用于恒环路带宽多模定位系统的分数n合成器

2011 IEEE International Conference of Electron Devices and Solid-State Circuits Pub Date : 2011-12-29 DOI:10.1109/EDSSC.2011.6117626

Yan Feng, Guican Chen

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引用次数: 7

摘要

提出了一种恒环路带宽的分数n频率合成器。该合成器可应用于三种定位系统中七种模式的多模定位接收机。采用改进的电荷泵偏置电流调节方法和VCO(压控振荡器)线性变容器，在7种模式下环路带宽恒定，工作稳定。仿真结果表明，该合成器满足高性能接收机的要求。对于每种模式，带内和带外相位噪声分别不大于•95dBC/Hz和•119dBC/Hz@1MHz。7种模态下归一化IcpKvco/wvco的变化范围在•8% ~ 7%之间。凝固时间小于21µs。在1.8V电压下，总功耗为15.34mW。

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A fractional-N synthesizer for multi-mode positioning system with constant loop bandwidth

A fractional-N frequency synthesizer with constant loop bandwidth is presented. This synthesizer can be applied to the multi-mode positioning receiver with seven modes in three positioning systems. In all seven modes it has constant loop bandwidth and can work stably by using the improved adjusting method in charge pump biasing current and the linear varactor in VCO (voltage-controlled oscillator). Simulations show that this synthesizer meets the requirements of high performance receiver. For each mode, the in-band and out-of-band phase noises are not lager than •95dBC/Hz and •119dBC/Hz@1MHz, respectively. The variation of normalized IcpKvco/wvco in seven modes is in the range of •8% and 7%. The setting time is less than 21µs. The total power consumption is 15.34mW at 1.8V voltage supply.

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2011 IEEE International Conference of Electron Devices and Solid-State Circuits

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