Referenced Items are not available for this document.
A ΣΔ-driven RF switch-mode power amplifier is inherently linear only when it has a two-level output. At the same time, a two-level output generates the largest amount of quantization noise. This brief analyzes the effect of nonequal level spacing in a three-level ΣΔ output and provides a method for shaping the corresponding error noise to regions outside the band of interest. Subsequently, the nonlinearity-shaping property is utilized to obtain an improved two-level drive signal based on three-level ΣΔ modulation. The new binary drive signal is proven to have better adjacent channel leakage ratio and higher coding efficiency than a conventional two-level ΣΔ modulator. In the investigated case, measured coding efficiency improves from 8.9% of the conventional two-level modulator to 21% of the modified two-level modulator.
Published in:
Circuits and Systems II: Express Briefs, IEEE Transactions on
(Volume:59
,
Issue:
10
)
Date of Publication: Oct. 2012
- Page(s):
- 618 - 622
- ISSN :
- 1549-7747
- INSPEC Accession Number:
- 13039023
- Digital Object Identifier :
- 10.1109/TCSII.2012.2213432
- Product Type:
- Journals & Magazines
- Date of Publication :
- 14 September 2012
- Date of Current Version :
- 12 October 2012
- Issue Date :
- Oct. 2012
- Sponsored by :
- IEEE Circuits and Systems Society
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