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

作者：Yu Xueyi^*; Sun Yuanfeng; Rhee Woogeun; Ahn Hyung Ki; Park Byeong Ha; Wang Zhihua

来源：IEEE Journal of Solid-State Circuits, 2009, 44(8): 2193-2201.

DOI：10.1109/JSSC.2009.2022301

• FIR filtering
• fractional-N
• frequency synthesizer
• integrated circuits
• noise shaping
• phase noise
• PLL
• quantization noise

This paper describes a quantization noise reduction method in Delta Sigma 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 Delta Sigma 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.

• 出版日期2009-8
• 单位清华大学