Design of an Error Output Feedback Digital Delta Sigma Modulator with In–Stage Dithering for Spur–Free Output Spectrum
| Autor: | Mehr e Munir, Khalid Mahmood, Sohail Imran Saeed |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Frequency synthesizer General Computer Science Computer science 020208 electrical & electronic engineering 02 engineering and technology Delta-sigma modulation 01 natural sciences Noise shaping Compensation (engineering) Phase-locked loop Control theory Modulation 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Dither |
| Zdroj: | International Journal of Advanced Computer Science and Applications. 9 |
| ISSN: | 2156-5570 2158-107X |
| Popis: | Digital Delta Sigma Modulator (DDSM) is responsible for generation of spurious tones at the output of fractional n frequency synthesizer due their inherent periodicity. This results in an impure output spectrum of frequency synthesizer when they are used to generate the fractional numbers in the divider of Phase Locked Loop (PLL) based frequency synthesizer. This paper presents the design of Error – Output feedback modulator based third order Multi – stage noise Shaping (MASH) structure with lesser hardware and effective error compensation network to break the underlying periodicity of DDSM. The DDSM is also analyzed by using non-shaped, shaped and self – dithering mechanism to achieve a pure output spectrum and reduced quantization noise. |
| Databáze: | OpenAIRE |
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