A fully integrated dual-mode frequency synthesizer for GSM and Wideband CDMA in 0.5/spl mu/m CMOS

Y. Tang, A. Aktas, M. Ismail, S. Bibyk
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引用次数: 17

Abstract

A fully integrated dual-mode frequency synthesizer for GSM and Wideband CDMA (WCDMA) is presented. The synthesizer is designed to maximize hardware sharing between the two modes by applying fractional frequency synthesis to GSM mode and integer frequency synthesis to WCDMA mode. The shared components include phase frequency detector (PFD), charge pump (CP), loop filter, integer frequency divider and VCO, which is 70% of the entire synthesizer in term of die area. A high-speed low power dual modulus prescaler is proposed to operate up to 2.1GHz at 3.3V supply voltage with 11.6mW power consumption by simulation. A dual mode VCO is also proposed for the enhanced tuning range with an accumulation mode NMOS varactor for band-to-band tuning and a p/sup +/n junction varactor for in-band tuning. The simulation result shows that the synthesizer phase noise is -112dBc/Hz at 600kHz offset frequency for WCDMA mode and -117 dBc/Hz for GSM mode.
一种完全集成的双模频率合成器,用于GSM和宽带CDMA在0.5/spl μ m CMOS
提出了一种用于GSM和宽带CDMA (WCDMA)的全集成双模频率合成器。该合成器通过将分数频率合成应用于GSM模式和将整数频率合成应用于WCDMA模式来最大限度地实现两种模式之间的硬件共享。共用元件包括相频检测器(PFD)、电荷泵(CP)、环路滤波器、整数分频器和压控振荡器,占整个合成器模具面积的70%。通过仿真,提出了一种高速低功耗双模预分频器,在3.3V供电电压下工作频率高达2.1GHz,功耗为11.6mW。为了提高调谐范围,还提出了一种双模压控振荡器,其中累加模式NMOS变容管用于带间调谐,p/sup +/n结变容管用于带内调谐。仿真结果表明,在600kHz偏置频率下,WCDMA模式合成器相位噪声为-112dBc/Hz, GSM模式合成器相位噪声为-117 dBc/Hz。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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