma Modulation Techniques in All-Digital Transmitter Design publication trend
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Technical terms
All-digital transmitter: A radio front end in which frequency conversion, filtering and modulation are performed entirely in the digital domain, reducing analogue hardware.
Delta-Sigma modulation: A technique that oversamples an input signal and uses a feedback loop to shape quantisation noise, pushing it out of the signal band.
Noise shaping: The deliberate redistribution of quantisation noise in frequency so that noise density is minimised within the band of interest and increased elsewhere.
Quantisation noise: The error introduced when continuous signal amplitudes are represented by a finite set of digital levels.
Oversampling: Sampling a signal at a rate significantly higher than twice its highest frequency component to facilitate noise shaping and relax filter requirements.
References
- Bandpass Sigma–Delta Modulation: The Path toward RF-to-Digital Conversion in Software-Defined Radio. Chips (2023).
- Design and Simulation of Sigma-Delta Fractional-N Frequency Synthesizer for WiMAX. Engineering and Technology Journal (2008).
- NDM: 1-Bit Delta-Sigma Converter with Non-Linear Loop. MATEC Web of Conferences (2019).
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