A 36mW/9mW Power-Scalable DCO in 55nm CMOS for GSM/WCDMA Frequency Synthesizers

📋 论文概要

该论文提出了一种在55nm CMOS工艺中实现的功耗可缩放数字控制振荡器(DCO)，用于GSM/WCDMA频率合成器。通过功耗缩放技术，该DCO能够在36mW和9mW之间切换，同时支持两种不同的通信标准，解决了多模射频前端中振荡器功耗与频段兼容性的问题。

💡 主要创新点

• 提出了可动态切换功耗模式的DCO架构，在36mW和9mW两种功耗状态下分别满足WCDMA和GSM的相位噪声要求，实现功率按需缩放。
• 在55nm CMOS工艺中集成了覆盖GSM和WCDMA频段的调谐技术，无需额外外部元件，减小了面积和成本。

🏷 关键词

📄 原文摘要

Lund University, Lund, Sweden 1 2 The RF front-ends of modern smart phones are becoming more complicated as newer standards are introduced (e.g. LTE). Reconfigurability can be used to reduce their size, provided that power consumption is not adversely affected. For 2G/3G transceivers, local oscillator (LO) generation requires significant area and power. Reconfigurable voltage-controlled oscillators (VCOs) are generally used to maximize the achievable tuning range to reduce their number in the presence of many supported bands. However, no VCO capable to support both WCDMA and GSM has been reported that is also competitive with the power consumption achieved using two separate oscillators. In fact, the very demanding GSM phase-noise specs require a current up to four times higher (depending on the duplexer selectivity) than that used in the WCDMA case. In the design of an LCtank harmonic oscillator, phase noise normalized to power consumption (i.e. the

👥 作者与机构

Antonio Liscidini1, Luca Fanori1, Pietro Andreani2, Rinaldo Castello1

University of Pavia, Pavia, Italy