A ΔΣ 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. A prototype...

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Bibliographic Details
Main Authors: Xueyi Yu, Yuanfeng Sun, Woogeun Rhee, Zhihua Wang, Hyung Ki Ahn, Byeong-Ha Park
Format: Conference Proceeding
Language:English
Subjects:
Filtering
Finite impulse response filter
Multiaccess communication
Noise reduction
Noise shaping
Phase noise
Prototypes
Quantization
Radio frequency
Synthesizers
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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. 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:0886-5930
2152-3630
DOI:10.1109/CICC.2008.4672196