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首页> 外文期刊>IEEE Journal of Solid-State Circuits >A 2.4-GHz monolithic fractional-N frequency synthesizer with robust phase-switching prescaler and loop capacitance multiplier
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A 2.4-GHz monolithic fractional-N frequency synthesizer with robust phase-switching prescaler and loop capacitance multiplier

机译:具有强大的相位切换预分频器和环路电容乘法器的2.4GHz单片分数N频率合成器

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摘要

The design of a 2.4-GHz fully integrated /spl Sigma//spl Delta/ fractional-N frequency synthesizer in a 0.35-/spl mu/m CMOS process is presented. The design focuses on the prescaler and the loop filter, which are often the speed and the integration bottlenecks of the phase-locked loop (PLL), respectively. A 1.5-V 3-mW inherently glitch-free phase-switching prescaler is proposed. It is based on eight lower frequency 45/spl deg/-spaced phases and a reversed phase-switching sequence. The large integrating capacitor in the loop filter was integrated on chip via a simple capacitance multiplier that saves silicon area, consumes only 0.2 mW, and introduces negligible noise. The synthesizer has a 9.4% frequency tuning range from 2.23 to 2.45 GHz. It dissipates 16 mW and takes an active area of 0.35 mm/sup 2/ excluding the 0.5-mm/sup 2/ digital /spl Sigma//spl Delta/ modulator.
机译:提出了在0.35- / spl mu / m CMOS工艺中实现2.4 GHz完全集成的/ spl Sigma // spl Delta / N分数频率合成器的设计。该设计着重于预分频器和环路滤波器,它们通常分别是锁相环(PLL)的速度和集成瓶颈。提出了一种1.5V 3-mW本质上无干扰的相位切换预分频器。它基于八个较低的频率45 / spl deg /-隔开的相位和一个反相切换序列。环路滤波器中的大型积分电容器通过一个简单的电容倍增器集成在芯片上,该电容倍增器节省了硅片面积,仅消耗0.2 mW的功率,并且噪声可忽略不计。该合成器的频率调谐范围为9.4%,范围为2.23至2.45 GHz。它耗散16 mW,有效面积为0.35 mm / sup 2 /,不包括0.5 mm / sup 2 /数字/ spl Sigma // spl Delta /调制器。

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