用于无线应用的低功率高频谱纯度频率平移环路

M. Margarit, M. Deen
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引用次数: 6

摘要

在采用恒包络调制技术的通信系统中,带混频器的锁相环可以完成上转换功能。这些环路,通常被称为频率转换环路(FTL),执行调制信号从中频到发射机频率的上转换。在便携式无线通信应用中使用的频率平移环路,例如蜂窝电话,需要达到低相位噪声和杂散水平。本文设计了一种工作在中频100 ~ 450 MHz和900 ~ 1.9 GHz频率范围内的单片超光速激光器。与900 MHz载波相比,在400 kHz偏置时输出相位噪声电平为-120 dBc/Hz,在20 MHz偏置时为165 dBc/Hz,杂散电平低于载波的60 dB。这些特性使FTL适用于GSM/DCS等蜂窝电话应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A low power high spectral purity frequency translational loop for wireless applications
PLLs with a mixer in the loop can perform the up-conversion function in communication systems which use constant envelope modulation techniques. These loops, usually named Frequency Translational Loops (FTL), perform the up-conversion of the modulated signal from an intermediate frequency to the transmitter frequency. Frequency translational loops used in portable wireless communications applications, such as cellular telephony, are required to achieve low phase noise and spurious levels. This paper presents the design of a monolithic FTL which operates in the IF frequency range from 100 MHz to 450 MHz and the frequency range from 900 MHz to 1.9 GHz. The output phase noise level is -120 dBc/Hz at 400 kHz offset and 165 dBc/Hz at 20 MHz offset from a 900 MHz carrier and the spurious levels are lower than 60 dB below the carrier. These characteristics make the FTL suitable for use in cellular telephony applications such as GSM/DCS.
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