A ΔΣ fractional-N synthesizer with customized noise shaping for WCDMA/HSDPA applications
- Resource Type
- Conference
- Authors
- Yu, Xueyi; Sun, Yuanfeng; Rhee, Woogeun; Wang, Zhihua; Hyung Ki Ahn; Park, Byeong-Ha
- Source
- 2008 IEEE Custom Integrated Circuits Conference Custom Integrated Circuits Conference, 2008. CICC 2008. IEEE. :753-756 Sep, 2008
- Subject
- Components, Circuits, Devices and Systems
Engineered Materials, Dielectrics and Plasmas
Multiaccess communication
Synthesizers
Noise shaping
Finite impulse response filter
Radio frequency
Phase noise
Quantization
Noise reduction
Filtering
Prototypes
- Language
- ISSN
- 0886-5930
2152-3630
This paper describes a quantization noise reduction method in ΔΣ 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 180nm 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.