A DeltaSigma Fractional-N Synthesizer With Customized Noise Shaping for WCDMA/HSDPA Applications

This paper describes a quantization noise reduction method in DeltaSigma fractional-N synthesizer design based on a semidigital approach. By employing a phase shifting technique, a low power hybrid finite impulse response (FIR) filtering is realized which is suitable for RF applications. Combined wi...

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Bibliographic Details
Published in:IEEE journal of solid-state circuits 2009-01, Vol.44 (8)
Main Authors: Yu, Xueyi, Sun, Yuanfeng, Rhee, Woogeun, Ahn, Hyung Ki, Park, Byeong-Ha, Wang, Zhihua
Format: Article
Language:English
Subjects:
CMOS
Filtering
Filtration
Impulse response
Modulators
Noise
Radio frequencies
Synthesizers
Online Access:Get full text
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Summary:This paper describes a quantization noise reduction method in DeltaSigma fractional-N synthesizer design based on a semidigital approach. By employing a phase shifting technique, a low power hybrid finite impulse response (FIR) filtering is realized which is suitable for RF applications. Combined with the hybrid FIR filtering, single-loop topology makes 4th-order and 5th-order DeltaSigma modulators possible for the type-2 4th-order PLL. A prototype fractional-N synthesizer is implemented in 180 nm CMOS for WCDMA/HSDPA applications. Experimental results show that the proposed method can effectively suppress out-of-band phase noise to meet the phase noise mask requirements in various RF applications.
ISSN:0018-9200
DOI:10.1109/JSSC.2009.2022301